GUI基础知识
GUI编程
1，简介
- 图形用户界面,Graphical User Interface,又称图形用户接口，是指采用图形方式显示的计算机操作用户界面。
- GUI的核心技术：AWT,Swing
2，Awt
2.1 AWT简介
- AWT:Abstract Window Toolkit,抽象窗口工具包，该包提供了一套与本地图形界面进行交互的接口，是Java提供的用来建立和设置Java的GUI的基本工具
- 包含了很多类和接口
- 元素：窗口，按钮，文本框
- java.awt
2.2 组件与容器
1, Frame
package com.ym.lesson01;
import java.awt.*;
public class FrameTest {
public static void main(String[] args) {
//Frame类 看源码
Frame frame = new Frame("我的第一个图形用户界面窗口");
//设置可见性
frame.setVisible(true);
//设置窗口大小
frame.setSize(400,400);
//设置背景颜色
frame.setBackground(Color.blue);
//设置弹出的初始位置
frame.setLocation(200,200);
//设置窗口大小固定
frame.setResizable(false);
}
}
生成多个Frame
package com.ym.lesson01;
import java.awt.*;
public class FrameTest2 {
public static void main(String[] args) {
MyFrame myFrame1 = new MyFrame(100, 100, 200, 200, Color.green);
MyFrame myFrame2 = new MyFrame(300, 100, 200, 200, Color.green);
MyFrame myFrame3 = new MyFrame(100, 300, 200, 200, Color.green);
MyFrame myFrame4 = new MyFrame(300, 300, 400, 400, Color.green);
}
}
//封装
class MyFrame extends Frame{
static int id=0;
public MyFrame(int x,int y,int w,int h,Color color){
super("MyFrame"+(++id));
//setLocation(200,200);
//setSize(400,400);
setBounds(x,y,w,h);
setBackground(color);
setVisible(true);
setResizable(false);
}
}
2,Panel
解决了窗口关闭问题
package com.ym.lesson01;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
public class PanelTest {
public static void main(String[] args) {
Frame frame = new Frame("frame");
Panel panel = new Panel();
//设置布局
frame.setLayout(null);
//frame坐标,背景颜色
frame.setBounds(100,100,200,200);
frame.setBackground(new Color(35, 128, 90));
//panel坐标,背景颜色
panel.setBounds(50,50,50,50);
panel.setBackground(new Color(55, 91, 128));
//frame.add(panel)
frame.add(panel);
frame.setVisible(true);
frame.setResizable(false);
//监听事件，监听窗口关闭事件 system.exit(0)
//适配器模式
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
// super.windowClosing(e);
//结束进程
System.exit(0);
}
});
}
}
2.3,布局管理器
2.3.1 流式布局,FlowLayout
package com.ym.lesson01;
import java.awt.*;
public class FlowLayoutTest {
public static void main(String[] args) {
Frame frame = new Frame();
Button button1 = new Button("1");
Button button2 = new Button("2");
Button button3 = new Button("3");
frame.setBounds(100,100,200,200);
frame.setVisible(true);
frame.add(button1);
frame.add(button2);
frame.add(button3);
//FlowLayout
// frame.setLayout(new FlowLayout());//默认center
// frame.setLayout(new FlowLayout(FlowLayout.LEFT));//左
frame.setLayout(new FlowLayout(FlowLayout.RIGHT));//右
}
}
3.2 东南西北中,BorderLayout
package com.ym.lesson01;
import java.awt.*;
public class BorderLayoutTest {
public static void main(String[] args) {
Frame frame = new Frame();
Button east = new Button("East");//东
Button west = new Button("West");//西
Button south = new Button("South");//南
Button north = new Button("North");//北
Button center = new Button("Center");//中
//东西南北中布局
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.setBounds(100,100,100,100);
frame.setVisible(true);
}
}
2.3.3 表格布局,GridLayout
package com.ym.lesson01;
import java.awt.*;
public class GridLayoutTest {
public static void main(String[] args) {
Frame frame = new Frame();
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.add(btn1);
frame.add(btn2);
frame.add(btn3);
frame.add(btn4);
frame.add(btn5);
frame.add(btn6);
frame.setLayout(new GridLayout(3,2));
frame.setVisible(true);
// frame.setSize(200,200);
frame.pack();//java中的一个函数，确定frame的最佳大小
}
}
2.3.4 练习
package com.ym.lesson01;
import javax.swing.border.Border;
import java.awt.*;
public class Test {
public static void main(String[] args) {
Frame frame = new Frame();
frame.setVisible(true);
frame.setBounds(100,100,400,300);
frame.setLayout(new GridLayout(2,1));
Panel p1 = new Panel(new BorderLayout());
Panel p2 = new Panel(new GridLayout(2,1));
Panel p3 = new Panel(new BorderLayout());
// Panel p4 = new Panel(new GridLayout(2,2));
Panel p4 = new Panel();
p4.setLayout(new GridLayout(2,2));
p1.add(new Button("p1_btn_west"),BorderLayout.WEST);
