.设计一个简单计算器,JAVA
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class jisuanqi extends Applet implements ActionListener
{
double x=0;
double y=0;
double w;
int h=0;
TextField t=new TextField(15);
Button b1=new Button("1");
Button b2=new Button("2");
Button b3=new Button("3");
Button b4=new Button("4");
Button b5=new Button("5");
Button b6=new Button("6");
Button b7=new Button("7");
Button b8=new Button("8");
Button b9=new Button("9");
Button b0=new Button("0");
Button b10=new Button("+");
Button b11=new Button("-");
Button b12=new Button("*");
Button b13=new Button("/");
Button b14=new Button("C");
Button b15=new Button("=");
public void init()
{
setLayout(new BorderLayout());
add(t,"North");
Panel p1=new Panel();
add(p1,"Center");
p1.setLayout(new GridLayout(4,4,5,5));
p1.add(b1);
p1.add(b2);
p1.add(b3);
p1.add(b14);
p1.add(b4);
p1.add(b5);
p1.add(b6);
p1.add(b10);
p1.add(b7);
p1.add(b8);
p1.add(b9);
p1.add(b11);
p1.add(b0);
p1.add(b12);
p1.add(b13);
p1.add(b15);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
b10.addActionListener(this);
b11.addActionListener(this);
b12.addActionListener(this);
b13.addActionListener(this);
b14.addActionListener(this);
b15.addActionListener(this);
b0.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
String ts=e.getActionCommand();
char ysf=ts.charAt(0);
if(ts=="C") t.setText("");
else if(ts=="+")
{
x=Integer.parseInt(t.getText());
t.setText("");
h=1;
}
else if(ts=="-")
{
x=Integer.parseInt(t.getText());
t.setText("");
h=2;
}
else if(ts=="*")
{
x=Integer.parseInt(t.getText());
t.setText("");
h=3;
}
else if(ts=="/")
{
x=Integer.parseInt(t.getText());
t.setText("");
h=4;
}
else if(ts.equals("="))
{
y=Integer.parseInt(t.getText());
switch(h)
{
case 1:w = x+y; break;
case 2:w = x-y; break;
case 3:w = x*y; break;
case 4:w = x/y;
}
t.setText(String.valueOf(w));
}
else
{
t.setText(t.getText()+ts);
}
}
}
无聊写了个，修复了下Bug：
import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JTextField;public class Calculate extends JFrame implements ActionListener { private static final long serialVersionUID = 1L; private JButton plus, reduce, multiply, divice, reset; private JTextField one, two, result; private boolean device_falg = false; private final int width = 400, height = 300; public Calculate() { super("修改密码"); this.setLayout(null); this.setSize(width, height); init(); Layout(); } public void init() { plus = new JButton("加 "); reduce = new JButton("减 "); multiply = new JButton("乘 "); divice = new JButton("除 "); reset = new JButton("清空"); one = new JTextField(); two = new JTextField(); result = new JTextField(); } public void Layout() { this.add(new JLabel("第一个数")).setBounds(20, 10, 60, 80); this.add(one).setBounds(100, 38, 100, 25); this.add(new JLabel("第二个数")).setBounds(20, 40, 60, 80); this.add(two).setBounds(100, 70, 100, 25); this.add(new JLabel("结果")).setBounds(20, 85, 60, 80); this.add(result).setBounds(100, 110, 100, 25); this.add(plus).setBounds(70, 170, 80, 25); this.add(reduce).setBounds(200, 170, 80, 25); this.add(multiply).setBounds(70, 200, 80, 25); this.add(divice).setBounds(200, 200, 80, 25); this.add(reset).setBounds(300, 220, 80, 25); plus.addActionListener(this); reduce.addActionListener(this); multiply.addActionListener(this); divice.addActionListener(this); reset.addActionListener(this); this.setVisible(true); this.setDefaultCloseOperation(DISPOSE_ON_CLOSE); } public boolean Format() { boolean FLAG = false; boolean flag = false; String one = this.one.getText().toString().trim(); String two = this.two.getText().toString().trim(); if (one == null || one.equals("") || two == null || two.equals("")) { JOptionPane.showMessageDialog(getParent(), "请输入完整信息!"); FLAG = false; flag = true; } boolean boll_1 = one.matches("[\\d]{1,100}"); boolean boll_2 = two.matches("[\\d]{1,100}"); boolean boll_3 = one.matches("[\\d]{1,100}+[.]+[\\d]{1,100}"); boolean boll_4 = two.matches("[\\d]{1,100}+[.]+[\\d]{1,100}"); if (flag) { return false; } if ((boll_1 && boll_2) || (boll_3 && boll_4) || (boll_1 && boll_4) || (boll_3 && boll_2)) { FLAG = true; } else { JOptionPane.showMessageDialog(getParent(), "请输入数字!"); FLAG = false; } if (FLAG && device_falg) { if (Double.parseDouble(two) == 0) { JOptionPane.showMessageDialog(getParent(), "被除数不能为0!"); FLAG = false; device_falg=false; } } return FLAG; } public double Plus(double one, double two) { return one + two; } public double Multiply(double one, double two) { return one * two; } public double Divice(double one, double two) { return one / two; } public double Reduce(double one, double two) { return one - two; } public void Clear() { one.setText(""); two.setText(""); result.setText(""); } @Override public void actionPerformed(ActionEvent e) { Object o = e.getSource(); if (o == reset) { Clear(); return; } if (o == divice) { device_falg = true; } if (!Format()) { return; } double one = Double.parseDouble(this.one.getText()); double two = Double.parseDouble(this.two.getText()); double result = 0; if (o == plus) { result = Plus(one, two); } else if (o == reduce) { result = Reduce(one, two); } else if (o == multiply) { result = Multiply(one, two); } else if (o == divice) { result = Divice(one, two); } this.result.setText("" + result); } public static void main(String[] args) { new Calculate(); }}
