用NetBeans做简易计算器

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package caculator;

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

/**
 *
 * @author Administrator
 */
public class jisuanqi extends javax.swing.JFrame {
    private Object result;
    private Object iTextField11;

    /**
     * Creates new form jisuanqi
     */
    public jisuanqi() {
        initComponents();
    }
     
    public void setNum(String str){
    String strText = new String(jTextField1.getText());
             if(strText.equals("0")){
                 jTextField1.setText(str);
             }else{
                 StringBuffer strBuf = new StringBuffer(strText);
                 strBuf.append(str);
                 jTextField1.setText((strBuf.toString()));
             }
            }
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                         
    private void initComponents() {

        jLayeredPane1 = new javax.swing.JLayeredPane();
        jPanel2 = new javax.swing.JPanel();
        jTextField1 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jButton5 = new javax.swing.JButton();
        jButton6 = new javax.swing.JButton();
        jButton8 = new javax.swing.JButton();
        jButton9 = new javax.swing.JButton();
        jButton10 = new javax.swing.JButton();
        jButton11 = new javax.swing.JButton();
        jButton12 = new javax.swing.JButton();
        jButton13 = new javax.swing.JButton();
        jButton14 = new javax.swing.JButton();
        jButton15 = new javax.swing.JButton();
        jButton16 = new javax.swing.JButton();
        jButton17 = new javax.swing.JButton();
        jButton18 = new javax.swing.JButton();
        jButton19 = new javax.swing.JButton();
        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jPanel2.setOpaque(false);

        jTextField1.setFont(new java.awt.Font("宋体", 0, 24)); // NOI18N
        jTextField1.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        jTextField1.setText("0");

        jButton1.setText("7");
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton1MouseReleased(evt);
            }
        });

        jButton2.setText("2");
        jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton2MouseReleased(evt);
            }
        });

        jButton3.setText("1");
        jButton3.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton3MouseReleased(evt);
            }
        });

        jButton4.setText("0");
        jButton4.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton4MouseReleased(evt);
            }
        });

        jButton5.setText("8");
        jButton5.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton5MouseReleased(evt);
            }
        });

        jButton6.setText("4");
        jButton6.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton6MouseReleased(evt);
            }
        });

        jButton8.setText(".");
        jButton8.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton8MouseReleased(evt);
            }
        });

        jButton9.setText("9");
        jButton9.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton9MouseReleased(evt);
            }
        });

        jButton10.setText("6");
        jButton10.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton10MouseReleased(evt);
            }
        });

        jButton11.setText("3");
        jButton11.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton11MouseReleased(evt);
            }
        });

        jButton12.setText("5");
        jButton12.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton12MouseReleased(evt);
            }
        });

        jButton13.setText("/");
        jButton13.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton13MouseReleased(evt);
            }
        });

        jButton14.setText("*");
        jButton14.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton14MouseReleased(evt);
            }
        });

        jButton15.setText("-");
        jButton15.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton15MouseReleased(evt);
            }
        });

        jButton16.setText("+");
        jButton16.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton16MouseReleased(evt);
            }
        });

        jButton17.setText("←");
        jButton17.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton17MouseReleased(evt);
            }
        });

        jButton18.setText("C");
        jButton18.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton18MouseReleased(evt);
            }
        });

        jButton19.setText("=");
        jButton19.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                jButton19MouseReleased(evt);
            }
        });

