简单的计算器，包含UI

package test0704;


import java.awt.BorderLayout;
import java.awt.EventQueue;


import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import net.miginfocom.swing.MigLayout;
import java.awt.Color;
import javax.swing.JButton;
import java.awt.Font;
import javax.swing.LayoutStyle.ComponentPlacement;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.ImageIcon;


public class JiSuanQi extends JFrame {


private JPanel contentPane;
private JTextField textField;
private double num=0.0;

//截取运算符前面的数字
public static double addDoubleA(String a){
double num1=Double.parseDouble(a.substring(0, a.indexOf(' ')));
return num1;
}

  //获取运算符到=之间的数值
public static double addDoubleB(String a){
double num2=Double.parseDouble(a.substring(a.lastIndexOf(' '),a.indexOf('=')));
return num2;
}
//获取运算符
public static String addYunSuanFu(String a){
String mark=a.substring(a.indexOf(' '),a.lastIndexOf(' '));
     return mark;
}
       //连续运算方法
public static void lianXu(String a){
if(a.indexOf('+')!=-1|a.indexOf('-')!=-1|a.indexOf('*')!=-1|a.indexOf('/')!=-1){}
}




/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JiSuanQi frame = new JiSuanQi();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}


/**
* Create the frame.
*/
public JiSuanQi() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 305, 431);
contentPane = new JPanel();
contentPane.setBackground(Color.WHITE);
contentPane.setForeground(Color.BLUE);
contentPane.setBorder(new EmptyBorder(5, 0, 20, 7));
setContentPane(contentPane);

JButton btnNewButton = new JButton("6");
btnNewButton.setFont(new Font("黑体", Font.PLAIN, 18));
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "6");
}
});


JButton button = new JButton("5");
button.setFont(new Font("黑体", Font.PLAIN, 18));
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "5");
}
});


JButton button_1 = new JButton("4");
button_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "4");
}
});
button_1.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_2 = new JButton("7");
button_2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "7");
}
});
button_2.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_4 = new JButton("9");
button_4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "9");
}
});
button_4.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_3 = new JButton("8");
button_3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "8");
}
});
button_3.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_5 = new JButton(".");
button_5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + ".");
}
});
button_5.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_7 = new JButton("0");
button_7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "0");
}
});
button_7.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_8 = new JButton("3");
button_8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "3");
}
});
button_8.setFont(new Font("黑体", Font.PLAIN, 18));

JButton btnX = new JButton("2");
btnX.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
textField.setText(textField.getText() + "2");
}
});
btnX.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_10 = new JButton("1");
button_10.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "1");
}
});
button_10.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_11 = new JButton("+");
button_11.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(textField.getText().indexOf(" +")!=-1|
textField.getText().indexOf(" -")!=-1|
textField.getText().indexOf(" *")!=-1|
textField.getText().indexOf(" /")!=-1)
{

}else{textField.setText(textField.getText() + " + ");}
}
});
button_11.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_12 = new JButton("-");
button_12.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + " - ");
}
});
button_12.setFont(new Font("黑体", Font.PLAIN, 18));

JButton btnX_1 = new JButton("X");
btnX_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + " * ");
}
});
btnX_1.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_14 = new JButton("/");
button_14.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + " / ");
}
});
button_14.setFont(new Font("黑体", Font.PLAIN, 18));

JButton btnBackspace = new JButton("Backspace");
btnBackspace.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText("");
}
});
btnBackspace.setFont(new Font("黑体", Font.PLAIN, 14));

JButton button_6 = new JButton("=");
button_6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText() + "=");

double num1=JiSuanQi.addDoubleA(textField.getText());
double num2=JiSuanQi.addDoubleB(textField.getText());
String mark =JiSuanQi.addYunSuanFu(textField.getText());
double result=0;
if(mark.equals(" +")){
result=num1+num2;
}else if(mark.equals(" -")){
result=num1-num2;
}else if(mark.equals(" *")){
result=num1*num2;
}else if(mark.equals(" /")){
result=num1/num2;
}else{
JOptionPane.showMessageDialog(null, "输入错误！", "错误！", JOptionPane.ERROR_MESSAGE);
}
String strResult=String.valueOf(result);
textField.setText(strResult );

