求一个JAVA程序

/////calculator.java代码import java.applet.*;import java.awt.*;import java.awt.event.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.*;import javax.swing.event.*;public class calculator extends JApplet{Container contentPane; JButton btn0 = new JButton(); JButton btn1 = new JButton(); JButton btn2 = new JButton(); JButton btn3 = new JButton(); JButton btn4 = new JButton(); JButton btn5 = new JButton(); JButton btn6 = new JButton(); JButton btn7 = new JButton(); JButton btn8 = new JButton(); JButton btn9 = new JButton(); //特殊按钮 JButton btnClear = new JButton(); //清除 JButton btnEqual = new JButton(); //等于 JButton btnPlus = new JButton(); //+操作e68a843231313335323631343130323136353331333236373866符 JButton btnMinus = new JButton(); //-操作符 JButton btnMultiply = new JButton(); //*操作符 JButton btnDivide = new JButton(); //除操作符 JTextField texResult = new JTextField(); boolean flag=false; String operand1; String operand2; double result; String action; public void init(){contentPane = getContentPane(); contentPane.setLayout(null); setSize(new Dimension(250, 250)); btn0.setBounds(new Rectangle(50, 230, 45, 45)); btn0.setFont(new java.awt.Font(\"Tahoma\", Font.PLAIN, 14)); btn0.setText(\"0\"); btn0.addActionListener(new btn0(this)); //清除操作符 btnClear.setBounds(new Rectangle(100,230,45,45)); btnClear.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btnClear.setText(\"C\"); btnClear.addActionListener(new btnClear(this)); //=操作符 btnEqual.setBounds(new Rectangle(150,230,45,45)); btnEqual.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btnEqual.setText(\"=\"); btnEqual.addActionListener(new btnEqual(this)); //+操作符 btnPlus.setBounds(new Rectangle(200,230,45,45)); btnPlus.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btnPlus.setText(\"+\"); btnPlus.addActionListener(new btnPlus(this)); btn1.setBounds(new Rectangle(50,180,45,45)); btn1.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn1.setText(\"1\"); btn1.addActionListener(new btn1(this)); btn2.setBounds(new Rectangle(100,180,45,45)); btn2.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn2.setText(\"2\"); btn2.addActionListener(new btn2(this)); btn3.setBounds(new Rectangle(150,180,45,45)); btn3.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn3.setText(\"3\"); btn3.addActionListener(new btn3(this)); //-操作符 btnMinus.setBounds(new Rectangle(200,180,45,45)); btnMinus.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,16)); btnMinus.setText(\"-\"); btnMinus.addActionListener(new btnMinus(this)); btn4.setBounds(new Rectangle(50,130,45,45)); btn4.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn4.setText(\"4\"); btn4.addActionListener(new btn4(this)); btn5.setBounds(new Rectangle(100,130,45,45)); btn5.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn5.setText(\"5\"); btn5.addActionListener(new btn5(this)); btn6.setBounds(new Rectangle(150,130,45,45)); btn6.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn6.setText(\"6\"); btn6.addActionListener(new btn6(this)); //*操作符 btnMultiply.setBounds(new Rectangle(200,130,45,45)); btnMultiply.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btnMultiply.setText(\"*\"); btnMultiply.addActionListener(new btnMultiply(this)); btn7.setBounds(new Rectangle(50,80,45,45)); btn7.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn7.setText(\"7\"); btn7.addActionListener(new btn7(this)); btn8.setBounds(new Rectangle(100,80,45,45)); btn8.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn8.setText(\"8\"); btn8.addActionListener(new btn8(this)); btn9.setBounds(new Rectangle(150,80,45,45)); btn9.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btn9.setText(\"9\"); btn9.addActionListener(new btn9(this)); //除操作符 btnDivide.setBounds(new Rectangle(200,80,45,45)); btnDivide.setFont(new java.awt.Font(\"Tahoma\",Font.PLAIN,14)); btnDivide.setText(\"/\"); btnDivide.addActionListener(new btnDivide(this)); texResult.setText(\"\"); texResult.setBounds(new Rectangle(40, 35, 215, 35)); texResult.setFont(new java.awt.Font(\"Tahoma\", Font.PLAIN, 14)); texResult.setHorizontalAlignment(JTextField.RIGHT); contentPane.add(btn0); contentPane.add(btn1); contentPane.add(btn2); contentPane.add(btn3); contentPane.add(btn4); contentPane.add(btn5); contentPane.add(btn6); contentPane.add(btn7); contentPane.add(btn8); contentPane.add(btn9); contentPane.add(btnClear); contentPane.add(btnEqual); contentPane.add(btnPlus); contentPane.add(btnMinus); contentPane.add(btnMultiply); contentPane.add(btnDivide); contentPane.add(texResult); }//0的事件监听器 public void btn0_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn0.