p1.add(new Button("p1_btn_east"),BorderLayout.EAST);
p2.add(new Button("p2_btn_top"));
p2.add(new Button("p2_btn_bottom"));
p1.add(p2,BorderLayout.CENTER);
//下面
p3.add(new Button("p3_btn_west"),BorderLayout.WEST);
p3.add(new Button("p3_btn_east"),BorderLayout.EAST);
p4.add(new Button("p4_btn_top1"));
p4.add(new Button("p4_btn_top2"));
p4.add(new Button("p4_btn_bottom1"));
p4.add(new Button("p4_btn_bottom2"));
p3.add(p4,BorderLayout.CENTER);
frame.add(p1);
frame.add(p3);
}
}
2.4, 事件监听
package com.ym.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class ActionEventTest {
public static void main(String[] args) {
Frame frame = new Frame();
Button button = new Button();
//因为addActionListener()需要一个ActionListener，
//所以构造了一个MyActionListener类
MyActionListener myActionListener = new MyActionListener();
button.addActionListener(myActionListener);
frame.add(button,BorderLayout.CENTER);
frame.setVisible(true);
frame.pack();
windowClose(frame);
}
//关闭窗口方法
private static void windowClose(Frame frame){
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
}
class MyActionListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("111");
}
}
2.4.1 多个按钮共享一个事件
package com.ym.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class ActionEventTest2{
public static void main(String[] args) {
Frame frame = new Frame();
Button btn1 = new Button("start");
Button btn2 = new Button("stop");
btn1.setActionCommand("btn1_start");//设置标签值
MyListener myListener = new MyListener();
btn1.addActionListener(myListener);
btn2.addActionListener(myListener);
frame.add(btn1,BorderLayout.NORTH);
frame.add(btn2,BorderLayout.SOUTH);
frame.setVisible(true);
frame.pack();
}
static class MyListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());//getActionCommand()得到按钮上的label
if(e.getActionCommand().equals("btn1_start")){
System.out.println("点击了开始btn1_start");
}else{
System.out.println("点击了结束stop");
}
}
}
}
2.5，输入框TextField
package com.ym.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class TextFieldTest {
public static void main(String[] args) {
MyFrame myFrame = new MyFrame();
}
}
class MyFrame extends Frame{
public MyFrame(){
TextField textField = new TextField();
add(textField);
MyTextListener myTextListener = new MyTextListener();
//按下回车键就会触发事件
textField.addActionListener(myTextListener);
//输入框中的文本替换为*，但控制台显示的是文本，不是*
textField.setEchoChar('*');
pack();
setVisible(true);
}
}
class MyTextListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getSource());//e.getSource()得到资源，返回object
TextField textField = (TextField) e.getSource();
System.out.println(textField.getText());//获得输入框中的文本
textField.setText("");//按下回车就会清空输入框中的内容
}
}
2.6,简易计算器
package com.ym.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//简易计算器
public class CalcTest {
public static void main(String[] args) {
Calculator calculator = new Calculator();
}
}
//计算器类
class Calculator extends Frame {
public Calculator(){
//三个文本框
TextField num1 = new TextField(10);
TextField num2 = new TextField(10);
TextField num3 = new TextField(20);
//一个按钮
Button button = new Button("=");
button.addActionListener(new MyCalculatorListener(num1,num2,num3));
//一个标签
Label label = new Label("+");
//流式布局，FlowLayout
setLayout(new FlowLayout());
add(num1);
add(label);
add(num2);
add(button);
add(num3);
pack();
setVisible(true);
}
}
//监听器类
class MyCalculatorListener implements ActionListener{
//获取三个变量
private TextField num1,num2,num3;
public MyCalculatorListener(TextField num1,TextField num2,TextField num3){
this.num1=num1;
this.num2=num2;
this.num3=num3;
}
@Override
public void actionPerformed(ActionEvent e) {
//1，获得加数和被加数
int n1 = Integer.parseInt(num1.getText());
int n2 = Integer.parseInt(num2.getText());
//2，加法运算后将得数放到第三个框中
num3.setText(""+(n1+n2));
//3，清除前两个框中的内容
num1.setText("");
num2.setText("");
}
}
改造为面向对象写法（组合）
package com.ym.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//简易计算器
public class CalcTest {
public static void main(String[] args) {
Calculator calculator = new Calculator();
