JavaGUI(二)布局管理器

3、布局管理器

• 流式布局

  package com.study.lesson01;
  
  import java.awt.*;
  
  public class TestFlowLayout {
      public static void main(String[] args) {
          Frame frame = new Frame();
  
          //组件-按钮alt+回车
          Button button1 = new Button("button1");
          Button button2 = new Button("button2");
          Button button3 = new Button("button3");
  
          //设置为流式布局
          //frame.setLayout(new FlowLayout());//默认居中
          //frame.setLayout(new FlowLayout(FlowLayout.LEFT));
          frame.setLayout(new FlowLayout(FlowLayout.RIGHT));
  
  
          frame.setSize(200,200);
  
          //把按钮添加上去
          frame.add(button1);
          frame.add(button2);
          frame.add(button3);
  
          frame.setVisible(true);
  
      }
  }
  
  

• 东西南北中

  package com.study.lesson01;
  
  import java.awt.*;
  
  public class TestBorderLayout {
      public static void main(String[] args) {
          Frame frame = new Frame("TestBorderLayout");
  
          Button east = new Button("east");
          Button west = new Button("west");
          Button south = new Button("south");
          Button north = new Button("north");
          Button center = new Button("center");
  
          frame.add(east,BorderLayout.EAST);
          frame.add(west,BorderLayout.WEST);
          frame.add(south,BorderLayout.SOUTH);
          frame.add(north,BorderLayout.NORTH);
          frame.add(center,BorderLayout.CENTER);
  
          frame.setSize(200,200);
  
          frame.setVisible(true);
      }
  }
  
  

• 表格布局 Grid

  package com.study.lesson01;
  
  import java.awt.*;
  
  public class TestGridLayout {
      public static void main(String[] args) {
          Frame frame = new Frame("TestGridLayout");
  
          Button btn1 = new Button("btn1");
          Button btn2 = new Button("btn2");
          Button btn3 = new Button("btn3");
          Button btn4 = new Button("btn4");
          Button btn5 = new Button("btn5");
          Button btn6 = new Button("btn6");
  
          frame.setLayout(new GridLayout(3,2));
  
          frame.add(btn1);
          frame.add(btn2);
          frame.add(btn3);
          frame.add(btn4);
          frame.add(btn5);
          frame.add(btn6);
  
          frame.pack();//Java函数
          frame.setVisible(true);
  
      }
  }
  
  

练习:

分析：

代码实现：

package com.study.lesson01;

import java.awt.*;

//联系的demo讲解
public class TestDemo {
    public static void main(String[] args) {
        //总Frame
        Frame frame = new Frame();

        frame.setSize(400,300);
        frame.setLocation(300,400);
        frame.setBackground(Color.black);
        frame.setVisible(true);
        frame.setLayout(new GridLayout(2,1));

        //四个面板
        Panel p1 = new Panel(new BorderLayout());
        Panel p2 = new Panel(new GridLayout(2,1));
        Panel p3 = new Panel(new BorderLayout());
        Panel p4 = new Panel(new GridLayout(2,2));

        //上面搞定
        p1.add(new Button("East-1"),BorderLayout.EAST);
        p1.add(new Button("West-1"),BorderLayout.WEST);
        p2.add(new Button("p2-btn-1"));
        p2.add(new Button("p2-btn-2"));
        p1.add(p2,BorderLayout.CENTER);

        //下面搞定
        p3.add(new Button("East-2"),BorderLayout.EAST);
        p3.add(new Button("West-2"),BorderLayout.WEST);
        //中间的四个
        for (int i = 0; i < 4; i++) {
            p4.add(new Button("for-"+i));
        }
        p3.add(p4,BorderLayout.CENTER);

        frame.add(p1);
        frame.add(p3);

    }
}

总结：

1. Frame是一个顶级窗口

2. Panel午饭单独显示，必须添加到某个容器中

3. 布局管理器

   1. 流式
   2. 东西南北中
   3. 表格

4. 大小，定位，背景颜色，可见性，监听！