import javax.swing.*;
import java.awt.*;
import java.util.Currency;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
public
class Calculator {
public static void gui() {
//窗口定义
JFrame frame = new JFrame("计算机");
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLayout(new BorderLayout());
frame.setSize(((int)screenSize.getHeight()/2)+20,((int)screenSize.getWidth()/4)+50);
frame.setLocation((int)screenSize.getWidth()/4,(int)screenSize.getHeight()/4);
frame.setVisible(true);
//面板定义
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
JPanel panel4 = new JPanel();
//JScrollPane scrollPane = new JScrollPane();
Box box = Box.createVerticalBox();
//布局定义及设置
//scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
panel1.setLayout(new FlowLayout());
panel2.setLayout(new GridLayout(4, 4,5,5));
panel3.setLayout(new FlowLayout());
//panel4.setLayout(new FlowLayout());
//组件定义
JLabel label1 = new JLabel("计算结果");
JTextArea textArea = new JTextArea(2,20);
JTextArea textArea1= new JTextArea(3,43);
textArea1.setEditable(false);
textArea.setEditable(false);
JTextField textField = new JTextField(10);
/*
//循环定义数字按钮
for(int i=0;i<10;i++) {
JButton button = new JButton(String.valueOf(i));
panel2.add(button);
}
*/
JButton button = new JButton("归零");
JButton button0 = new JButton("0");
JButton button1 = new JButton("1");
JButton button2 = new JButton("2");
JButton button3 = new JButton("3");
JButton button4 = new JButton("4");
JButton button5 = new JButton("5");
JButton button6 = new JButton("6");
JButton button7 = new JButton("7");
JButton button8 = new JButton("8");
JButton button9 = new JButton("9");
JButton button1_1 = new JButton("+");
JButton button1_2 = new JButton("-");
JButton button1_3 = new JButton("×");
JButton button1_4 = new JButton("÷");
JButton button1_5 = new JButton("=");
JButton button1_6 = new JButton(".");
//组件布局
panel1.add(textArea);
panel1.add(label1);
panel1.add(textField);
panel1.add(button);
panel2.add(button7); //添加按钮
panel2.add(button8);
panel2.add(button9);
panel2.add(button1_4);
panel2.add(button4);
panel2.add(button5);
panel2.add(button6);
panel2.add(button1_3);
panel2.add(button1);
panel2.add(button2);
panel2.add(button3);
panel2.add(button1_2);
panel2.add(button0);
panel2.add(button1_6);
panel2.add(button1_5);
panel2.add(button1_1);
panel4.add(textArea1);
/*
box.add(button1);
box.add(Box.createVerticalStrut(20));
box.add(button2);
box.add(Box.createVerticalStrut(20));
box.add(button3);
box.add(Box.createVerticalStrut(20));
box.add(button4);
panel3.add(box);
panel4.add(Box.createHorizontalStrut(50));
*/
panel1.setVisible(true);
panel2.setVisible(true);
panel4.setVisible(true);
frame.add(panel1,BorderLayout.NORTH);
frame.add(panel2,BorderLayout.CENTER);
frame.add(panel4,BorderLayout.SOUTH);
//frame.add(panel3,BorderLayout.EAST);
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//功能设计
//结果寄存器
AtomicReference<Double> y = new AtomicReference<>((double) 0);
//计算寄存器
AtomicReference<Double> p2 = new AtomicReference<>((double) 0);
AtomicReference<Double> p4=new AtomicReference<>((double) 0);
//运算符标识器
AtomicInteger i = new AtomicInteger();
//数字区
AtomicBoolean x = new AtomicBoolean(true);
//小数点计数器
button0.addActionListener(e -> {
textArea.append("0");
textArea1.append("0");
});
button1.addActionListener(e -> {
