目前代码是这样的
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame implements ActionListener{
JFrame f = new JFrame("计算器");
JTextField tf = new JTextField(18);
JButton b0 = new JButton("7");
JButton b1 = new JButton("8");
JButton b2 = new JButton("9");
JButton b3 = new JButton("X");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("-");
JButton b8 = new JButton("1");
JButton b9 = new JButton("2");
JButton b10 = new JButton("3");
JButton b11 = new JButton("+");
JButton b12 = new JButton("+/-");
JButton b13 = new JButton("0");
JButton b14 = new JButton(".");
JButton b15 = new JButton("=");
JButton b16 = new JButton("%");
JButton b17 = new JButton("÷");
JButton b18 = new JButton("x²");
JButton b19 = new JButton("x³");
JButton b20 = new JButton("√");
JButton b21 = new JButton("c");
JButton b22 = new JButton("←");
JButton b23 = new JButton("ce");
JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
JPanel p3 = new JPanel();
JPanel p4 = new JPanel();
JPanel p5 = new JPanel();
JPanel p6 = new JPanel();
String nowButton;
class MyListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
nowButton = arg0.getActionCommand();
if(arg0.getActionCommand().equals("=")){
tf.setText("");
}
if(arg0.getActionCommand().equals("c")){
tf.setText("");
}
if (arg0.getActionCommand().equals("←")) {
tf.setText(tf.getText() + nowButton);
}
}
}
private void init() {
tf.setHorizontalAlignment(JTextField.RIGHT);
p1.add(b23);
p1.add(b17);
p1.add(b21);
p1.add(b22);
p2.add(b0);
p2.add(b1);
p2.add(b2);
p2.add(b3);
p3.add(b4);
p3.add(b5);
p3.add(b6);
p3.add(b7);
p4.add(b8);
p4.add(b9);
p4.add(b10);
p4.add(b11);
p5.add(b12);
p5.add(b13);
p5.add(b14);
p5.add(b15);
p6.add(b16);
p6.add(b18);
p6.add(b19);
p6.add(b20);
Box box1 = Box.createVerticalBox();
box1.add(p1);
box1.add(p2);
box1.add(p3);
box1.add(p4);
box1.add(p5);
box1.add(p6);
f.add(tf,BorderLayout.NORTH);
f.add(box1,BorderLayout.SOUTH);
f.addWindowListener(new WindowAdapter(){
@Override
public void windowClosing(WindowEvent arg0) {
// TODO Auto-generated method stub
super.windowClosing(arg0);
System.exit(0);
}
});
f.pack();
f.setVisible(true);
}
public static void main(String[] args) {
new Calculator().init();
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
}
}
package 计算器;
//只能做整数运算，且还没有解决被除数为零时的情况，被除数为零时，会报错
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Demo extends JFrame {
int temp1 = 0;
int temp2 = 0;
int ii = 0;
String jbs;
JTextField jtf;
int countnumber = 0;
String countcount = "";
String[] numberarr = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0" };
String[] countarr = { "+", "-", "*", "/" };
String c = "C";
String dengyu = "=";
public Demo() {
setTitle("计算器");
Dimension dsize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds((int) (dsize.getWidth() / 2 - 260 / 2), (int) (dsize.getHeight() / 2 - 200 / 2), 200, 210);
JPanel jp = new JPanel();
this.setContentPane(jp);
jtf = new JTextField(17);
add(jtf);
JButton jbc = new JButton(c);
jp.add(jbc);
jbc.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jtf.setText("");
countcount = "";
countnumber = 0;
ii = 0;
}
});
for (int i = 0; i < numberarr.length; i++) {
final JButton jb = new JButton(numberarr[i]);
jp.add(jb);
jb.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String s = jb.getText();
jtf.setText(jtf.getText() + s);
}
});
}
JButton jbdengyu = new JButton(dengyu);
jbdengyu.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
numberCount2("=");
countcount = "";
countnumber = 0;
ii = 0;
}
});
jp.add(jbdengyu);
for (int i = 0; i < countarr.length; i++) {
final JButton jbcount = new JButton(countarr[i]);
jp.add(jbcount);
jbcount.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
jbs = jbcount.getText();
jtf.setText(jtf.getText() + jbs);
if (countnumber == 0) {
numberCount1(jbs);
} else if (countnumber >= 1) {
numberCount2(jbs);
}
}
});
}
this.setResizable(false);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new Demo();
}
private void numberCount1(String jbs) {
String temps = "";
String arr = jtf.getText();
temps = arr.substring(0, arr.length()-1);
temp1 = Integer.parseInt(temps);
countcount = jbs;
countnumber++;
ii = arr.length()-1;
}
private void numberCount2(String jbs) {
String ss;
if(jbs == "=") {
ss = jtf.getText().substring(ii + 1, jtf.getText().length());
}else {
ss = jtf.getText().substring(ii + 1, jtf.getText().length()-1);
}
temp2 = Integer.parseInt(ss);
switch (countcount) {
case "+":
if(jbs != "=") {
jtf.setText(String.valueOf((temp1 + temp2)) + jbs);
numberCount3(jbs);
countnumber++;
}else {
jtf.setText(String.valueOf((temp1 + temp2)));
}
break;
case "-":
if(jbs != "=") {
jtf.setText(String.valueOf((temp1 - temp2)) + jbs);
numberCount3(jbs);
countnumber++;
}else {
jtf.setText(String.valueOf((temp1 - temp2)));
}
break;
case "*":
if(jbs != "=") {
jtf.setText(String.valueOf((temp1 * temp2)) + jbs);
numberCount3(jbs);
countnumber++;
}else {
jtf.setText(String.valueOf((temp1 * temp2)));
}
break;
case "/":
if(jbs != "=") {
jtf.setText(String.valueOf((temp1 / temp2)) + jbs);
numberCount3(jbs);
countnumber++;
}else {
jtf.setText(String.valueOf((temp1 / temp2)));
}
break;
default:
break;
}
}
private void numberCount3(String jbs) {
String newtext = jtf.getText();
temp1 = Integer.parseInt(newtext.substring(0, newtext.length()-1));
ii = newtext.length()-1;
countcount = jbs;
}
}
我自己写的，你参考一下吧，具体思路我也不知道怎么说，大概是用一个数去记录当前文本框里的运算符，再没有碰见等于号或者C键时，就不进行运算，一旦有两个运算符出现，就先运算前面两个数，用结果加上第二个运算符显示在文本框中