Java计算器 源代码
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Java计算器 源代码：
import java.awt.*;import java.awt.event.*;import javax.swing.*;
/**********************Java计算器 主类*********************/public class SunnyCalculator implements ActionListener { JFrame f; JMenu mEdit; JMenu mView; JMenu mHelp; JMenuItem mCopy; JMenuItem mPaste; JTextField tResult; JButton bNumber; JButton bOperator; JButton bOther; JButton bM; boolean isDouble=false;//是否为实数 int opFlag=-1; static double t1=0,t2=0,t3=0,result=0; static int opflag1=-1,opflag2=-1,flag=0,resflag=1; int preOp,currentOp=0;//标准位 double op1=0,op2=0;//操作数 double n3; StringBuffer buf=new StringBuffer(20); StringBuffer copyBoard=new StringBuffer(20);//剪贴板 StringBuffer memory=new StringBuffer(20);//M系列 StringBuffer str=new StringBuffer(); //Java计算器 构造器 public SunnyCalculator() { f = new JFrame("Sunny计算器_杨梅树的盔甲"); Container contentPane = f.getContentPane(); /**************************Java计算器 菜单的创建*****************************/ JMenuBar mBar = new JMenuBar(); mBar.setOpaque(true); mEdit = new JMenu("编辑(E)"); mEdit.setMnemonic(KeyEvent.VK_E); mCopy = new JMenuItem("复制(C)"); mEdit.add(mCopy); mPaste = new JMenuItem("粘贴(P)"); mEdit.add(mPaste); mView = new JMenu("查看(V)"); mView.setMnemonic(KeyEvent.VK_V); mView.add(new JMenuItem("标准型")); mView.add(new JMenuItem("科学型")); mView.addSeparator(); mView.add(new JMenuItem("查看分组")); mHelp = new JMenu("帮助(H)"); mHelp.setMnemonic(KeyEvent.VK_H); mHelp.add(new JMenuItem("帮助主题")); mHelp.addSeparator(); mHelp.add(new JMenuItem("关于计算器")); mBar.add(mEdit); mBar.add(mView); mBar.add(mHelp); f.setJMenuBar(mBar); contentPane.setLayout(new BorderLayout()); JPanel pTop = new JPanel(); tResult = new JTextField("0.",26); tResult.setHorizontalAlignment(JTextField.RIGHT); tResult.setEditable(false); pTop.add(tResult); contentPane.add(pTop,BorderLayout.NORTH); JPanel pBottom = new JPanel(); pBottom.setLayout(new BorderLayout()); JPanel pLeft = new JPanel(); pLeft.setLayout(new GridLayout(5,1,3,3)); bM = new JButton(" "); bM.setEnabled(false); pLeft.add(bM);
/*************************Java计算器 功能键定义***************************/ bOther = new JButton("MC"); bOther.addActionListener(this); bOther.setForeground(Color.red); bOther.setMargin(new Insets(3,2,3,2)); pLeft.add(bOther);
bOther = new JButton("MR"); bOther.addActionListener(this); bOther.setForeground(Color.red); bOther.setMargin(new Insets(3,2,3,2)); pLeft.add(bOther);
bOther = new JButton("MS"); bOther.addActionListener(this); bOther.setForeground(Color.red); bOther.setMargin(new Insets(3,2,3,2)); pLeft.add(bOther);
bOther = new JButton("M+"); bOther.addActionListener(this); bOther.setForeground(Color.red); bOther.setMargin(new Insets(3,2,3,2)); pLeft.add(bOther);
pBottom.add(pLeft,BorderLayout.WEST); JPanel pRight = new JPanel(); pRight.setLayout(new BorderLayout()); JPanel pUp = new JPanel(); pUp.setLayout(new GridLayout(1,3,3,0));
bOther = new JButton("BackSpace"); bOther.addActionListener(this); bOther.setForeground(Color.red); bOther.setMargin(new Insets(3,0,3,5)); pUp.add(bOther);
bOther = new JButton("CE"); bOther.addActionListener(this); bOther.setForeground(Color.red); pUp.add(bOther);
bOther = new JButton("C"); bOther.addActionListener(this); bOther.setForeground(Color.red); pUp.add(bOther);
