【JAVAGUI】AWT—3种布局管理器

• 流式布局：就是从左到右排列

  package GUI;
  
  import java.awt.*;
  import java.awt.event.WindowAdapter;
  import java.awt.event.WindowEvent;
  
  public class TestFlowLayout {
      public static void main(String[] args) {
          Frame frame = new Frame();
  
          //组件--按钮
          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());//默认为居中
          //frame.setLayout(new FlowLayout(FlowLayout.LEFT));//左边
          frame.setLayout(new FlowLayout(FlowLayout.RIGHT));//右边
  
          frame.setSize(200,200);
  
          //把按钮添加上去
          frame.add(button1);
          frame.add(button2);
          frame.add(button3);
  
          frame.setVisible(true);
  
          //设置窗口关闭监听事件
          frame.addWindowListener(new WindowAdapter() {
              @Override
              public void windowClosing(WindowEvent e) {
                  System.exit(0);
              }
          });
  
      }
  }
  

• 东西南北中

  package GUI;
  
  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

  package GUI;
  
  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));
          //它会自动填充
          frame.add(btn1);
          frame.add(btn2);
          frame.add(btn3);
          frame.add(btn4);
          frame.add(btn5);
          frame.add(btn6);
  
          frame.pack();//Java函数，自动选择最优
          frame.setSize(200,200);
          frame.setVisible(true);
      }
  }
  

• 练习：做出下面的窗口样式：

代码如下：

package GUI;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class lianxi1 {
    public static void main(String[] args) {
        Frame frame = new Frame("练习嵌套组件");

        frame.setVisible(true);
        //设置窗口及组件的大小
        frame.setSize(400,400);
        frame.setLocation(200,100);
        frame.setBackground(Color.blue);

        //布局为表格布局，两行一列
        frame.setLayout(new GridLayout(2,1));
        //创建上下两个面板来装
        Panel panel1 = new Panel(new BorderLayout());
        Panel panel2 = new Panel(new BorderLayout());

        //对于上边的Panel1
        //首先创建4个button
        Button button1 = new Button("Button1");
        Button button2 = new Button("Button2");
        Button button3 = new Button("Button3");
        Button button4 = new Button("Button4");
        //流式布局，左，中，右
        panel1.add(button1,BorderLayout.WEST);
        panel1.add(button4,BorderLayout.EAST);
        //中间的用Panel4面板填充 里面用表格布局，两行一列
        Panel panel4 = new Panel(new GridLayout(2,1));
        panel1.add(panel4,BorderLayout.CENTER);
        panel4.add(button2);
        panel4.add(button3);

        //对于下边的Panel2,中间那部分再放一个面板来放表格布局
        //中间用面板填充，表格布局，两行两列
        Panel panel3 = new Panel(new GridLayout(2,2));

        Button button5 = new Button("button5");
        Button button6 = new Button("button6");
        Button button7 = new Button("button7");
        Button button8 = new Button("button8");
        Button button9 = new Button("button9");
        Button button10 = new Button("button10");
        //流式布局，左，中，右
        panel2.add(button5,BorderLayout.WEST);
        panel2.add(button10,BorderLayout.EAST);
        panel2.add(panel3,BorderLayout.CENTER);
        panel3.add(button6);
        panel3.add(button7);
        panel3.add(button8);
        panel3.add(button9);

        frame.add(panel1);
        frame.add(panel2);
        //窗口关闭监听事件
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });


    }
}

• 做出来的样子：

2.2.3.1 总结：

• Frame是一个顶级窗口

• Panel无法单独显示，必须添加到某个容器中

• 布局管理器：

  • **流式

  • 东西南北中

  • 表格**

• 大小，定位，背景颜色，可见性，监听