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn0.getActionCommand()); } } class btn0 implements ActionListener{ private calculator adaptee; btn0(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn0_actionPerformed(e); } }//1的事件监听器 public void btn1_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn1.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn1.getActionCommand()); } } class btn1 implements ActionListener{ private calculator adaptee; btn1(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn1_actionPerformed(e); } } //2的事件监听器 public void btn2_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn2.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn2.getActionCommand()); } } class btn2 implements ActionListener{ private calculator adaptee; btn2(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn2_actionPerformed(e); } } //3的事件监听器 public void btn3_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn3.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn3.getActionCommand()); } } class btn3 implements ActionListener{ private calculator adaptee; btn3(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn3_actionPerformed(e); } } //4的事件监听器 public void btn4_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn4.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn4.getActionCommand()); } } class btn4 implements ActionListener{ private calculator adaptee; btn4(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn4_actionPerformed(e); } } //5的事件监听器 public void btn5_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn5.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn5.getActionCommand()); } } class btn5 implements ActionListener{ private calculator adaptee; btn5(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn5_actionPerformed(e); } } //6的事件监听器 public void btn6_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn6.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn6.getActionCommand()); } } class btn6 implements ActionListener{ private calculator adaptee; btn6(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn6_actionPerformed(e); } } //7的事件监听器 public void btn7_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn7.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn7.getActionCommand()); } } class btn7 implements ActionListener{ private calculator adaptee; btn7(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn7_actionPerformed(e); } } //8的事件监听器 public void btn8_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn8.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn8.getActionCommand()); } } class btn8 implements ActionListener{ private calculator adaptee; btn8(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn8_actionPerformed(e); } } //9的事件监听器 public void btn9_actionPerformed(ActionEvent e){ if(flag){ texResult.setText(btn9.getActionCommand()); flag = false; } else{ texResult.setText(texResult.getText()+btn9.getActionCommand()); } } class btn9 implements ActionListener{ private calculator adaptee; btn9(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btn9_actionPerformed(e); } } //清除操作 public void btnClear_actionPerformed(ActionEvent e){ texResult.setText(\"\"); } class btnClear implements ActionListener{ private calculator adaptee; btnClear(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btnClear_actionPerformed(e); } } //+操作事件监听器 public void btnPlus_actionPerformed(ActionEvent e){ operand1 = texResult.getText(); action = \"plus\"; flag = true; } class btnPlus implements ActionListener{ private calculator