// 12-7 布 局 管 理 器 。package GridBaglayout;import java.awt.*;import java.util.*;public class TestGridBaglayout {    Frame f;    protected void makebutton(String name,GridBagLayout gridbag,GridBagConstraints c){        Button button=new Button(name);        gridbag.setConstraints(button,c);        f.add(button);    }    public void create(){        f=new Frame("TestGridBaglayout");        GridBagLayout gridbag=new GridBagLayout();        GridBagConstraints c=new GridBagConstraints();        f.setLayout(gridbag);        c.fill=GridBagConstraints.BOTH;        //c.fill=c.BOTH;        c.weightx=1.0;        makebutton("1",gridbag,c);        makebutton("2",gridbag,c);        c.gridwidth=c.REMAINDER;        makebutton("3",gridbag,c);        c.insets=new Insets(-10,-10,-10,-10);        c.fill=GridBagConstraints.BOTH;        c.gridwidth=2;        c.weightx=0.0;        makebutton("4",gridbag,c);        c.insets=new Insets(0,0,0,0);        c.gridwidth=GridBagConstraints.RELATIVE;        makebutton("5",gridbag,c);        c.gridwidth=GridBagConstraints.REMAINDER;        makebutton("6",gridbag,c);        c.gridheight=1;        c.gridwidth=1;        c.weighty=1.0;        c.anchor=GridBagConstraints.EAST;        makebutton("7",gridbag,c);        c.weighty=0.0;        c.gridwidth=GridBagConstraints.REMAINDER;        c.gridheight=1;        makebutton("8",gridbag,c);        makebutton("9",gridbag,c);        f.setSize(500,300);        f.setVisible(true);    }    public static void main(String[] args) {      TestGridBaglayout test = new TestGridBaglayout();      test.create();    }}