textArea.append("1");
textArea1.append("1");
});
button2.addActionListener(e -> {
textArea.append("2");
textArea1.append("2");
});
button3.addActionListener(e -> {
textArea.append("3");
textArea1.append("3");
});
button4.addActionListener(e -> {
textArea.append("4");
textArea1.append("4");
});
button5.addActionListener(e -> {
textArea.append("5");
textArea1.append("5");
});
button6.addActionListener(e -> {
textArea.append("6");
textArea1.append("6");
});
button7.addActionListener(e -> {
textArea.append("7");
textArea1.append("7");
});
button8.addActionListener(e -> {
textArea.append("8");
textArea1.append("8");
});
button9.addActionListener(e -> {
textArea.append("9");
textArea1.append("9");
});
button1_6.addActionListener(e -> {
if(x.get()){
textArea.append(".");
textArea1.append(".");
}
else{
JOptionPane.showMessageDialog(frame, "小数点错误");
}
x.set(false);
});//小数点
//计算区
button1_1.addActionListener(e -> {
textArea1.append("+");
String p1 = textArea.getText();
p2.set(Double.parseDouble(p1));
textArea.setText("");
i.set(1);
});
//+
button1_2.addActionListener(e -> {
textArea1.append("-");
String p1 = textArea.getText();
p2.set(Double.parseDouble(p1));
textArea.setText("");
i.set(2);
});
//-
button1_3.addActionListener(e -> {
textArea1.append("×");
String p1 = textArea.getText();
p2.set(Double.parseDouble(p1));
textArea.setText("");
i.set(3);
});
//X
button1_4.addActionListener(e -> {
textArea1.append("÷");
String p1 = textArea.getText();
p2.set(Double.parseDouble(p1));
textArea.setText("");
i.set(4);
});
///
//结果区
button1_5.addActionListener(e -> {
textArea1.append("=");
String p3 = textArea.getText();
p4.set(Double.parseDouble(p3));
// y.set(p2.get()+p4.get());
switch (i.get()){
case 1:y.set(p2.get() + p4.get());break;
case 2:y.set(p2.get() - p4.get());break;
case 3:y.set(p2.get() * p4.get());break;
case 4:y.set(p2.get() / p4.get());break;
default:break;
}
textArea1.append(String.valueOf(y.get()));
textArea1.append("\n");
textArea.setText("");
textField.setText(String.valueOf(y.get()));
});//显示并初始化
//归零区
button.addActionListener(e -> {
textArea.setText("");
textField.setText("");
});
}
public static void main(String[] args) {
SwingUtilities.invokeLater(Calculator::gui);
}
}
把计算后的结果用全局变量存放起来。这个逻辑问题，你可以网上百度简易计算器，看下里面的逻辑，一般都会有支持连续计算的。
完整计算器代码：
package T7;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calc extends JFrame implements ActionListener,KeyListener{
JTextField txtResult;
JButton btn0,btn1,btn2,btn3,btn4,btn5,btn6,btn7,btn8,btn9;
JButton btnAdd,btnSub,btnTimes,btnDiv,btnEquals,btnDot;
JButton btnClear,btnExit;
JPanel centerPanel,southPanel;
double num1=0,num2=0,result=0;
String opr= "+";
public Calc() {
setTitle("计算器2016");
txtResult = new JTextField("0.0");
//只读
// txtResult.setEditable(false);
centerPanel = new JPanel(new GridLayout(4,4,5,5));
southPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
add(txtResult,BorderLayout.NORTH);
txtResult.addKeyListener(this);
add(centerPanel);
btn0 = new JButton("0");
btn1 = new JButton("1");
btn2 = new JButton("2");
btn3 = new JButton("3");
btn4 = new JButton("4");
btn5 = new JButton("5");
btn6 = new JButton("6");
btn7 = new JButton("7");
btn8 = new JButton("8");
btn9 = new JButton("9");
btnAdd = new JButton("+");
btnSub = new JButton("-");
btnTimes = new JButton("*");