/***************************Java计算器 数字键盘区定义**************************/ JPanel pDown = new JPanel(); pDown.setLayout(new GridLayout(4,5,3,2)); bNumber = new JButton("7"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bNumber = new JButton("8"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bNumber = new JButton("9"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bOperator = new JButton("/"); bOperator.setForeground(Color.red); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,0,3,0)); pDown.add(bOperator); bOperator = new JButton("sqrt"); bOperator.addActionListener(this); bOperator.setForeground(Color.red); bOperator.setMargin(new Insets(3,0,3,0)); pDown.add(bOperator); bNumber = new JButton("4"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); bNumber.setHorizontalTextPosition(JButton.LEFT); pDown.add(bNumber); bNumber = new JButton("5"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bNumber = new JButton("6"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bOperator = new JButton("*"); bOperator.setForeground(Color.red); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bOperator = new JButton("%"); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bNumber = new JButton("1"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bNumber = new JButton("2"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bNumber = new JButton("3"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bOperator = new JButton("-"); bOperator.setForeground(Color.red); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bOperator = new JButton("1/x"); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); pDown.add(bOperator); bNumber = new JButton("0"); bNumber.setForeground(Color.blue); bNumber.addActionListener(this); bNumber.setMargin(new Insets(3,3,3,3)); pDown.add(bNumber); bOperator = new JButton("+/-"); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bOperator = new JButton("."); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bOperator = new JButton("+"); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); bOperator = new JButton("="); bOperator.setForeground(Color.blue); bOperator.addActionListener(this); bOperator.setMargin(new Insets(3,3,3,3)); pDown.add(bOperator); pRight.add(pUp,BorderLayout.NORTH); pRight.add(pDown,BorderLayout.SOUTH); pBottom.add(pRight,BorderLayout.EAST); contentPane.add(pBottom,BorderLayout.SOUTH); f.setSize(new Dimension(320,256)); f.setResizable(false); f.setVisible(true); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } } ); } /************************Java计算器 计算方法区***************************/ public void actionPerformed(ActionEvent e) { String s = e.getActionCommand(); if(s.equals("复制(C)")) { String temp = tResult.getText().trim(); copyBoard.replace(0, copyBoard.length(), temp); mPaste.setEnabled(true); } else if(s.equals("粘贴(p)")) { tResult.setText(copyBoard.toString()); } else if(s.equals("CE")) { //如果是CE则清除文本框 tResult.setText("0."); } else if(s.equals("BackSpace")) { if(!tResult.getText().trim().equals("0.")) { //如果文本框中有内容 if(str.length()!=1 && str.length()!=0) { tResult.setText(str.delete(str.length()-1,str.length()).toString()); } else { tResult.setText("0."); str.setLength(0); } } op2 = Double.parseDouble(tResult.getText().trim()); } else if(s.equals("C")) { //如果是C删除当前计算 tResult.setText("0."); op1 = op2 = 0; str.replace(0, str.length(), " "); preOp = currentOp = 0; } else if(s.equals("MC")) { //如果是MC则清除缓冲区 String temp = ""; memory.replace(0, memory.length(), temp); bM.setText(" "); } else if(s.equals("MR")) { //如果按键为MR则恢复缓冲区的数到文本框 tResult.setText(memory.toString()); } else if(s.equals("MS")) { //如果按键为MS则将文本框的数存入缓冲区 