calculator.loadFrame();
}
}
//计算器类
class Calculator extends Frame {
//属性
TextField num1;
TextField num2;
TextField num3;
//方法
public void loadFrame(){
//三个文本框
num1 = new TextField(10);
num2 = new TextField(10);
num3 = new TextField(10);
//一个按钮
Button button = new Button("=");
//为按钮添加监听事件
button.addActionListener(new MyCalculatorListener(this));
//一个标签
Label label = new Label("+");
//流式布局，FlowLayout
setLayout(new FlowLayout());
add(num1);
add(label);
add(num2);
add(button);
add(num3);
pack();
setVisible(true);
}
}
//监听器类
class MyCalculatorListener implements ActionListener{
//获取计算器这个对象，在一个类中组合另外一个类
Calculator calculator=null;
public MyCalculatorListener(Calculator calculator){
this.calculator=calculator;
}
@Override
public void actionPerformed(ActionEvent e) {
//1，获得加数和被加数
int n1 = Integer.parseInt(calculator.num1.getText());
int n2 = Integer.parseInt(calculator.num2.getText());
//2，加法运算后将得数放到第三个框中
calculator.num3.setText(""+(n1+n2));
//3，清除前两个框中的内容
calculator.num1.setText("");
calculator.num2.setText("");
}
}
内部类
package com.ym.lesson02;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//简易计算器
public class CalcTest {
public static void main(String[] args) {
Calculator calculator = new Calculator();
calculator.loadFrame();
}
}
//计算器类
class Calculator extends Frame {
//属性
TextField num1;
TextField num2;
TextField num3;
//方法
public void loadFrame(){
//三个文本框
num1 = new TextField(10);
num2 = new TextField(10);
num3 = new TextField(20);
//一个按钮
Button button = new Button("=");
//为按钮添加监听事件
button.addActionListener(new MyCalculatorListener());
//一个标签
Label label = new Label("+");
//流式布局，FlowLayout
setLayout(new FlowLayout());
add(num1);
add(label);
add(num2);
add(button);
add(num3);
pack();
setVisible(true);
}
//监听器类
private class MyCalculatorListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e) {
//内部类：可以畅通无阻地访问外部的属性和方法
//1，获得加数和被加数
int n1 = Integer.parseInt(num1.getText());
int n2 = Integer.parseInt(num2.getText());
//2，加法运算后将得数放到第三个框中
num3.setText(""+(n1+n2));
//3，清除前两个框中的内容
num1.setText("");
num2.setText("");
}
}
}
2.7画笔paint
package com.ym.lesson03;
import java.awt.*;
public class PaintTest {
public static void main(String[] args) {
new MyPaint().loadFrame();
}
}
class MyPaint extends Frame{
public void loadFrame(){
setVisible(true);
setBounds(100,100,400,400);
}
//画笔
@Override
public void paint(Graphics g) {
// super.paint(g);
//画笔颜色
// g.setColor(Color.green);
//画圆
g.drawOval(100,100,100,100);
g.fillOval(100,100,100,100);//实心圆
// g.setColor(Color.red);
g.fillRect(200,200,100,100);//实心圆
//画笔用完之后要还原到画笔默认的颜色
}
}
2.8鼠标监听
2.9窗口监听
package com.ym.lesson03;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class WindowListenerTest {
public static void main(String[] args) {
new WindowFrame();
}
}
class WindowFrame extends Frame {
public WindowFrame() {
setBackground(Color.blue);
setVisible(true);
setBounds(100,100,200,200);
// addWindowListener(new WindowListener());
this.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.out.println("windowClosing");
}
@Override
public void windowActivated(WindowEvent e) {
WindowFrame wf=(WindowFrame) e.getSource();
wf.setTitle("windowActivated");
System.out.println("windowActivated");
}
@Override
public void windowDeactivated(WindowEvent e) {
System.out.println("windowDeactivated");
}
});
}
class WindowListener extends WindowAdapter{
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);//程序退出
}
}
}
2.10键盘监听
package com.ym.lesson03;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class KeyListenerTest {
public static void main(String[] args) {
new KeyFrame();
}
}
class KeyFrame extends Frame{
public KeyFrame(){
setBounds(100,100,200,200);
setVisible(true);
this.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if(keyCode==KeyEvent.VK_UP){
System.out.println("你按下了上键");
}
}
});
}
}
3, Swing
3.1窗口，面板
package com.ym.lesson04;
import javax.swing.*;
import java.awt.*;
public class JFrameTest {
public static void main(String[] args) {
new JFrameTest().init();
}
