7.布局：GridBagLayout（网格包布局）

非规则的矩阵

public static void main(String[] args) {
      Frame f = new Frame("GridBagLayout");
      f.setVisible(true);
      GridBagLayout layout=new GridBagLayout();
      f.setLayout(layout);
      GridBagConstraints c=new GridBagConstraints();
      //设置横向坐标可以拉伸
      c.fill=GridBagConstraints.BOTH;
      //设置横向，纵向权值为1
      c.weightx=1;
      c.weighty=0;
      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");
      layout.setConstraints(btn1,c);
      layout.setConstraints(btn2,c);
      layout.setConstraints(btn3,c);
      layout.setConstraints(btn4,c);
      //本行最后一个组件
      c.gridwidth=GridBagConstraints.REMAINDER;
      layout.setConstraints(btn5,c);
      f.add(btn1);
      f.add(btn2);
      f.add(btn3);
      f.add(btn4);
      f.add(btn5);
      //设置横向，纵向权值为0
      c.weightx=0;
      c.weighty=0;
      Button btn6 = new Button("btn6");
      layout.setConstraints(btn6,c);
      f.add(btn6);
      //设置组件横向占2个网格
      c.gridwidth=2;
      Button btn7 = new Button("btn7");
      layout.setConstraints(btn7,c);
      f.add(btn7);
      //本行最后一个组件
      c.gridwidth=GridBagConstraints.REMAINDER;
      Button btn8 = new Button("btn8");
      layout.setConstraints(btn8,c);
      f.add(btn8);
     //设置组件纵向跨两个网格，横向跨一个网格
      c.gridheight=2;
      c.gridwidth=1;
      //设置横向，纵向权重为2
      c.weightx=2;
      c.weighty=2;
      Button btn9 = new Button("btn9");
      layout.setConstraints(btn9,c);
      f.add(btn9);
      c.gridwidth=GridBagConstraints.REMAINDER;
      c.gridheight=1;
      Button btn10 = new Button("btn10");
      Button btn11 = new Button("btn11");
      layout.setConstraints(btn10,c);
      layout.setConstraints(btn11,c);
      f.add(btn10);
      f.add(btn11);
      //设置frame最佳大小并可见
      f.pack();
  }