btnDiv = new JButton("/");
btnDot = new JButton(".");
btnEquals = new JButton("=");
centerPanel.add(btn7);
centerPanel.add(btn8);
centerPanel.add(btn9);
centerPanel.add(btnDiv);
centerPanel.add(btn4);
centerPanel.add(btn5);
centerPanel.add(btn6);
centerPanel.add(btnTimes);
centerPanel.add(btn1);
centerPanel.add(btn2);
centerPanel.add(btn3);
centerPanel.add(btnSub);
centerPanel.add(btn0);
centerPanel.add(btnDot);
centerPanel.add(btnEquals);
centerPanel.add(btnAdd);
add(southPanel,BorderLayout.SOUTH);
btnClear = new JButton("清除");
btnExit = new JButton("关闭");
southPanel.add(btnClear);
southPanel.add(btnExit);
//监听
btn0.addActionListener(this);
btn1.addActionListener(this);
btn2.addActionListener(this);
btn3.addActionListener(this);
btn4.addActionListener(this);
btn5.addActionListener(this);
btn6.addActionListener(this);
btn7.addActionListener(this);
btn8.addActionListener(this);
btn9.addActionListener(this);
btnAdd.addActionListener(this);
btnSub.addActionListener(this);
btnTimes.addActionListener(this);
btnDiv.addActionListener(this);
btnDot.addActionListener(this);
btnEquals.addActionListener(this);
btnClear.addActionListener(this);
btnExit.addActionListener(this);
setSize(300, 300);
setVisible(true);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new Calc();
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==btnClear){
txtResult.setText("0");
}else if(e.getSource()==btnExit){
System.exit(0);
}else if(e.getSource()==btn0){
setText("0");
}else if(e.getSource()==btn1){
setText("1");
}else if(e.getSource()==btn2){
setText("2");
}else if(e.getSource()==btn3){
setText("3");
}else if(e.getSource()==btn4){
setText("4");
}else if(e.getSource()==btn5){
setText("5");
}else if(e.getSource()==btn6){
setText("6");
}else if(e.getSource()==btn7){
setText("7");
}else if(e.getSource()==btn8){
setText("8");
}else if(e.getSource()==btn9){
setText("9");
}else if(e.getSource()==btnDot){
setText(".");
}else if(e.getSource()==btnAdd){
opr = "+";
operator();
//清空内容
txtResult.setText("");
}else if(e.getSource()==btnSub){
opr = "-";
operator();
//清空内容
txtResult.setText("");
}else if(e.getSource()==btnTimes){
opr = "*";
operator();
//清空内容
txtResult.setText("");
}else if(e.getSource()==btnDiv){
opr = "/";
operator();
//清空内容
txtResult.setText("");
}else if(e.getSource()==btnEquals){
operator();
txtResult.setText(result+"");
num1=num2=result=0;
}
}
public void setText(String s){
//获取文本框的值
String str = txtResult.getText().trim();
//如果文本框里面的值是0，那么初始化为空值
if(str.equals("" ) || Double.parseDouble(str)==0){
str = "";
}
str += s;
//设置文本框的值
txtResult.setText(str);
}
public void operator(){
if(txtResult.getText().equals("")){
num1=0;
}else{
num1 = Double.parseDouble(txtResult.getText().trim());
}
System.out.println("num1="+num1+";num2="+num2);
if(opr.equals("+")){
result = num1+num2;
}else if(opr.equals("-")){
result = num2-num1;
}else if(opr.equals("*")){
result = num1*num2;
}else if(opr.equals("/")){
result = num2/num1;
}
num2=num1;
}
String m_temp;
public void keyPressed(KeyEvent e) {
m_temp = txtResult.getText();
}
public void keyReleased(KeyEvent e) {
try{
Double.parseDouble(txtResult.getText());
}catch(Exception ex){
txtResult.setText(m_temp);
}
}
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
}
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