//init()初始化
public void init(){
JFrame jFrame = new JFrame();
jFrame.setVisible(true);
jFrame.setBounds(10,10,200,200);
jFrame.setBackground(Color.blue);
//获得一个容器
Container contentPane = jFrame.getContentPane();
contentPane.setBackground(Color.red);
JLabel jLabel = new JLabel("哈哈哈");
//设置水平对齐
jLabel.setHorizontalAlignment(SwingConstants.CENTER);
jFrame.add(jLabel);
}
}
3.2 弹窗JDialog
package com.ym.lesson04;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class DialogTest extends JFrame {
public DialogTest() {
this.setVisible(true);
this.setSize(400,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
Container container = this.getContentPane();
container.setLayout(null);//绝对布局
JButton jButton = new JButton("点击弹出对话框");
jButton.setBounds(30,30,100,100);
jButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
MyDialog myDialog = new MyDialog();
}
});
container.add(jButton);
}
public static void main(String[] args) {
DialogTest dialogTest = new DialogTest();
}
}
class MyDialog extends JDialog{
public MyDialog() {
this.setVisible(true);
this.setBounds(100,100,100,100);
// this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);//默认有关闭事件
Container container = this.getContentPane();
container.setLayout(null);
container.add(new JLabel("abc"));
}
}
3.3 标签
图标和图片图标
package com.ym.lesson04;
import javax.swing.*;
import java.awt.*;
public class IconDemo extends JFrame implements Icon {
private int width;
private int height;
public IconDemo(){}
public IconDemo(int width,int height){
this.width=width;
this.height=height;
}
public void init(){
IconDemo iconDemo = new IconDemo(20, 20);
//把图标放在标签上
JLabel jLabel = new JLabel("iconDemo",iconDemo,SwingConstants.CENTER);
Container container = getContentPane();
container.add(jLabel);
this.setVisible(true);
this.setBounds(10,10,150,150);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new IconDemo().init();
}
@Override
public void paintIcon(Component c, Graphics g, int x, int y) {
g.fillOval(x,y,width,height);
}
@Override
public int getIconWidth() {
return width;
}
@Override
public int getIconHeight() {
return height;
}
}
package com.ym.lesson04;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class ImageIconDemo extends JFrame {
public ImageIconDemo(){
JLabel jLabel = new JLabel("ImageIcon");
//获取图片地址
URL url = ImageIconDemo.class.getResource("imageicondemo.png");
ImageIcon imageIcon = new ImageIcon(url);//注意命名冲突问题
jLabel.setIcon(imageIcon);
jLabel.setHorizontalAlignment(SwingConstants.CENTER);
Container container = getContentPane();
container.add(jLabel);
this.setVisible(true);
this.setBounds(10,10,100,100);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new ImageIconDemo();
}
}
3.4 面板
JPanel
package com.ym.lesson05;
import javax.swing.*;
import java.awt.*;
public class JPanelDemo extends JFrame {
public JPanelDemo(){
Container container = getContentPane();
container.setLayout(new GridLayout(1,2,5,5));
JPanel jPanel = new JPanel(new GridLayout(2,1));
JPanel jPane2 = new JPanel(new GridLayout(1,2));
jPanel.add(new JButton("1"));
jPanel.add(new JButton("1"));
jPane2.add(new JButton("2"));
jPane2.add(new JButton("2"));
container.add(jPanel);
container.add(jPane2);
setVisible(true);
setBounds(10,10,100,100);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JPanelDemo();
}
}
JScrollPane
package com.ym.lesson05;
import javax.swing.*;
import java.awt.*;
public class JScrollDemo extends JFrame {
public JScrollDemo(){
//文本域
JTextArea jTextArea = new JTextArea(10,10);
jTextArea.setText("你好呀");
//scroll面板
JScrollPane jScrollPane = new JScrollPane(jTextArea);
Container container = getContentPane();
container.add(jScrollPane);
this.setVisible(true);
this.setBounds(10,10,200,200);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JScrollDemo();
}
}
3.5 按钮
Jbutton
package com.ym.lesson05;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo01 extends JFrame {
public JButtonDemo01() {
//将图片变为图片图标
URL url = JButtonDemo01.class.getResource("btnicon.png");
