Java Swing中添加图标、对话框、分割线、信息提示、面板的使用

(一).JLabel、JButton、JFrame、JPane等可以设置图标，接下来代码演示一下

package com.Swing;
import java.awt.*;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

class IconDemo {
    IconDemo() {
        JFrame f = new JFrame();
        //使用ImageIO也可以获取image
        Image image = Toolkit.getDefaultToolkit().getImage("D:\\1.jpg");

        JLabel label=new JLabel();
        label.setSize(390,390);
        label.setIcon( new ImageIcon(image));
        f.add(label);
        f.setIconImage(image);
        f.setLayout(null);
        f.setSize(400, 400);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }

    public static void main(String args[]) {
        new IconDemo();
    }
}

输出

(二).对话框常用方法的使用

1. showMessageDialog(Component parentComponent, Object message)
2. showMessageDialog(Component parentComponent, Object message, String title, int messageType)
3. showConfirmDialog(Component parentComponent, Object message)
4. showInputDialog(Component parentComponent, Object message)

(三)代码演示

1.比如登录账号后的提示

package com.Swing;
import javax.swing.*;  
public class OptionPaneDemo1 {  
JFrame f;  
OptionPaneDemo1(){  
    f=new JFrame();  
    JOptionPane.showMessageDialog(f,"账号登录成功！！！");  
}  
public static void main(String[] args) {  
    new OptionPaneDemo1();  
}  
}  

2.比如登录有误的提示

package com.Swing;

import javax.swing.*;

public class OptionPaneDemo2{
    JFrame f;

    OptionPaneDemo1() {
        f = new JFrame();
        JOptionPane.showMessageDialog(f, "账号或密码错误，请重新输入...", "Alert", JOptionPane.WARNING_MESSAGE);
    }

    public static void main(String[] args) {
        new OptionPaneDemo1();
    }
}

3.输入对话框

package com.Swing;
import javax.swing.*;
public class OptionPaneDemo3 {
    JFrame f;
    OptionPaneDemo1() {
        f = new JFrame();
        String name = JOptionPane.showInputDialog(f,"请输入姓名");
    }

    public static void main(String[] args) {
        new OptionPaneDemo1();
    }
}

4.确认对话框的使用

package com.Swing;

import javax.imageio.ImageIO;
import javax.swing.*;

import java.awt.Image;
import java.awt.event.*;
import java.io.File;
import java.io.IOException;

public class OptionPaneDemo4 extends WindowAdapter {
    JFrame f;
    JLabel label;
    ImageIO imageIO;
    Image image;
    OptionPaneDemo1() throws IOException {
        f = new JFrame();
        label=new JLabel(); 
        label.setSize(400, 400);
        image=ImageIO.read(new File("D:\\4.jpg"));
        label.setIcon(new ImageIcon(image));
        f.setIconImage(image);
        f.add(label);
        f.addWindowListener(this);
        f.setSize(400, 400);
        f.setLayout(null);
        f.setLocationRelativeTo(null);
        f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        f.setVisible(true);
    }

    public void windowClosing(WindowEvent e) {
        int a = JOptionPane.showConfirmDialog(f, "是否退出系统?");
        if (a == JOptionPane.YES_OPTION) {
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        }
    }

    public static void main(String[] args) throws IOException {
        new OptionPaneDemo1();
    }
}

(四)分割线在菜单项中的使用

package com.Swing;
import javax.swing.*;
class SeparatorDemo {
    JMenu menu, submenu;
    JMenuItem i1, i2, i3, i4, i5;

    SeparatorDemo() {
        JFrame f = new JFrame("演示");
        JMenuBar mb = new JMenuBar();
        menu = new JMenu("文件");
        i1 = new JMenuItem("新建文件");
        i2 = new JMenuItem("打开文件");
        i3 = new JMenuItem("关闭");
        i4 = new JMenuItem("保存");
        i5 = new JMenuItem("打印");
        menu.add(i1);
        menu.addSeparator();
        menu.add(i2);
        menu.addSeparator();
        menu.add(i3);
        menu.addSeparator();
        menu.add(i4);
        menu.addSeparator();
        menu.add(i5);

        mb.add(menu);
        f.setJMenuBar(mb);
        f.setSize(400, 400);
        f.setLocationRelativeTo(null);
        f.setLayout(null);
        f.setVisible(true);
    }

    public static void main(String args[]) {
        new SeparatorDemo();
    }
}

(五)信息提示

package com.Swing;

import javax.swing.*;

public class TooltipsDemo {
    public static void main(String[] args) {
        JFrame f = new JFrame("演示");
        JPasswordField value = new JPasswordField();
        value.setBounds(60, 100, 140, 30);
        value.setToolTipText("输入密码");
        JLabel l1 = new JLabel("密码:");
        l1.setBounds(20, 100, 80, 30);

        f.add(value);
        f.add(l1);
        f.setSize(300, 300);
        f.setLocationRelativeTo(null);
        f.setLayout(null);
        f.setVisible(true);
    }
}

(六)面板的使用

面板可以添加组件，设置组件在面板上的位置和大小，设置好以后再将面板添加到JFrame中。

package com.Swing;
import java.awt.*;  
import javax.swing.*;  
public class JPaneDemo {  
    JPaneDemo() {
        JFrame f = new JFrame("演示");
        JPanel panel = new JPanel();
        panel.setBounds(90, 80, 200, 200);
        panel.setBackground(Color.gray);
        JButton b1 = new JButton("登录");
        b1.setBounds(50, 100, 80, 30);
        b1.setBackground(Color.GREEN);
        JButton b2 = new JButton("退出");
        b2.setBounds(100, 100, 80, 30);
        b2.setBackground(Color.RED);
        panel.add(b1);
        panel.add(b2);
        f.add(panel);
        f.setSize(400, 400);
        f.setLocationRelativeTo(null);
        f.setLayout(null);
        f.setVisible(true);
    }  
        public static void main(String args[])  
        {  
        new JPaneDemo();  
        }  
    }  

输出：