Java_Day12(中)

习题1描述

代码

import java.awt.*;

public class CenterPanel {

	public static void main(String[] args) {
		MyFrame mf = new MyFrame("FrameWithPanel", 100, 100, 400, 300);
	}
}

class MyFrame extends Frame {
	private Panel p;
	MyFrame(String name, int x, int y, int width, int height) {
		super(name);
		setLayout(null);		
		setBounds(x, y, width, height);
		setVisible(true);
		p = new Panel(null);
		p.setBounds(width/4, height/4, width/2, height/2);
		p.setBackground(Color.YELLOW);
		setBackground(Color.BLUE);
		add(p);
	}
}

习题2描述

使用 Container 的嵌套实现以下布局：

代码：

import java.awt.*;

public class TenButtons {

	public static void main(String[] args) {
		Frame f = new Frame("Java Frame");
		f.setBounds(100, 100, 400, 300);
		f.setBackground(null);
		f.setLayout(new GridLayout(2,1));  //将整体设为两行一列
		Panel p1 = new Panel(new BorderLayout());
		Panel p2 = new Panel(new BorderLayout());
		Panel p11 = new Panel(new GridLayout(2,1));  //添加一个两行一列的panel
		Panel p21 = new Panel(new GridLayout(2,2));  //添加一个两行两列的panel
		p1.add(new Button("BUTTON"), BorderLayout.WEST);
		p1.add(new Button("BUTTON"), BorderLayout.EAST);
		p11.add(new Button("BUTTON"));
		p11.add(new Button("BUTTON"));
		p2.add(new Button("BUTTON"), BorderLayout.WEST);
		p2.add(new Button("BUTTON"), BorderLayout.EAST);
		for (int i = 0; i < 4; i++) {  //添加四个按钮
			p21.add(new Button("BUTTON"));
		}
		p1.add(p11);
		p2.add(p21);
		f.add(p1);
		f.add(p2);
		f.setVisible(true);
	}
}