import java.awt.*;
import java.awt.event.*; import javax.swing.*;
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 btnC = new JButton(); //清除 JButton btnEq = new JButton(); //等于
JButton btnAdd = new JButton(); //+操作符 JButton btnMin = new JButton(); //-操作符 JButton btnMul = new JButton(); //*操作符 JButton btnDiv = new JButton(); //除操作符
JTextField texResult = new JTextField();
boolean flag=false; String op1; String op2; double result; String action;
public void init(){
contentPane = getContentPane(); contentPane.setLayout(null); setSize(250, 250);
btn0.setBounds(50, 230, 45, 45);
btn0.setFont(new Font(\"Tahoma\", Font.PLAIN, 14)); btn0.setText(\"0\");
btn0.addActionListener(new btn0(this));
//清除操作符
btnC.setBounds(100,230,45,45);
btnC.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btnC.setText(\"C\");
btnC.addActionListener(new btnClear(this));
//=操作符
btnEq.setBounds(150,230,45,45);
btnEq.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btnEq.setText(\"=\");
btnEq.addActionListener(new btnEqual(this));
//+操作符
btnAdd.setBounds(200,230,45,45);
btnAdd.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btnAdd.setText(\"+\");
btnAdd.addActionListener(new btnPlus(this));
btn1.setBounds(50,180,45,45);
btn1.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn1.setText(\"1\");
btn1.addActionListener(new btn1(this));
btn2.setBounds(100,180,45,45);
btn2.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn2.setText(\"2\");
btn2.addActionListener(new btn2(this));
btn3.setBounds(150,180,45,45);
btn3.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn3.setText(\"3\");
btn3.addActionListener(new btn3(this));
//-操作符
btnMin.setBounds(200,180,45,45);
btnMin.setFont(new Font(\"Tahoma\",Font.PLAIN,16)); btnMin.setText(\"-\");
btnMin.addActionListener(new btnMinus(this));
btn4.setBounds(50,130,45,45);
btn4.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn4.setText(\"4\");
btn4.addActionListener(new btn4(this));
btn5.setBounds(100,130,45,45);
btn5.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn5.setText(\"5\");
btn5.addActionListener(new btn5(this));
btn6.setBounds(150,130,45,45);
btn6.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn6.setText(\"6\");
btn6.addActionListener(new btn6(this));
//*操作符
btnMul.setBounds(200,130,45,45);
btnMul.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btnMul.setText(\"*\");
btnMul.addActionListener(new btnMultiply(this));
btn7.setBounds(50,80,45,45);
btn7.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn7.setText(\"7\");
btn7.addActionListener(new btn7(this));
btn8.setBounds(100,80,45,45);
btn8.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn8.setText(\"8\");
btn8.addActionListener(new btn8(this));
btn9.setBounds(150,80,45,45);
btn9.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btn9.setText(\"9\");
btn9.addActionListener(new btn9(this));
//除操作符
btnDiv.setBounds(200,80,45,45);
btnDiv.setFont(new Font(\"Tahoma\",Font.PLAIN,14)); btnDiv.setText(\"/\");
btnDiv.addActionListener(new btnDivide(this));
texResult.setText(\"\");
texResult.setBounds(40, 35, 215, 35);
texResult.setFont(new 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(btnC); contentPane.add(btnEq); contentPane.add(btnAdd); contentPane.add(btnMin); contentPane.add(btnMul); contentPane.add(btnDiv);
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){
op1 = 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){
op1 = 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){
op1 = 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){
op1 = 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;
op2 = texResult.getText();
if(!flag){
if(action.equals(\"plus\")){
digit1 = Double.parseDouble(op1); digit2 = Double.parseDouble(op2); result = digit1 + digit2;
texResult.setText(\"\" + result); flag = true; }
else if(action.equals(\"minus\")){
digit1 = Double.parseDouble(op1); digit2 = Double.parseDouble(op2); result = digit1 - digit2;
texResult.setText(\"\"+result); flag = true; }
else if(action.equals(\"multiply\")){
digit1 = Double.parseDouble(op1); digit2 = Double.parseDouble(op2); result = digit1 * digit2;
texResult.setText(\"\"+result); flag = true; }
else if(action.equals(\"divide\")){
digit1 = Double.parseDouble(op1); digit2 = Double.parseDouble(op2); 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); } }
public static void main(String args[]){ JApplet cal = new calculator(); JFrame frame = new JFrame(); cal.init();
frame.setTitle(\"小计算器\");
frame.getContentPane().add(cal); frame.setVisible(true); }
}
运行结果：
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