Java程序图形用户界面设计之按钮与布局

目录

• 按钮组件 JButton
• JButton类常用方法
• 按钮上显示图片
• 布局管理器
• FlowLayout
• BorderLayout
• GridLayout
• CardLayout
• 绝对定位

import javax.swing.*;
import java.awt.*;

public class Hello {
    public static void main(String[] args) {
        JFrame frame = new JFrame("一");
        JButton but = new JButton("点击");
        Font font = new Font("Serief",Font.BOLD,25);
        but.setFont(font);
        frame.add(but);
        frame.setSize(200,70);
        frame.setLocation(500,300);
        frame.setVisible(true);
    }
}

import javax.swing.*;

public class Hello {
    public static void main(String[] args) {
        JFrame frame = new JFrame("一");
        String Path="C:\\Users\\30452\\Desktop\\123.jpg";
        Icon icon = new ImageIcon(Path,"MLDN");
        JButton but = new JButton(icon);
        frame.add(but);
        frame.setSize(500,600);
        frame.setLocation(300,200);
        frame.setVisible(true);
    }
}

import javax.swing.*;
import java.awt.*;

public class Hello {
    public static void main(String[] args) {
        JFrame frame = new JFrame("一");
        frame.setLayout(new FlowLayout(FlowLayout.CENTER,4,4));
        JButton but = null;
        for(int i=0;i<16;i++){
            but = new JButton("按钮");
            frame.add(but);
        }
        frame.setSize(300,300);
        frame.setVisible(true);
    }
}

import javax.swing.*;
import java.awt.*;

public class Hello {
    public static void main(String[] args) {
        JFrame frame = new JFrame("一");
        frame.setLayout(new BorderLayout(3,3));
        frame.add(new JButton("上"),BorderLayout.NORTH);
        frame.add(new JButton("下"),BorderLayout.SOUTH);
        frame.add(new JButton("左"),BorderLayout.WEST);
        frame.add(new JButton("右"),BorderLayout.EAST);
        frame.add(new JButton("中"),BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
    }
}

import javax.swing.*;
import java.awt.*;

public class Hello {
    public static void main(String[] args) {
        JFrame frame = new JFrame("一");
        frame.setLayout(new GridLayout(3,5,3,3));
        JButton but = null;
        for(int i=0;i<15;i++){
            but = new JButton("按钮");
            frame.add(but);
        }
        frame.pack();
        frame.setVisible(true);
    }
}