如下代码示例GridBagLayout,却总不能正常显示,求指教!!!!
import java.awt.*;
import java.awt.event.*;public class GridBagLayoutDemo extends Frame{
Label l1,l2,l3,l4;
TextField tf1,tf2,tf3;
Button btn1,btn2;
CheckboxGroup cbg;
Checkbox cb1,cb2,cb3,cb4;
GridBagLayout gb;
GridBagConstraints gbc;
public GridBagLayoutDemo(String title) {
super(title);
l1=new Label("Name:");
l2=new Label("Password:");
l3=new Label("Repeate:");
l4=new Label("tujing:");
tf1=new TextField(20);
tf2=new TextField(20);
tf3=new TextField(20);
gb=new GridBagLayout();
setLayout(gb);
gbc=new GridBagConstraints();
Panel p=new Panel();
cbg=new CheckboxGroup();
cb1=new Checkbox("Search",cbg,false);
cb2=new Checkbox("Advertise",cbg,false);
cb3=new Checkbox("Friends",cbg,false);
cb4=new Checkbox("Others",cbg,false);
p.add(cb1);
p.add(cb2);
p.add(cb3);
p.add(cb4);
btn1=new Button("Submit");
btn2=new Button("Reset");
Panel p1=new Panel();
p1.add(btn1);
p1.add(btn2);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
gbc.fill=GridBagConstraints.HORIZONTAL;
addComponent(l1,0,0,1,1);
addComponent(tf1,0,2,1,4);
addComponent(l2,1,0,1,1);
addComponent(tf2,1,2,1,4);
addComponent(l3,2,0,1,1);
addComponent(tf3,2,2,1,4);
addComponent(l4,3,0,1,1);
addComponent(p,3,2,1,1);
addComponent(p1,4,2,1,5);
}
public void addComponent(Component c,int row,int col,int nrow,int ncol) {
gbc.gridx=col;
gbc.gridy=row;
gbc.gridheight=ncol;
gbc.gridwidth=nrow;
gb.setConstraints(c, gbc);
add(c);
}
public static void main(String[] args) {
GridBagLayoutDemo mygb=new GridBagLayoutDemo("GridBagLayout");
mygb.setSize(500,400);
mygb.setVisible(true); }
}
import java.awt.*;
import java.awt.event.*;public class GridBagLayoutDemo extends Frame{
Label l1,l2,l3,l4;
TextField tf1,tf2,tf3;
Button btn1,btn2;
CheckboxGroup cbg;
Checkbox cb1,cb2,cb3,cb4;
GridBagLayout gb;
GridBagConstraints gbc;
public GridBagLayoutDemo(String title) {
super(title);
l1=new Label("Name:");
l2=new Label("Password:");
l3=new Label("Repeate:");
l4=new Label("tujing:");
tf1=new TextField(20);
tf2=new TextField(20);
tf3=new TextField(20);
gb=new GridBagLayout();
setLayout(gb);
gbc=new GridBagConstraints();
Panel p=new Panel();
cbg=new CheckboxGroup();
cb1=new Checkbox("Search",cbg,false);
cb2=new Checkbox("Advertise",cbg,false);
cb3=new Checkbox("Friends",cbg,false);
cb4=new Checkbox("Others",cbg,false);
p.add(cb1);
p.add(cb2);
p.add(cb3);
p.add(cb4);
btn1=new Button("Submit");
btn2=new Button("Reset");
Panel p1=new Panel();
p1.add(btn1);
p1.add(btn2);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
gbc.fill=GridBagConstraints.HORIZONTAL;
addComponent(l1,0,0,1,1);
addComponent(tf1,0,2,1,4);
addComponent(l2,1,0,1,1);
addComponent(tf2,1,2,1,4);
addComponent(l3,2,0,1,1);
addComponent(tf3,2,2,1,4);
addComponent(l4,3,0,1,1);
addComponent(p,3,2,1,1);
addComponent(p1,4,2,1,5);
}
public void addComponent(Component c,int row,int col,int nrow,int ncol) {
gbc.gridx=col;
gbc.gridy=row;
gbc.gridheight=ncol;
gbc.gridwidth=nrow;
gb.setConstraints(c, gbc);
add(c);
}
public static void main(String[] args) {
GridBagLayoutDemo mygb=new GridBagLayoutDemo("GridBagLayout");
mygb.setSize(500,400);
mygb.setVisible(true); }
}
addComponent(l1, 0, 0, 1, 1);
addComponent(tf1, 0, 2, 1, 1);
addComponent(l2, 1, 0, 1, 1);
addComponent(tf2, 1, 2, 1, 1);
addComponent(l3, 2, 0, 1, 1);
addComponent(tf3, 2, 2, 1, 1);
addComponent(l4, 3, 0, 1, 1);
addComponent(p, 3, 2, 1, 1);
addComponent(p1, 4, 2, 1, 5);
import java.awt.Checkbox;
import java.awt.CheckboxGroup;
import java.awt.Component;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;public class GridBagLayoutDemo extends Frame{
Label l1,l2,l3,l4;
TextField tf1,tf2,tf3;
Button btn1,btn2;
CheckboxGroup cbg;
Checkbox cb1,cb2,cb3,cb4;
GridBagLayout gb;
GridBagConstraints gbc;
public GridBagLayoutDemo(String title) {
super(title);
l1=new Label("Name:");
l2=new Label("Password:");
l3=new Label("Repeate:");
l4=new Label("tujing:");
tf1=new TextField(20);
tf2=new TextField(20);
tf3=new TextField(20);
gb=new GridBagLayout();
setLayout(gb);
gbc=new GridBagConstraints();
Panel p=new Panel();
cbg=new CheckboxGroup();
cb1=new Checkbox("Search",cbg,false);
cb2=new Checkbox("Advertise",cbg,false);
cb3=new Checkbox("Friends",cbg,false);
cb4=new Checkbox("Others",cbg,false);
p.add(cb1);
p.add(cb2);
p.add(cb3);
p.add(cb4);
btn1=new Button("Submit");
btn2=new Button("Reset");
Panel p1=new Panel();
p1.add(btn1);
p1.add(btn2);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
gbc.fill=GridBagConstraints.HORIZONTAL;
addComponent(l1,0,0,1,1);
addComponent(tf1,0,2,1,4);
addComponent(l2,1,0,1,1);
addComponent(tf2,1,2,1,4);
addComponent(l3,2,0,1,1);
addComponent(tf3,2,2,1,4);
addComponent(l4,3,0,1,1);
addComponent(p,3,2,1,1);
addComponent(p1,4,2,1,5);
}
public void addComponent(Component c,int row,int col,int nrow,int ncol) {
gbc.gridx=col;
gbc.gridy=row;
// gridheight、gridwidth颠倒了
// gbc.gridheight=ncol;
// gbc.gridwidth=nrow;
gbc.gridheight=nrow;
gbc.gridwidth=ncol;
gb.setConstraints(c, gbc);
add(c);
}
public static void main(String[] args) {
GridBagLayoutDemo mygb=new GridBagLayoutDemo("GridBagLayout");
mygb.setSize(500,400);
mygb.setVisible(true); }
}