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
                .addContainerGap(287, Short.MAX_VALUE)
                .addComponent(jButton17, javax.swing.GroupLayout.PREFERRED_SIZE, 77, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(41, 41, 41))
            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel2Layout.createSequentialGroup()
                    .addGap(29, 29, 29)
                    .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(jPanel2Layout.createSequentialGroup()
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(jPanel2Layout.createSequentialGroup()
                                    .addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 48, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addGap(18, 18, 18)
                                    .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                        .addComponent(jButton12, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)))
                                .addComponent(jButton4, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 116, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGap(9, 9, 9)
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(jPanel2Layout.createSequentialGroup()
                                    .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                        .addComponent(jButton8, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addComponent(jButton11, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE))
                                    .addGap(18, 18, 18)
                                    .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                        .addComponent(jButton15, javax.swing.GroupLayout.PREFERRED_SIZE, 57, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addComponent(jButton16, javax.swing.GroupLayout.PREFERRED_SIZE, 57, javax.swing.GroupLayout.PREFERRED_SIZE)))
                                .addGroup(jPanel2Layout.createSequentialGroup()
                                    .addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addGap(18, 18, 18)
                                    .addComponent(jButton14, javax.swing.GroupLayout.PREFERRED_SIZE, 57, javax.swing.GroupLayout.PREFERRED_SIZE)))
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jButton19, javax.swing.GroupLayout.PREFERRED_SIZE, 77, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jButton18, javax.swing.GroupLayout.PREFERRED_SIZE, 77, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel2Layout.createSequentialGroup()
                                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                                    .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addGap(18, 18, 18)
                                .addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 49, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(10, 10, 10)
                                .addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(18, 18, 18)
                                .addComponent(jButton13, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 341, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addContainerGap(35, Short.MAX_VALUE)))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addGap(116, 116, 116)
                .addComponent(jButton17, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(156, Short.MAX_VALUE))
            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel2Layout.createSequentialGroup()
                    .addGap(23, 23, 23)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 77, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(18, 18, 18)
                    .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(jPanel2Layout.createSequentialGroup()
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jButton13, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                    .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE)))
                            .addGap(7, 7, 7)
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                .addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jButton12, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jButton14, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                .addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jButton11, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jButton15, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(jPanel2Layout.createSequentialGroup()
                                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                    .addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addGroup(jPanel2Layout.createSequentialGroup()
                                    .addGap(6, 6, 6)
                                    .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                        .addComponent(jButton8, javax.swing.GroupLayout.PREFERRED_SIZE, 37, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addComponent(jButton16, javax.swing.GroupLayout.PREFERRED_SIZE, 37, javax.swing.GroupLayout.PREFERRED_SIZE)))))
                        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
                            .addGap(2, 2, 2)
                            .addComponent(jButton18, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(jButton19, javax.swing.GroupLayout.PREFERRED_SIZE, 56, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addContainerGap(35, Short.MAX_VALUE)))
        );

        jPanel1.setOpaque(false);

        jLabel1.setIcon(new javax.swing.ImageIcon("C:\\Users\\Administrator\\Desktop\\IMG_2398.JPG")); // NOI18N
        jLabel1.setMaximumSize(new java.awt.Dimension(405, 310));
        jLabel1.setMinimumSize(new java.awt.Dimension(405, 310));

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 405, javax.swing.GroupLayout.PREFERRED_SIZE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 310, javax.swing.GroupLayout.PREFERRED_SIZE)
        );

        javax.swing.GroupLayout jLayeredPane1Layout = new javax.swing.GroupLayout(jLayeredPane1);
        jLayeredPane1.setLayout(jLayeredPane1Layout);
        jLayeredPane1Layout.setHorizontalGroup(
            jLayeredPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGroup(jLayeredPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jLayeredPane1Layout.createSequentialGroup()
                    .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(0, 0, Short.MAX_VALUE)))
        );
        jLayeredPane1Layout.setVerticalGroup(
            jLayeredPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGroup(jLayeredPane1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jLayeredPane1Layout.createSequentialGroup()
                    .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(0, 1, Short.MAX_VALUE)))
        );
        jLayeredPane1.setLayer(jPanel2, javax.swing.JLayeredPane.DEFAULT_LAYER);
        jLayeredPane1.setLayer(jPanel1, javax.swing.JLayeredPane.DEFAULT_LAYER);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jLayeredPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jLayeredPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
        );

        pack();
    }// </editor-fold>                       

    private void jButton4MouseReleased(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        setNum("0");
    }                                     

    private void jButton3MouseReleased(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        setNum("1");
    }                                     

    private void jButton2MouseReleased(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        setNum("2");
    }                                     

    private void jButton11MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        setNum("3");
    }                                      

    private void jButton6MouseReleased(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        setNum("4");
    }                                     

