代码：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package calculater;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
/**
* GUI计算器
* @author Administrator
*
*/
/**
*
* @author Administrator
*/
public class Calculater {
static float sum = 0f;
String s1;
private JFrame frame;
private JTextField textField;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Calculater window = new Calculater();
window.frame.setVisible(true);
window.frame.setTitle("Calculater");
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Calculater() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 500, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JButton btnNewButton = new JButton("1");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
textField.setText(textField.getText()+1);
}
});
btnNewButton.setBounds(70, 265, 50, 26);
frame.getContentPane().add(btnNewButton);
JButton button = new JButton("2");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+2);
}
});
button.setBounds(144, 265, 50, 26);
frame.getContentPane().add(button);
JButton button_1 = new JButton("3");
button_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+3);
}
});
button_1.setBounds(221, 265, 50, 26);
frame.getContentPane().add(button_1);
JButton button_2 = new JButton("4");
button_2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+4);
}
});
button_2.setBounds(70, 304, 50, 26);
frame.getContentPane().add(button_2);
JButton button_3 = new JButton("5");
button_3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+5);
}
});
button_3.setBounds(144, 304, 50, 26);
frame.getContentPane().add(button_3);
JButton button_4 = new JButton("6");
button_4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+6);
}
});
button_4.setBounds(221, 304, 50, 26);
frame.getContentPane().add(button_4);
JButton button_5 = new JButton("7");
button_5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+7);
}
});
button_5.setBounds(70, 339, 50, 26);
frame.getContentPane().add(button_5);
JButton button_6 = new JButton("8");
button_6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+8);
}
});
button_6.setBounds(144, 339, 50, 26);
frame.getContentPane().add(button_6);
JButton button_7 = new JButton("9");
button_7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+9);
}
});
button_7.setBounds(221, 339, 50, 26);
frame.getContentPane().add(button_7);
//加法///////////////////////////////////////////////////////////////////
JButton button_8 = new JButton("+");
button_8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+" + ");
//加
String str = textField.getText();
String [] stringArr= str.split((" "));
if(stringArr.length == 2) {
float i = Float.valueOf(stringArr[0]);
sum = i;
}
else if(stringArr[stringArr.length-3].equals("+")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum+i;
}
else if(stringArr[stringArr.length-3].equals("-")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum-i;
}
else if(stringArr[stringArr.length-3].equals("*")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum*i;
}
else if(stringArr[stringArr.length-3].equals("/")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum/i;
}
else if(stringArr[stringArr.length-3].equals("^")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = (float) Math.pow(sum, i);
}
}
});
button_8.setBounds(293, 265, 50, 26);
frame.getContentPane().add(button_8);
//减法//////////////////////////////////////////////////////////////////////////
JButton button_9 = new JButton("-");
button_9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+" - ");
//减
String str = textField.getText();
String [] stringArr= str.split((" "));
if(stringArr.length == 2) {
float i = Float.valueOf(stringArr[0]);
sum = i;
}
else if(stringArr[stringArr.length-3].equals("+")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum+i;
}
else if(stringArr[stringArr.length-3].equals("-")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum-i;
}
else if(stringArr[stringArr.length-3].equals("*")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum*i;
}
else if(stringArr[stringArr.length-3].equals("/")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum/i;
}
else if(stringArr[stringArr.length-3].equals("^")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = (float) Math.pow(sum, i);
}
}
});
button_9.setBounds(293, 304, 50, 26);
frame.getContentPane().add(button_9);
//乘法//////////////////////////////////////////////////////////////////
JButton button_10 = new JButton("*");
button_10.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+" * ");
String str = textField.getText();
String [] stringArr= str.split((" "));
if(stringArr.length == 2) {
float i = Float.valueOf(stringArr[0]);
sum = i;
}
else if(stringArr[stringArr.length-3].equals("+")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum+i;
}
else if(stringArr[stringArr.length-3].equals("-")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum-i;
}
