3、Swing
3.1 窗口、面板
package com.wang.swing.jframe;
import javax.swing.*;
import java.awt.*;
//
public class JFrameDemo01 {
//现在窗口是被初始化出来的，要有init方法
public void init(){
//顶级窗口
JFrame jFrame = new JFrame("这是一个JFrame窗口");
jFrame.setVisible(true);
jFrame.setBounds(100,100,200,200);
JLabel jLabel = new JLabel("欢迎学java");
jFrame.add(jLabel);
//关闭事件 已经写好的方法
jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
//建立一个窗口
new JFrameDemo01().init();
new MyJFrame().init();
}
}
class MyJFrame extends JFrame{
public void init(){
this.setBounds(10,10,200,300);
this.setVisible(true);
//获得容器
Container contentPane = this.getContentPane();
contentPane.setBackground(Color.green);
//设置文字 JLabel
JLabel jLabel = new JLabel("欢迎学java");
this.add(jLabel);
//让文本标签居中
jLabel.setHorizontalAlignment(SwingConstants.CENTER);
}
}3.2 弹窗
package com.wang.swing.dialog;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//主窗口
public class DialogDemo01 extends JFrame {
public static void main(String[] args) {
new DialogDemo01().init();
}
//JFrame要写init方法
public void init(){
this.setVisible(true);
this.setSize(700,500);
//关闭事件
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
//JFrame中放东西需要容器
Container container = this.getContentPane();
//绝对布局
container.setLayout(null);
//需要按钮
JButton jButton = new JButton("点击弹出对话框");
jButton.setBounds(30,30,200,50);
//点击按钮的时候，弹出弹窗，所以需要监听事件
jButton.addActionListener(new ActionListener() {//监听器
@Override
public void actionPerformed(ActionEvent e) {
//弹窗
new MyDialog();
}
});
container.add(jButton);
}
}
//弹窗的窗口，弹窗也是一个新的 窗口
class MyDialog extends JDialog{
public MyDialog(){
this.setVisible(true);
this.setBounds(100,100,500,500);
//默认有关闭事件，不需要写 会报错 多余
Container container = this.getContentPane();
//container.setLayout(null); 有这句时"一起学java"显示不出来，原因？？
container.add(new JLabel("一起学java"));
}
}3.3 标签
label
图标 ICON
package com.wang.swing.lable;
import javax.swing.*;
import java.awt.*;
//图标是接口,需要实现类,是一个弹窗，所以要继承JFrame
public class IconDemo extends JFrame implements Icon {
private int width;
private int height;
public IconDemo(){
//无参构造
}
public IconDemo(int width,int height){
this.width=width;
this.height=height;
}
public static void main(String[] args) {
new IconDemo().init();
}
public void init(){
//类初始化
IconDemo iconDemo = new IconDemo(15, 15);
//图标放在标签上,也可以放在按钮上
JLabel jLabel = new JLabel("icontest", iconDemo, SwingConstants.CENTER);
//标签要用要放进容器
Container container = getContentPane();
container.add(jLabel);
this.setVisible(true);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
@Override
public void paintIcon(Component c, Graphics g, int x, int y) {
g.fillOval(x,y,width,height);
}
@Override
public int getIconWidth() {
return this.width;
}
@Override
public int getIconHeight() {
return this.height;
}
}
图片ImageIcon
package com.wang.swing.lable;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class ImageIconDemo extends JFrame {
public ImageIconDemo(){
//获取图片地址 通过类获取当前类下资源
JLabel jLabel = new JLabel("ImageIcon");
URL url = ImageIconDemo.class.getResource("tx.jpg");
ImageIcon imageIcon = new ImageIcon(url);
jLabel.setIcon(imageIcon);
//居中显示
jLabel.setHorizontalAlignment(SwingConstants.CENTER);
//获得容器
Container container = getContentPane();
container.add(jLabel);
setVisible(true);
setBounds(100,100,500,300);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new ImageIconDemo();
}
}
3.4 面板
JPanel
package com.wang.swing.jpanel;
import javax.swing.*;
import java.awt.*;
public class JPanelDemo extends JFrame {
public JPanelDemo(){
//所有东西要放在container中,获得container
Container container = this.getContentPane();
//container设置容器的样子 表格布局 后两个参数为每个面板之间的间距
container.setLayout(new GridLayout(2,1,10,10));
JPanel jPanel1 = new JPanel(new GridLayout(1,3));
JPanel jPanel2 = new JPanel(new GridLayout(1,2));
JPanel jPanel3 = new JPanel(new GridLayout(2,1));
JPanel jPanel4 = new JPanel(new GridLayout(3,2));
jPanel1.add(new JButton("jButton1-1"));
jPanel1.add(new JButton("jButton1-2"));
jPanel1.add(new JButton("jButton1-3"));
jPanel2.add(new JButton("jButton2-1"));
jPanel2.add(new JButton("jButton2-1"));
jPanel3.add(new JButton("jButton3-1"));
jPanel3.add(new JButton("jButton3-2"));
jPanel4.add(new JButton("jButton4-1"));
jPanel4.add(new JButton("jButton4-2"));
jPanel4.add(new JButton("jButton4-3"));
jPanel4.add(new JButton("jButton4-4"));
jPanel4.add(new JButton("jButton4-5"));
jPanel4.add(new JButton("jButton4-6"));
container.add(jPanel1);
container.add(jPanel2);
container.add(jPanel3);
container.add(jPanel4);
this.setVisible(true);
this.setSize(500,500);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JPanelDemo();
}
}
JScrollPanel 边框
package com.wang.swing.jpanel;
import javax.swing.*;
import java.awt.*;
public class JScrollPanelDemo extends JFrame {
public JScrollPanelDemo(){
Container container = this.getContentPane();
//文本域
JTextArea jTextArea = new JTextArea(20,50);//每一行写20个
jTextArea.setText("欢迎学习java");
//用Scroll面板
JScrollPane jScrollPane = new JScrollPane(jTextArea);
container.add(jScrollPane);
this.setVisible(true);
this.setBounds(100,100,500,300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JScrollPanelDemo();
}
}