第二十章《Java Swing》第7节：对话框

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Exam20_22Frame extends JFrame{
JButton[] buttons;
public Exam20_22Frame(){
init();
}
private void init( ){
Container container = this.getContentPane();
container.setLayout(null);
buttons = new JButton[3];
buttons[0] = new JButton("对话框1");
buttons[1] = new JButton("对话框2");
buttons[2] = new JButton("对话框3");
for(int i=0;i<buttons.length;i++){
buttons[i].setSize(200, 40);
buttons[i].setLocation(50, i*60+20);
buttons[i].setFont(new Font("微软雅黑", Font.PLAIN, 20));
container.add(buttons[i]);
}
buttons[0].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//弹出消息对话框，仅设置消息
JOptionPane.showMessageDialog(Exam20_22Frame.this,
"您的会员资格将于3天后到期");
}
});

buttons[1].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//弹出消息对话框，设置消息、标题、消息类型
JOptionPane.showMessageDialog(Exam20_22Frame.this,
"您的会员资格将于3天后到期","会员到期提醒",JOptionPane.WARNING_MESSAGE);
}
});
buttons[2].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//弹出消息对话框，设置消息、标题、消息类型、图标
JOptionPane.showMessageDialog(Exam20_22Frame.this,
"您的会员资格将于3天后到期","会员到期提醒",JOptionPane.WARNING_MESSAGE,
new ImageIcon("a.png"));
}
});
}
}
public class Exam20_22 {
public static void main(String[] args) {
Exam20_22Frame frame = new Exam20_22Frame();
frame.setSize(320, 250);
frame.setLocationRelativeTo(null);
frame.setTitle("Exam20_22Frame");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Exam20_23Frame extends JFrame{
JButton button;
public Exam20_23Frame(){
init();
}
private void init( ){
Container container = this.getContentPane();
container.setLayout(null);
button = new JButton("确认对话框1");
button.setSize(200, 40);
button.setLocation(50,20);
button.setFont(new Font("微软雅黑", Font.PLAIN, 20));
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//弹出确认对话框，设置对话框文本、标题、按钮组合
JOptionPane.showConfirmDialog(Exam20_23Frame.this,
"在关闭前是否保存文档？","关闭文档提示",JOptionPane.YES_NO_CANCEL_OPTION);
}
});
container.add(button);
}
}
public class Exam20_23 {
public static void main(String[] args) {
Exam20_23Frame frame = new Exam20_23Frame();
frame.setSize(320, 150);
frame.setLocationRelativeTo(null);
frame.setTitle("Exam20_23Frame");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Exam20_24Frame extends JFrame{
JButton button;
public Exam20_24Frame(){
init();
}
private void init( ){
Container container = this.getContentPane();
container.setLayout(null);
button = new JButton("输入对话框");
button.setSize(200, 40);
button.setLocation(50,20);
button.setFont(new Font("微软雅黑", Font.PLAIN, 20));
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//弹出输入对话框
Object input = JOptionPane.showInputDialog(Exam20_24Frame.this,
"请问你想要什么礼物？","选择礼物", JOptionPane.QUESTION_MESSAGE, null,
new String[]{"iPhone","iPad","ice cream"}, "iPad");
}
});
container.add(button);
}
}
public class Exam20_24 {
public static void main(String[] args) {
Exam20_24Frame frame = new Exam20_24Frame();
frame.setSize(320, 150);
frame.setLocationRelativeTo(null);
frame.setTitle("Exam20_24Frame");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Exam20_25Frame extends JFrame{
JButton button;
public Exam20_25Frame(){
init();
}
private void init( ){
Container container = this.getContentPane();
container.setLayout(null);
button = new JButton("内部信息对话框");
button.setSize(200, 40);
button.setLocation(50,20);
button.setFont(new Font("微软雅黑", Font.PLAIN, 20));
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//弹出内部信息对话框
JOptionPane.showInternalMessageDialog(container, "内部信息对话框");
}
});
container.add(button);
}
}
public class Exam20_25{
public static void main(String[] args) {
Exam20_25Frame frame = new Exam20_25Frame();
frame.setSize(320, 150);
frame.setLocationRelativeTo(null);
frame.setTitle("Exam20_25Frame");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//自定义对话框类
class MyDialog extends JDialog{
JTextField txtUserName;
JPasswordField pwdPassword;
JButton btnOk,btnCancel;
JLabel lblUserName, lblPassword;
String value = null;
public MyDialog(Frame owner, String title){
super(owner, title);
init();
}
private void init( ){
Container container = this.getContentPane();
container.setLayout(null);
txtUserName = new JTextField();
pwdPassword = new JPasswordField();
btnOk = new JButton("确定");
btnCancel = new JButton("取消");
lblUserName = new JLabel("用户名");
lblPassword = new JLabel("密 码");
this.setSize(300,200);
this.setLocationRelativeTo(null);

lblUserName.setSize(80, 30);
lblUserName.setLocation(30, 20);
lblUserName.setFont(new Font("微软雅黑", Font.PLAIN, 20));
txtUserName.setSize(140, 30);
txtUserName.setLocation(110, 20);
txtUserName.setFont(new Font("微软雅黑", Font.PLAIN, 20));
lblPassword.setSize(80, 30);
lblPassword.setLocation(30, 60);
lblPassword.setFont(new Font("微软雅黑", Font.PLAIN, 20));
pwdPassword.setSize(140, 30);
pwdPassword.setLocation(110, 60);
pwdPassword.setFont(new Font("微软雅黑", Font.PLAIN, 20));
btnOk.setSize(80, 30);
btnOk.setLocation(50, 100);
btnOk.setFont(new Font("微软雅黑", Font.PLAIN, 20));
btnOk.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//获取用户填写的用户名和密码并赋值给value
value = "用户名："+txtUserName.getText()
+"密码："+new String(pwdPassword.getPassword());
//关闭对话框
MyDialog.this.dispose();
}
});
btnCancel.setSize(80, 30);
btnCancel.setLocation(150, 100);
btnCancel.setFont(new Font("微软雅黑", Font.PLAIN, 20));
btnCancel.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
MyDialog.this.dispose();
}
});
container.add(txtUserName);
container.add(pwdPassword);
container.add(btnOk);
container.add(btnCancel);
container.add(lblUserName);
container.add(lblPassword);
//设置为模态对话框
this.setModal(true);
this.setVisible(true);
}
//返回用户填写的信息
public String getValue(){
return value;
}
}
//窗体类
class Exam20_26Frame extends JFrame{
JButton button;
public Exam20_26Frame(){
init();
}
private void init( ){
Container container = this.getContentPane();
container.setLayout(null);
button = new JButton("自定义对话框");
button.setSize(200, 40);
button.setLocation(50,20);
button.setFont(new Font("微软雅黑", Font.PLAIN, 20));
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//弹出内部信息对话框
MyDialog myDialog = new MyDialog(Exam20_26Frame.this,"自定义对话框");
//当对话框关闭后执行getValue()方法
String input = myDialog.getValue();
System.out.println(input);
}
});
container.add(button);
}
}
public class Exam20_26 {
public static void main(String[] args) {
Exam20_26Frame frame = new Exam20_26Frame();
frame.setSize(320, 150);
frame.setLocationRelativeTo(null);
frame.setTitle("Exam20_26Frame");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}