ImageIcon imageIcon = new ImageIcon(url);
//把图标放在按钮上
JButton jButton = new JButton();
jButton.setIcon(imageIcon);
jButton.setToolTipText("图片图标按钮");
Container container = this.getContentPane();
container.add(jButton);
this.setVisible(true);
this.setSize(100,100);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JButtonDemo01();
}
}
单选按钮
package com.ym.lesson05;
import javafx.scene.control.RadioButton;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo02 extends JFrame {
public JButtonDemo02() {
Container container = this.getContentPane();
//将图片变为图片图标
URL url = JButtonDemo02.class.getResource("btnicon.png");
ImageIcon imageIcon = new ImageIcon(url);
//把图标放在按钮上
JButton jButton = new JButton();
jButton.setIcon(imageIcon);
//单选框
JRadioButton jRadioButton1 = new JRadioButton("jRadioButton1");
JRadioButton jRadioButton2 = new JRadioButton("jRadioButton2");
JRadioButton jRadioButton3 = new JRadioButton();
//把这三个按钮分到一个组里
ButtonGroup buttonGroup = new ButtonGroup();
buttonGroup.add(jRadioButton1);
buttonGroup.add(jRadioButton2);
buttonGroup.add(jRadioButton3);
container.add(jRadioButton1,BorderLayout.NORTH);
container.add(jRadioButton2,BorderLayout.CENTER);
container.add(jRadioButton3,BorderLayout.SOUTH);
this.setVisible(true);
this.setSize(100,100);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JButtonDemo02();
}
}
复选按钮
package com.ym.lesson05;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class JButtonDemo03 extends JFrame {
public JButtonDemo03() {
Container container = this.getContentPane();
//将图片变为图片图标
URL url = JButtonDemo03.class.getResource("btnicon.png");
ImageIcon imageIcon = new ImageIcon(url);
//把图标放在按钮上
JButton jButton = new JButton();
jButton.setIcon(imageIcon);
//复选框
JCheckBox jCheckBox1 = new JCheckBox("jCheckBox1");
JCheckBox jCheckBox2 = new JCheckBox("jCheckBox2");
container.add(jCheckBox1,BorderLayout.NORTH);
container.add(jCheckBox2,BorderLayout.SOUTH);
// this.setLayout(new FlowLayout(FlowLayout.LEFT));
// this.setLayout(new GridLayout(2,1));
this.setVisible(true);
this.setSize(100,100);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JButtonDemo03();
}
}
3.6 列表
下拉列表
package com.ym.lesson06;
import javafx.scene.control.ComboBox;
import javax.swing.*;
import java.awt.*;
public class ComboboxDemo extends JFrame {
public ComboboxDemo() {
Container container = this.getContentPane();
JComboBox status = new JComboBox();
status.addItem("就业");
status.addItem("考研");
status.addItem("考公");
container.add(status);
this.setVisible(true);
this.setBounds(10,10,100,100);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new ComboboxDemo();
}
}
列表框
package com.ym.lesson06;
import javax.swing.*;
import java.awt.*;
import java.util.Vector;
public class ComboboxDemo2 extends JFrame {
public ComboboxDemo2() {
Container container = this.getContentPane();
//生成列表的内容
String[] contents1={"ha","haha","哈哈哈"};
JList jList1 = new JList(contents1);
container.add(jList1,BorderLayout.NORTH);
Vector contents2 = new Vector();
contents2.add("la");
contents2.add("lala");
contents2.add("啦啦啦");
JList jList2 = new JList(contents2);
container.add(jList2,BorderLayout.SOUTH);
this.setVisible(true);
this.setBounds(10,10,100,100);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new ComboboxDemo2();
}
}
3.7 文本框
文本框，文本域和密码框
package com.ym.lesson06;
import javax.swing.*;
import java.awt.*;
import java.util.Vector;
public class TextDemo extends JFrame {
public TextDemo() {
Container container = this.getContentPane();
//文本框JTextField
JTextField jTextField = new JTextField("haha",8);
//文本域JTextArea
JTextArea jTextArea = new JTextArea("hahahahahha",8,8);
//密码框JPasswordField
JPasswordField jPasswordField = new JPasswordField("12345678",8);
JPanel jPanel = new JPanel();
jPanel.add(jTextField);
jPanel.add(jTextArea);
jPanel.add(jPasswordField);
JScrollPane jScrollPane = new JScrollPane(jPanel);
container.add(jScrollPane);
this.setVisible(true);
this.setBounds(10,10,100,100);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TextDemo();
}
}