else if(stringArr[stringArr.length-3].equals("*")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum*i;
}
else if(stringArr[stringArr.length-3].equals("/")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum/i;
}
else if(stringArr[stringArr.length-3].equals("^")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = (float) Math.pow(sum, i);
}
}
});
button_10.setBounds(293, 339, 50, 26);
frame.getContentPane().add(button_10);
JButton button_11 = new JButton("0");
button_11.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+0);
}
});
button_11.setBounds(144, 380, 50, 26);
frame.getContentPane().add(button_11);
JButton button_22= new JButton("!");
button_22.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String s=textField.getText();
int s1=Integer.parseInt(s);
long j=1;
for(int i=1;i<=s1;i++)
j*=i;
textField.setText(textField.getText()+"!="+j);
}
});
button_22.setBounds(70, 380, 50, 26);
frame.getContentPane().add(button_22);
JButton btn21 = new JButton("<<<");
btn21.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String s=textField.getText();
textField.setText(s.substring(0, s.length()-1));
}
});
btn21.setBounds(221, 380, 50, 26);
frame.getContentPane().add(btn21);
//除法//////////////////////////////////////////////////////////////////
JButton button_12 = new JButton("/");
button_12.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+" / ");
String str = textField.getText();
String [] stringArr= str.split((" "));
if(stringArr.length == 2) {
float i = Float.valueOf(stringArr[0]);
sum = i;
}
else if(stringArr[stringArr.length-3].equals("+")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum+i;
}
else if(stringArr[stringArr.length-3].equals("-")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum-i;
}
else if(stringArr[stringArr.length-3].equals("*")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum*i;
}
else if(stringArr[stringArr.length-3].equals("/")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum/i;
}
else if(stringArr[stringArr.length-3].equals("^")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = (float) Math.pow(sum, i);
}
}
});
button_12.setBounds(293, 380, 50, 26);
frame.getContentPane().add(button_12);
JButton button_18 = new JButton("^");
button_18.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+" ^ ");
String str = textField.getText();
String [] stringArr= str.split((" "));
if(stringArr.length == 2) {
float i = Float.valueOf(stringArr[0]);
sum = i;
}
else if(stringArr[stringArr.length-3].equals("+")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum+i;
}
else if(stringArr[stringArr.length-3].equals("-")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum-i;
}
else if(stringArr[stringArr.length-3].equals("*")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum*i;
}
else if(stringArr[stringArr.length-3].equals("/")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum/i;
}
else if(stringArr[stringArr.length-3].equals("^")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = (float) Math.pow(sum, i);
}
}
});
button_18.setBounds(364, 380, 50, 26);
frame.getContentPane().add(button_18);
JButton button_13 = new JButton("=");
button_13.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText()+" = ");
String str = textField.getText();
String [] stringArr= str.split((" "));
if(stringArr.length == 2) {
float i = Float.valueOf(stringArr[0]);
sum = i;
textField.setText(textField.getText()+sum);
}
else if(stringArr[stringArr.length-3].equals("+")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum+i;
textField.setText(textField.getText()+sum);
}
else if(stringArr[stringArr.length-3].equals("-")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum-i;
textField.setText(textField.getText()+sum);
}
else if(stringArr[stringArr.length-3].equals("*")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum*i;
textField.setText(textField.getText()+sum);
}
else if(stringArr[stringArr.length-3].equals("/")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = sum/i;
textField.setText(textField.getText()+sum);
}
else if(stringArr[stringArr.length-3].equals("^")) {
float i = Float.valueOf(stringArr[stringArr.length-2]);
sum = (float) Math.pow(sum,i);
textField.setText(textField.getText()+sum);
}
}
});
button_13.setBounds(364, 265, 50, 26);
frame.getContentPane().add(button_13);
textField = new JTextField();
textField.setBounds(70, 130, 344, 79);
frame.getContentPane().add(textField);
textField.setColumns(10);
JButton btnC = new JButton("C");
btnC.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
textField.setText("");
sum = 0;
}
});
btnC.setBounds(364, 304, 50, 26);
frame.getContentPane().add(btnC);
JButton button_14 = new JButton(".");
button_14.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
textField.setText(textField.getText()+".");
}
});
button_14.setBounds(364, 341, 50, 26);
frame.getContentPane().add(button_14);
}
}
运行页面：