    private void jButton12MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        setNum("5");
    }                                      

    private void jButton10MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        setNum("6");
    }                                      

    private void jButton1MouseReleased(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        setNum("7");
    }                                     

    private void jButton5MouseReleased(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        setNum("8");
    }                                     

    private void jButton9MouseReleased(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        setNum("9");
    }                                     

    private void jButton13MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        setYSF("/");
    }                                      

    private void jButton14MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        setYSF("*");
    }                                      

    private void jButton15MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        setYSF("-");
    }                                      

    private void jButton16MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        setYSF("+");
    }                                      

    private void jButton8MouseReleased(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
String strText = jTextField1.getText();
        if (strText.equals("0")) {
            jTextField1.setText(strText + ".");
        } else {
            StringBuffer strBuf = new StringBuffer(jTextField1.getText());
//            if(strBuf.length()<2){
//                jTextField.setText(strBuf+".");
//            }else{

            int temp = 0;
            int i = strBuf.length() - 1;
            while (i > strBuf.lastIndexOf("+") && i > strBuf.lastIndexOf("-") && i > strBuf.lastIndexOf("*") && i > strBuf.lastIndexOf("/")) {

                if (strBuf.charAt(i) == '.') {
                    temp = i;
                    break;
                } else {

                    i--;
                    temp = i;
                }
                System.out.print(i);

            }

            //String str = new String(strBuf);
            if (temp == strBuf.lastIndexOf("+") || temp == strBuf.lastIndexOf("-") || temp == strBuf.lastIndexOf("*") || temp == strBuf.lastIndexOf("/") || temp == 0) {
                jTextField1.setText(strBuf.toString() + ".");
                System.out.print(strBuf.lastIndexOf("+"));
            } else {

                jTextField1.setText(strBuf.toString());
                System.out.print(strBuf.lastIndexOf("+"));
                System.out.print(temp);
            }

        }
    }                                     

    private void jButton18MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        jTextField1.setText("0");
    }                                      

    private void jButton17MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        String strText = new String(jTextField1.getText());
        if(strText.length()>1){
            StringBuffer StrBuf = new StringBuffer(strText);
            StrBuf.deleteCharAt(StrBuf.length()-1);
            jTextField1.setText((StrBuf.toString()));
        }else{
            jTextField1.setText(("0"));
        }
    }                                      

    private void jButton19MouseReleased(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine se = manager.getEngineByName("js");
            Double result = null;
        try {
             result = (Double) se.eval("("+jTextField1.getText()+")*1.0");
        } catch (ScriptException ex) {
            Logger.getLogger(jisuanqi.class.getName()).log(Level.SEVERE, null, ex);
             jTextField1.setText("错误,按C重输");
        }
        jTextField1.setText(result.toString());
    }                                      
  public void setYSF(String str){
      //取出当前显示内容放到该字符串strText中
  String strText = jTextField1.getText();
  int lastRight = strText.length()-1;
    char ch = strText.charAt(lastRight);
    //判断strText中的字符串最右边是否为运算符
  if(ch=='+'||ch=='-'||ch=='*'||ch=='/'){
      //替换strText最右边运算符为当前按键str
    String strResult = strText.substring(0, lastRight)+str;
    //strText放回文本框
    jTextField1.setText(strResult);
  }else{
      //追加str
         jTextField1.setText(strText+str);
         //strText放回
  }
  }
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(jisuanqi.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(jisuanqi.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(jisuanqi.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(jisuanqi.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new jisuanqi().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                    
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton10;
    private javax.swing.JButton jButton11;
    private javax.swing.JButton jButton12;
    private javax.swing.JButton jButton13;
    private javax.swing.JButton jButton14;
    private javax.swing.JButton jButton15;
    private javax.swing.JButton jButton16;
    private javax.swing.JButton jButton17;
    private javax.swing.JButton jButton18;
    private javax.swing.JButton jButton19;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JButton jButton5;
    private javax.swing.JButton jButton6;
    private javax.swing.JButton jButton8;
    private javax.swing.JButton jButton9;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLayeredPane jLayeredPane1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration                  

   
}