adaptee; btnPlus(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btnPlus_actionPerformed(e); } } //-操作事件监听器 public void btnMinus_actionPerformed(ActionEvent e){ operand1 = texResult.getText(); action = \"minus\"; flag = true; } class btnMinus implements ActionListener{ private calculator adaptee; btnMinus(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btnMinus_actionPerformed(e); } } //*操作事件监听器 public void btnMultiply_actionPerformed(ActionEvent e){ operand1 = texResult.getText(); action = \"multiply\"; flag = true; } class btnMultiply implements ActionListener{ private calculator adaptee; btnMultiply(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btnMultiply_actionPerformed(e); } } //除操作事件监听器 public void btnDivide_actionPerformed(ActionEvent e){ operand1 = texResult.getText(); action = \"divide\"; flag = true; } class btnDivide implements ActionListener{ private calculator adaptee; btnDivide(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btnDivide_actionPerformed(e); } } //=操作事件监听器 public void btnEqual_actionPerformed(ActionEvent e){ double digit1; double digit2; operand2 = texResult.getText(); if(!flag){ if(action.equals(\"plus\")){ digit1 = Double.parseDouble(operand1); digit2 = Double.parseDouble(operand2); result = digit1 + digit2; texResult.setText(\"\" + result); flag = true; } else if(action.equals(\"minus\")){ digit1 = Double.parseDouble(operand1); digit2 = Double.parseDouble(operand2); result = digit1 - digit2; texResult.setText(\"\"+result); flag = true; } else if(action.equals(\"multiply\")){ digit1 = Double.parseDouble(operand1); digit2 = Double.parseDouble(operand2); result = digit1 * digit2; texResult.setText(\"\"+result); flag = true; } else if(action.equals(\"divide\")){ digit1 = Double.parseDouble(operand1); digit2 = Double.parseDouble(operand2); result = digit1 / digit2; texResult.setText(\"\"+result); flag = true; } } } class btnEqual implements ActionListener{ private calculator adaptee; btnEqual(calculator adaptee){ this.adaptee=adaptee; } public void actionPerformed(ActionEvent e){ adaptee.btnEqual_actionPerformed(e); } }}////calculator.html文件代码<html><head><title>计算器</title></head><center><applet code=calculator.class width=300 height=300></applet></center></html>以上只要有java运行环境JDK，将calculator.java文件编译，然后建一文本文件，直接运行calculator.html就可以看到效果

//界面import javax.swing.*;import java.awt.*;import java.awt.event.*;public class computor{ private JFrame jf = null; private JButton jbadd, jbsub, jbmutil, jbdiv, jbequal, jbdot, jbcr; private JTextField jexpression; private JButton jb[] = new JButton[10]; private Font newfnt; private Font oldfnt; public computor(){ newfnt = new Font(null, Font.BOLD, 30); //expfnt = new Font(null, Font.BOLD, 20); jexpression = new JTextField(\"\"); jexpression.setHorizontalAlignment(JTextField.RIGHT); //jexpression.setFont(expfnt); for(int index=0; index<10; index++) { jb[index] = new JButton(index+\"\"); jb[index].addActionListener(new ExpressionButtonHandler()); jb[index].addMouseListener(new EnterOutHandle()); //jb[index].setFont(fnt); } oldfnt = jb[0].getFont(); jbequal = new JButton(\"=\"); jbequal.addActionListener(new ResultButtonHandler()); //jbequal.setFont(fnt); jbdot = new JButton(\".\"); jbdot.addActionListener(new ExpressionButtonHandler()); //jbdot.setFont(fnt); jbadd = new JButton(\"+\"); jbadd.addActionListener(new ExpressionButtonHandler()); //jbadd.setFont(fnt); jbsub = new JButton(\"-\"); jbsub.addActionListener(new ExpressionButtonHandler()); //jbsub.setFont(fnt); jbmutil = new JButton(\"*\"); jbmutil.addActionListener(new ExpressionButtonHandler()); //jbmutil.setFont(fnt); jbdiv = new JButton(\"/\"); jbdiv.addActionListener(new ExpressionButtonHandler()); //jbdiv.setFont(fnt); jbcr = new JButton(\"CR\"); jbcr.addActionListener(new CRButtonHandler()); //jbcr.setFont(fnt); jf = new JFrame(); jf.setTitle(\"Swing计算器\"); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jf.setSize(400, 200); jf.setLocation(100, 200); jf.setLayout(new BorderLayout()); //总体布局JPanel jptop = new JPanel(new GridLayout(1,2)); jptop.add(jexpression); jptop.add(jbcr); JPanel jpdown = new JPanel(new