JAVA 图形用户界面的编程-控件与布局

附：实验源程序代码

import java.awt.BorderLayout;

import java.awt.Font;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

class Frame1 extends JFrame //设计一个窗体类

{

JButton jb1, jb2, jb3; //按钮

JLabel jl; //标签

Frame1() //构造方法

{

jb1 =new JButton("红色"); //创建按钮对象

jb2 = new JButton("绿色") ;

jb3 = new JButton("蓝色") ;

jl = new JLabel("设定标签颜色") ; //创建标签对象

jl.setFont(new Font("隶书", Font.PLAIN, 32)); //标签字体

JPanel jp1 = new JPanel(); //面板1

JPanel jp2 = new JPanel(); //面板2

jp1 .add(jl); //标签放入面板1

jp2 .add(jb1); //三个按键放入面板2

jp2 .add(jb2);

jp2 .add(jb3);

setLayout( new BorderLayout() ); //窗体设定为边界布局

add(jp1, BorderLayout.NORTH ) ; //标签面板放在窗体上端

add(jp2, BorderLayout.CENTER ); //按钮面板放在窗体中间

setSize(250,150) ; //设定窗体大小和位置

setTitle("实验6-1") ; //设定窗体标题

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setVisible(true) ; //设定窗体可见

}

}

class Experiment9_1

{

public static void main(String[] args)

{

new Frame1();

}

}

import javax.swing.*;

import java.awt.*;

class Framel extends JFrame

{

JButton submit;

JLabel lb_id,lb_name,lb_sex,lb_ty,lb_bj,lb_desc;

JTextField jtf_id,jtf_name;

JRadioButton male,female;

JCheckBox ck_ty;

JComboBox cb_bj;

JTextArea txta_desc;

Framel()

{

lb_id = new JLabel("学号:",JLabel.RIGHT);

lb_name = new JLabel("姓名:",JLabel.RIGHT);

lb_sex = new JLabel("性别：",JLabel.RIGHT);

lb_ty = new JLabel("团员",JLabel.RIGHT);

lb_bj = new JLabel("班级",JLabel.RIGHT);

lb_desc = new JLabel("简介",JLabel.RIGHT);

jtf_id = new JTextField(12);

jtf_name = new JTextField(12);

male = new JRadioButton("男");

female = new JRadioButton("女");

ck_ty = new JCheckBox();

txta_desc = new JTextArea(5,11);

male.setSelected(true);

ButtonGroup bg_sex = new ButtonGroup();

bg_sex.add(male);

bg_sex.add(female);

String items[] = {"网络信息1011","软件1011","系统维护1011"};

cb_bj = new JComboBox(items);

JPanel jtf = new JPanel();

JPanel jtf2 = new JPanel();

JPanel jtf3 = new JPanel();

JPanel jtf4 = new JPanel();

JPanel jtf5 = new JPanel();

jtf.add(lb_id);

jtf.add(jtf_id);

jtf2.add(lb_name);

jtf2.add(jtf_name);

jtf3.add(lb_sex);

jtf3.add(male);

jtf3.add(female);

jtf3.add(lb_ty);

jtf3.add(ck_ty);

jtf4.add(lb_bj);

jtf4.add(cb_bj);

jtf5.add(lb_desc);

jtf5.add(txta_desc);

setLayout(new BoxLayout(this.getContentPane(), BoxLayout.Y_AXIS));

add(jtf);

add(jtf2);

add(jtf3);

add(jtf4);

add(jtf5);

JPanel jp_submit = new JPanel();

submit = new JButton("确定");

jp_submit.add(submit);

add(jp_submit);

}

}

public class Experiment9_2

{

public static void main(String[] args)

{

Framel f = new Framel();

f.setLocation(200,100);

f.setVisible(true);

f.setTitle("实验6_2");

f.setSize(250,300);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

实验三：

import java.awt.GridLayout;

import javax.swing.BoxLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

class Frame3 extends JFrame

{

Frame3()

{

setLayout(new BoxLayout(this.getContentPane(),BoxLayout.Y_AXIS));

JPanel jp1=new JPanel();

JPanel jp2=new JPanel();

JButton jb[]=new JButton[16];

jp1.add(new JTextField(20));

add(jp1);

jp2.setLayout(new GridLayout(4,4,5,5));

for(int i=0;i<10;i++)

jb[i]=new JButton(""+i);

jb[10] = new JButton(".");

jb[11] = new JButton("1/x");

jb[12] = new JButton("C");

jb[13] = new JButton("√");

jb[14] = new JButton("㎡");

jb[15] = new JButton("㏒");

for(int i=1;i<4;i++)

jp2.add(jb[i]);

jp2.add(jb[12]);

for(int i=4;i<7;i++)

jp2.add(jb[i]);

jp2.add(jb[13]);

for(int i=7;i<10;i++)

jp2.add(jb[i]);

jp2.add(jb[14]);

jp2.add(jb[0]);

jp2.add(jb[10]);

jp2.add(jb[11]);

jp2.add(jb[15]);

add(jp2);

setVisible(true);

pack();

setTitle("实验6-3");

setLocation(300,400);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args)

{

new Frame3();

}

}