以下是我按你的需求手写的代码，希望对你有所帮助，望采纳
import java.awt.*;
import java.awt.event.*;
public class Test extends Frame{
public static void main(String args[]) {
new Test();
}
TextField number1 = new TextField();
TextField number2 = new TextField();
TextField result = new TextField();
Button plus = new Button("+");
Button subtract = new Button("-");
Button multiply = new Button("×");
Button divide = new Button("÷");
double num1,num2,resl;
Test(){
setLayout(null);
// 关闭窗口
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
setBounds(200, 100, 400, 300);
setTitle("简单计算器");
// 设置窗口是否可变大小
setResizable(false);
setVisible(true);
number1.setBounds(100, 80, 150, 20);
add(number1);
number2.setBounds(100, 130, 150, 20);
add(number2);
result.setBounds(100, 180, 150, 20);
add(result);
plus.setBounds(300, 55, 80, 20);
add(plus);
plus.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (number1.getText().trim() != "" && number2.getText().trim() != "") {
num1 = Double.parseDouble(number1.getText().trim());
num2 = Double.parseDouble(number2.getText().trim());
resl = num1 + num2;
result.setText(String.valueOf(resl));
number1.setText("");
number2.setText("");
}
}
});
subtract.setBounds(300, 105, 80, 20);
add(subtract);
subtract.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (number1.getText().trim() != "" && number2.getText().trim() != "") {
num1 = Double.parseDouble(number1.getText().trim());
num2 = Double.parseDouble(number2.getText().trim());
resl = num1 - num2;
result.setText(String.valueOf(resl));
number1.setText("");
number2.setText("");
}
}
});
multiply.setBounds(300, 155, 80, 20);
add(multiply);
multiply.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (number1.getText().trim() != "" && number2.getText().trim() != "") {
num1 = Double.parseDouble(number1.getText().trim());
num2 = Double.parseDouble(number2.getText().trim());
resl = num1 * num2;
result.setText(String.valueOf(resl));
number1.setText("");
number2.setText("");
}
}
});
divide.setBounds(300, 205, 80, 20);
add(divide);
divide.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (number1.getText().trim() != "" && number2.getText().trim() != "") {
num1 = Double.parseDouble(number1.getText().trim());
num2 = Double.parseDouble(number2.getText().trim());
resl = num1 / num2;
result.setText(String.valueOf(resl));
number1.setText("");
number2.setText("");
}
}
});
}
public void paint(Graphics g) {
g.setColor(Color.LIGHT_GRAY);
g.fillRect(20, 45, 250, 230);
g.setColor(Color.BLACK);
g.drawString("操作数", 60, 95);
g.drawString("操作数", 60, 145);
g.drawString("结果", 70, 195);
}
}
package zhidao;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class TestComputer extends JFrame implements ActionListener{
private JTextField op1;
private JTextField op2;
private JTextField result;
private JButton add;
private JButton del;
private JButton mul;
private JButton mod;
public TestComputer() {
setBounds(200, 200, 400, 300);
setResizable(false);
getContentPane().setLayout(null);
JPanel panel = new JPanel();
panel.setBounds(33, 25, 176, 215);
getContentPane().add(panel);
panel.setLayout(null);
JLabel label = new JLabel("\u64CD\u4F5C\u65701");
label.setBounds(10, 28, 54, 15);
panel.add(label);
JLabel label_1 = new JLabel("\u64CD\u4F5C\u65702");
label_1.setBounds(10, 69, 54, 15);
panel.add(label_1);
JLabel label_2 = new JLabel("\u7ED3\u679C");
label_2.setBounds(10, 138, 54, 15);
panel.add(label_2);
op1 = new JTextField();
op1.setBounds(74, 25, 92, 21);
panel.add(op1);
op1.setColumns(10);
op2 = new JTextField();
op2.setBounds(74, 66, 92, 21);
panel.add(op2);
op2.setColumns(10);
result = new JTextField();
result.setBounds(74, 135, 92, 21);
panel.add(result);
result.setColumns(10);
add = new JButton("+");
add.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
add.setBounds(283, 35, 93, 23);
getContentPane().add(add);
add.addActionListener(this);
del = new JButton("-");
del.setBounds(283, 74, 93, 23);
getContentPane().add(del);
del.addActionListener(this);
mul = new JButton("*");
mul.setBounds(283, 118, 93, 23);
getContentPane().add(mul);
mul.addActionListener(this);
mod = new JButton("÷");
mod.setBounds(283, 164, 93, 23);
getContentPane().add(mod);
mod.addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String text1 = op1.getText();
String text2 = op2.getText();
Double opr1 = Double.valueOf(text1);
Double opr2 = Double.valueOf(text2);
Object source = e.getSource();
if(add == source){
result.setText(opr1+opr2+"");
}
if(del == source){
result.setText(opr1-opr2+"");
}
if(mul == source){
result.setText(opr1*opr2+"");
}
if(mod == source){
result.setText(opr1/opr2+"");
}
}
public static void main(String[] args) {
new TestComputer().setVisible(true);
}
}
操作类：
public class text {
//加
public double add(double one ,double two){
double result = one + two;
return result;
}
//减
public double add(double one ,double two){
double result = one - two;
return result;
}
//乘
public double take(double one ,double two){
double result = one * two;
return result;
}
//除
public double divide(double one ,double two){
double result = one/two;
return result;
}
}
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