package com.Eyou.demo;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
@SuppressWarnings("serial")
public class Demo extends JFrame{
//设置窗体
private JPanel contentPane;
//设置文本输入框
private JTextField jt;
//数字按钮
JButton jb1,jb2,jb3,jb4,jb5,jb6,jb7,jb8,jb9,jb0,jb,j1,j2,j3,j4,j5;
private boolean opflag = false; //用于标识是否输入运算操作符
private String txt = null; //显示结果的文本框的文本内容，用于存放计算结果的字符串形式
private String num_txt = "";
private boolean numflag = false; //用于标识是否输入数字
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Demo frame = new Demo();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Demo() {
swing();
ActionListener();
judgeAction();
jt.setFont(new Font("宋体",Font.BOLD,80));
jt.setEditable(false);
}
private void judgeAction() {
//写减一的判断方法
j1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String s=jt.getText();
//截取最后一个字符串
int a=s.length();
String t=s.substring(0, a-1);
jt.setText(t);
}
});
//写退出的方法
j2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
}
});
//写清除的方法
j3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jt.setText("");
}
});
//写归零的方法
j4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jt.setText("00");
}
});
//写校正的方法 .只能输入11位
j5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//获取字符串，再把转成合适的格式
String t=jt.getText();
if(t.length()>11){
//把多余的截取
String str=t.substring(0, 11);
jt.setText(str);
}
//使用
}
});
}
/**
* 确定点击按钮事件，然后将数字显示到页面上
* 输入的一串数字连续
*/
//都是独立的事件
private void ActionListener() {
jb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("1");
}
});
jb2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("2");
}
});
jb3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("3");
}
});
jb4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("4");
}
});
jb5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("5");
}
});
jb6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("6");
}
});
jb7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("7");
}
});
jb8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("8");
}
});
jb9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("9");
}
});
jb0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("0");
}
});
jb.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
numAction("00");
}
});
}
public void numAction(String string) {
if(num_txt == "" && opflag == false) { //判断是否num_txt是否为空，opflag是否为false，若满足这两个
jt.setText(null); //条件，则为一次运算完毕，切新运算不以该次结果继续做运算。
num_txt = "";
}
numflag = true; //只要输入一个数，则把numflag置为true，表示已有数字输入
num_txt += string; //把输入的数加入到最终要转换成都double运算的字符串
txt = jt.getText() + string; //加到txt，使输入的数显示到文本框中。
jt.setText(txt);
}
private void swing() {
setTitle("\u6D4B\u8BD5");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 698, 711);
contentPane = new JPanel();
contentPane.setBackground(Color.ORANGE);
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JPanel panel = new JPanel();
panel.setBackground(Color.PINK);
panel.setForeground(Color.RED);
panel.setBounds(30, 10, 630, 653);
contentPane.add(panel);
panel.setLayout(null);
jb1 = new JButton("1");
jb1.setForeground(Color.RED);
jb1.setFont(new Font("Andalus", Font.BOLD, 60));
jb1.setBounds(31, 237, 133, 115);
panel.add(jb1);
jb2 = new JButton("2");
jb2.setForeground(Color.RED);
jb2.setFont(new Font("Andalus", Font.BOLD, 60));
jb2.setBounds(174, 237, 133, 115);
panel.add(jb2);
jb3 = new JButton("3");
jb3.setForeground(Color.RED);
jb3.setFont(new Font("Andalus", Font.BOLD, 60));
jb3.setBounds(317, 237, 133, 115);
panel.add(jb3);
jb4 = new JButton("4");
jb4.setForeground(Color.RED);
jb4.setFont(new Font("Andalus", Font.BOLD, 60));
jb4.setBounds(31, 375, 133, 115);
panel.add(jb4);
jb5= new JButton("5");
jb5.setForeground(Color.RED);
jb5.setFont(new Font("Andalus", Font.BOLD, 60));
jb5.setBounds(174, 375, 133, 115);
panel.add(jb5);
jb6 = new JButton("6");
jb6.setForeground(Color.RED);
jb6.setFont(new Font("Andalus", Font.BOLD, 60));
jb6.setBounds(317, 375, 133, 115);
panel.add(jb6);
jb7 = new JButton("7");
jb7.setForeground(Color.RED);
jb7.setFont(new Font("Andalus", Font.BOLD, 60));
jb7.setBounds(31, 510, 133, 115);
panel.add(jb7);
jb8= new JButton("8");
jb8.setForeground(Color.RED);
jb8.setFont(new Font("Andalus", Font.BOLD, 60));
jb8.setBounds(174, 510, 133, 115);
panel.add(jb8);
jb9 = new JButton("9");
jb9.setForeground(Color.RED);
jb9.setFont(new Font("Andalus", Font.BOLD, 60));
jb9.setBounds(317, 510, 133, 115);
panel.add(jb9);
jt = new JTextField();
jt.setBounds(31, 35, 562, 115);
panel.add(jt);
jt.setColumns(10);
j1 = new JButton("减一");
j1.setForeground(Color.BLUE);
j1.setFont(new Font("宋体", Font.PLAIN, 50));
j1.setBounds(31, 160, 133, 68);
j1.setMargin(new Insets(0, 0, 0, 0));
panel.add(j1);
j2 = new JButton("退出");
j2.setForeground(Color.BLUE);
j2.setFont(new Font("宋体", Font.PLAIN, 50));
j2.setBounds(174, 160, 133, 68);
j2.setMargin(new Insets(0, 0, 0, 0));
panel.add(j2);
j3= new JButton("清除");
j3.setForeground(Color.BLUE);
j3.setFont(new Font("宋体", Font.PLAIN, 50));
j3.setBounds(317, 160, 133, 68);
j3.setMargin(new Insets(0, 0, 0, 0));
panel.add(j3);
jb0 = new JButton("0");
jb0.setForeground(Color.RED);
jb0.setFont(new Font("Andalus", Font.BOLD, 60));
jb0.setBounds(460, 510, 133, 115);
panel.add(jb0);
jb = new JButton("00");
jb.setForeground(Color.RED);
jb.setFont(new Font("宋体", Font.PLAIN, 60));
jb.setBounds(460, 375, 133, 115);
panel.add(jb);
j4 = new JButton("归零");
j4.setForeground(Color.BLUE);
j4.setFont(new Font("宋体", Font.PLAIN, 50));
j4.setBounds(460, 238, 133, 115);
j4.setMargin(new Insets(0, 0, 0, 0));
panel.add(j4);
j5 = new JButton("校正");
j5.setForeground(Color.BLUE);
j5.setFont(new Font("宋体", Font.PLAIN, 50));
j5.setBounds(460, 160, 133, 68);
j5.setMargin(new Insets(0, 0, 0, 0));
panel.add(j5);
JPanel panel_1 = new JPanel();
panel_1.setBackground(Color.CYAN);
panel_1.setBounds(26, 160, 567, 464);
panel.add(panel_1);
}
}本人代码
修改你的JPanel的布局管理器
默认的JPanel的布局管理器是FlowLayout，当容器变化时组件相对位置改变，但其大小不变