}
});
button_6.setFont(new Font("黑体", Font.PLAIN, 18));

JButton button_9 = new JButton("\u00B1");
button_9.setFont(new Font("黑体", Font.PLAIN, 13));

JButton btnMc = new JButton("MC");
btnMc.setFont(new Font("新宋体", Font.PLAIN, 12));

JButton btnMr = new JButton("MR");
btnMr.setFont(new Font("黑体", Font.PLAIN, 12));

JButton btnMs = new JButton("MS");
btnMs.setFont(new Font("黑体", Font.PLAIN, 12));

JButton btnM = new JButton("M+");
btnM.setFont(new Font("黑体", Font.PLAIN, 12));

JButton btnM_1 = new JButton("M-");
btnM_1.setFont(new Font("黑体", Font.PLAIN, 12));

textField = new JTextField();
textField.setEditable(false);
textField.setColumns(10);
GroupLayout gl_contentPane = new GroupLayout(contentPane);
gl_contentPane.setHorizontalGroup(
gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addGroup(Alignment.LEADING, gl_contentPane.createSequentialGroup()
.addContainerGap()
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addComponent(textField, GroupLayout.DEFAULT_SIZE, 254, Short.MAX_VALUE)
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addGroup(gl_contentPane.createSequentialGroup()
.addComponent(btnMs, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(btnX_1, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.UNRELATED)
.addComponent(button_2, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(button_3, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(button_4, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE))
.addGroup(gl_contentPane.createSequentialGroup()
.addComponent(btnMr, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(button_12, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addGap(10)
.addComponent(button_1, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(button, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(btnNewButton, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE))
.addGroup(gl_contentPane.createSequentialGroup()
.addComponent(btnMc, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(button_11, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.UNRELATED)
.addComponent(button_10, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(btnX, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(button_8, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE))
.addGroup(gl_contentPane.createSequentialGroup()
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING, false)
.addGroup(gl_contentPane.createSequentialGroup()
.addComponent(btnM, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(button_14, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.UNRELATED)
.addComponent(button_5, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE))
.addGroup(gl_contentPane.createSequentialGroup()
.addComponent(btnM_1, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(ComponentPlacement.RELATED)
.addComponent(button_9, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.UNRELATED)
.addComponent(button_6, GroupLayout.PREFERRED_SIZE, 45, GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(ComponentPlacement.RELATED)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING, false)
.addComponent(btnBackspace, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(button_7, GroupLayout.DEFAULT_SIZE, 96, Short.MAX_VALUE)))))
.addContainerGap())
);
gl_contentPane.setVerticalGroup(
gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addGroup(gl_contentPane.createSequentialGroup()
.addContainerGap()
.addComponent(textField, GroupLayout.PREFERRED_SIZE, 76, GroupLayout.PREFERRED_SIZE)
.addPreferredGap(ComponentPlacement.RELATED, 30, Short.MAX_VALUE)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(button_11, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(button_10, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(button_8, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(btnX, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE))
.addComponent(btnMc, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE))
.addPreferredGap(ComponentPlacement.RELATED)
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addComponent(btnMr, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(button_12, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(button_1, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(button, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(btnNewButton, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(ComponentPlacement.UNRELATED)
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(button_4, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(btnX_1, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(button_3, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(button_2, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE))
.addComponent(btnMs, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE))
.addPreferredGap(ComponentPlacement.RELATED)
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(button_7, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(button_5, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE))
.addGroup(gl_contentPane.createParallelGroup(Alignment.LEADING)
.addComponent(button_14, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(btnM, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(ComponentPlacement.RELATED)
.addGroup(gl_contentPane.createParallelGroup(Alignment.TRAILING)
.addGroup(gl_contentPane.createParallelGroup(Alignment.BASELINE)
.addComponent(button_9, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(btnM_1, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE))
.addComponent(button_6, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)
.addComponent(btnBackspace, GroupLayout.PREFERRED_SIZE, 43, GroupLayout.PREFERRED_SIZE)))
);
contentPane.setLayout(gl_contentPane);
}

}