GridLayout(4,4)); jpdown.add(jb[1]); jpdown.add(jb[2]); jpdown.add(jb[3]); jpdown.add(jbadd); jpdown.add(jb[4]); jpdown.add(jb[5]); jpdown.add(jb[6]); jpdown.add(jbsub); jpdown.add(jb[7]); jpdown.add(jb[8]); jpdown.add(jb[9]); jpdown.add(jbmutil); jpdown.add(jbdot); jpdown.add(jb[0]); jpdown.add(jbequal); jpdown.add(jbdiv); Container ca = jf.getContentPane(); ca.add(jptop, BorderLayout.NORTH); ca.add(jpdown, BorderLayout.CENTER); jf.show(); } //定义事件处理类 private class ExpressionButtonHandler implements ActionListener { public void actionPerformed(ActionEvent e) { JButton jbut = (JButton)e.getSource(); String exp = jexpression.getText(); exp = exp + jbut.getText(); jexpression.setText(exp); } } //定义事件处理类 private class CRButtonHandler implements ActionListener { public void actionPerformed(ActionEvent e) { jexpression.setText(\"\"); } } public class EnterOutHandle implements MouseListener { public void mousePressed(MouseEvent e){ } public void mouseReleased(MouseEvent e){ } public void mouseEntered(MouseEvent e){ JButton jbsource = (JButton)e.getSource(); jbsource.setFont(newfnt); } public void mouseExited(MouseEvent e){ JButton jbsource = (JButton)e.getSource(); jbsource.setFont(oldfnt); } public void mouseClicked(MouseEvent e){ } } //定义事件处理类 private class ResultButtonHandler implements ActionListener { public void actionPerformed(ActionEvent e) { String exp = jexpression.getText(); //利用expression类来计算结果32313133353236313431303231363533e58685e5aeb931333236373866 expression expr = new expression(exp); double re = 0; try{ re = expr.getResult(); }catch(IllegalExpressionException le) { JOptionPane.showMessageDialog(jf, le.toString()); } jexpression.setText(re + \"\"); } } public static void main(String[] args) { computor jf = new computor(); }}/*.从命令行接收一个表达式，计算该表达式的值。简单的+ - * / %java work3 1+2javac work3 特殊：单独一个*的参数，系统会将当前目录下的所有的文件名作为参数因此要求所有的表达式不要有空格，若有空格，则必须用\"\"括起来*/class IllegalExpressionException extends Exception{ public IllegalExpressionException(String exp){ super(exp); }}public class expression{ public String exp = null, texp = null; public String op1, op2; public String operator;public expression(String exp){ this.exp = new String(exp); texp = new String(exp); op1 = new String(); op2 = new String(); operator = new String(); } public void setExpression(String exp){ this.exp = new String(exp); texp = new String(exp); op1 = new String(); op2 = new String(); operator = new String(); } public String getExpression(){ return exp.toString(); } private void getOp1(){ int index = 0; for(index=0; index<texp.length(); index++) { char c = texp.charAt(index); if ((c>=\'0\' && c<=\'9\') || (c==\'.\') || (c==\'e\')|| (c==\'E\')) {} else break; } op1 = texp.substring(0, index); texp = texp.substring(index); //删除op1部分 } private void getOp2(){ //必须要先解析op1, operator op2 = new String(texp); } private void getOperator(){ int index = 0; for(index=0; index<texp.length(); index++) { char c = texp.charAt(index); if ((c>=\'0\' && c<=\'9\') || (c==\'.\')) break; }operator = texp.substring(0, index); texp = texp.substring(index); //删除op1部分 } public double getResult() throws IllegalExpressionException { getOp1(); getOperator(); getOp2(); //对获取到的参数和运算符进行转换 double re = 0; double dop1, dop2; char c = \' \'; //获取运算符 try{ dop1 = Double.parseDouble(op1); dop2 = Double.parseDouble(op2); }catch(NumberFormatException e) { throw new IllegalExpressionException(\"错误的操作数\"); } operator = operator.trim(); if (operator.length()!=1) { throw new IllegalExpressionException(\"错误的运算符\"); } c= operator.charAt(0); switch(c){ case \'+\': re = dop1 + dop2; break; case \'-\': re = dop1 - dop2; break; case \'*\': re = dop1 * dop2; break; case \'/\': re = dop1 / dop2; break; default: throw new IllegalExpressionException(\"错误的运算符\"); } return re; }public static void main(String[] argvs){ expression e = new expression(\"3.1 + 4+\"); try{ System.out.println(e.getResult()); System.out.println(e.op1); System.out.println(e.operator); System.out.println(e.op2); System.out.println(e.getExpression()); } catch(IllegalExpressionException ee) { System.out.println(ee.toString()); } }}