演示1

package labelJLabel;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.lang.reflect.Field;
import java.util.stream.Stream;

import javax.swing.*;

public class LabeJLabel换行 {
	
	static Frame frame ;
	static Label label001 , label002;
	static JLabel jlabel001 , jlabel002;
	
	static {
		try {
			frame = (Frame)Frame.class.getDeclaredConstructor(String.class).newInstance("LabeJLabel换行");
			frame.addWindowListener(new WindowAdapter() {
				@Override public void windowClosing(WindowEvent event) {System.exit(0);}
			});
			frame.setLayout(new GridLayout(0, 1, 5, 5));
			frame.setBounds(100, 50, 1600, 900);
			
		}catch(Throwable th) {th.printStackTrace();}
		
		label001=new Label("Label的换行用\\n\r\n换行没有用"); label001.setBackground(Color.red);
		
		label002 = new Label("""
				<html>
					<h1 style="color:red">label不能用Html</h1>
					<br/>
					<b style="font-size:30px; color:blue" > 不能用&lt;br/>换行 </b>
					<svg>
						<line x1="0" y1="0" x2="100%" y2="100%" stroke="black" strokewidth="10" />
					</svg>
				</html>
				""");
		label002.setBackground(Color.orange);
		
		jlabel001 = new JLabel("JLabel用\\n\r\n换行没有用"); jlabel001.setBackground(Color.yellow); jlabel001.setOpaque(true);;
		
		jlabel002 = new JLabel("""
				<html>
					<span style="color:red; font-size:30px;">JLabel竟然能用Html!!! 太帅了!</span>					<br/>
					<b style="font-size:30px; color:blue" > 用&lt;br/>换行 </b>
					<svg>
						<line x1="0" y1="0" x2="100%" y2="100%" stroke="black" strokewidth="10" />
					</svg>
					<div style="position:fixed; left:300px; top:10px; width:500px; height:50px; font-size:20px; background:#0099ff; border:10px solid black; border-radius:50%;" >html功能不完整</style>
					<script>alert()</script>
				</html>
				""");
		jlabel002.setOpaque(true); jlabel002.setBackground(Color.green);
		
		
		try {
			Field fields[] = Class.forName(new Throwable().getStackTrace()[0].getClassName()).getDeclaredFields();
			Stream.of(fields).forEach(field->{
				try {
					Component component = (Component)field.get(null);
					if(frame!=component) {
						frame.add(component);
					}
				} catch (Exception e) {e.printStackTrace(); }
			});
		}catch(Throwable th) {th.printStackTrace();}
		
		
		frame.setVisible(true);
		
	}
	public static void main(String...arguments) {}

}

在这里插入图片描述

javax.swing.JLabel 能使用html

演示1