String s1 = tResult.getText().trim(); memory.replace(0, memory.length(), s1); bM.setText("M"); } else if(s.equals("M+")) { //如果按键为MS则将文本框值与缓冲区的数相加但不显示结果 String temp1 = tResult.getText().trim(); double dtemp = Double.parseDouble(temp1); String temp2 = memory.toString(); dtemp += Double.parseDouble(temp2); temp1 = String.valueOf(dtemp); memory.replace(0, memory.length(), temp1); } else if(s.equals("1/x")) { //如果按键为1/x则将文本框中的数据为它的倒数 String temp = tResult.getText().trim(); double dtemp = Double.parseDouble(temp); tResult.setText(""+1/dtemp); } else if(s.equals("sqrt")) { //如果按键为sqrt则将文本框中的内容求平方根 String temp = tResult.getText().trim(); double dtemp = Double.parseDouble(temp); tResult.setText(""+Math.sqrt(dtemp)); } else if(s.equals("+")) { str.setLength(0); if(currentOp==0) { preOp = currentOp = 1; op2 = 0; tResult.setText(""+op1); } else { currentOp = preOp; preOp = 1; switch(currentOp){ case 1: op1 += op2; tResult.setText(""+op1); break; case 2: op1 -= op2; tResult.setText(""+op1); break; case 3: op1 *= op2; tResult.setText(""+op1); break; case 4: op1 /= op2; tResult.setText(""+op1); break; } } } else if(s.equals("-")){ str.setLength(0); if(currentOp==0) { preOp=currentOp=2;//op1=op2;op2=0; tResult.setText(""+op1); } else { currentOp =preOp; preOp =2; switch(currentOp){ case 1:op1=op1+op2;tResult.setText(""+op1);break; case 2:op1=op1-op2;tResult.setText(""+op1);break; case 3:op1=op1*op2;tResult.setText(""+op1);break; case 4:op1=op1/op2;tResult.setText(""+op1);break; } } } else if(s.equals("*"))//* { str.setLength(0); if(currentOp==0) { preOp=currentOp=3;//op1=op2;op2=1; tResult.setText(""+op1);//op1=op2; } else { currentOp =preOp; preOp =3; switch(currentOp){ case 1:op1=op1+op2;tResult.setText(""+op1);break; case 2:op1=op1-op2;tResult.setText(""+op1);break; case 3:op1=op1*op2;tResult.setText(""+op1);break; case 4:op1=op1/op2;tResult.setText(""+op1);break; } } } else if(s.equals("/"))// / { str.setLength(0); if(currentOp==0) { preOp=currentOp=4;//op2=1; tResult.setText(""+op1);//op1=op2; } else { currentOp =preOp; preOp =4; switch(currentOp){ case 1:op1=op1+op2;tResult.setText(""+op1);break; case 2:op1=op1-op2;tResult.setText(""+op1);break; case 3:op1=op1*op2;tResult.setText(""+op1);break; case 4:op1=op1/op2;tResult.setText(""+op1);break; } } } else if(s.equals("="))// = { if(currentOp==0) { str.setLength(0); tResult.setText(""+op2); } else { str.setLength(0); currentOp =preOp; switch(currentOp){ case 1:op1=op1+op2;tResult.setText(""+op1);break; case 2:op1=op1-op2;tResult.setText(""+op1);break; case 3:op1=op1*op2;tResult.setText(""+op1);break; case 4:op1=op1/op2;tResult.setText(""+op1);break; } currentOp=0; op2=0; } } else if(s.equals(".")) { isDouble=true; if(tResult.getText().trim().indexOf('.')!=-1); else { if(tResult.getText().trim().equals("0")) { str.setLength(0); tResult.setText((str.append("0"+s)).toString()); } //else if(tResult.getText().trim().equals("")){}//如果初时显示为空则不做任何操作 else { tResult.setText((str.append(s)).toString()); } } } else if(s.equals("0"))//如果选择的是"0"这个数字键 { if(tResult.getText().trim().equals("0.")){} else{ tResult.setText(str.append(s).toString()); op2=Double.parseDouble(tResult.getText().trim()); } } else{ tResult.setText(str.append(s).toString()); op2=Double.parseDouble(tResult.getText().trim()); if(currentOp==0) op1=op2; } }//end actionPerformed public static void main(String[] args) { new SunnyCalculator(); }}
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