技術標籤：JavaSwing基礎swing

（練習）彩色標籤

程式碼（版本1）：

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;

public class Demo {
	
	public static void main(String[] args)
 
 {
		MyFrame frame = new MyFrame("Demo");
		frame.setSize(300, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
}

class MyFrame extends JFrame{

	Container contentPane;

	public MyFrame(String title) {
		super(title);
		
		contentPane = getContentPane
 
();
		contentPane.setLayout(new FlowLayout());
		
		makeLabel("1", Color.RED);
		makeLabel("2", Color.BLUE);
		makeLabel("3", Color.GREEN);
		makeLabel("4", Color.GRAY);
	}
	
	public void makeLabel(String text, Color color) {
		JLabel label = new JLabel(text);
 

		//設定背景為非透明
		label.setOpaque(true);
		//設定背景尺寸
		label.setPreferredSize(new Dimension(60, 30));
		//設定背景顏色
		label.setBackground(color);
		//設定文字水平
		label.setHorizontalAlignment(SwingConstants.CENTER);
		contentPane.add(label);
	}
}

程式碼（版本2）：

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;

public class Demo2 {

	public static void main(String[] args) {
		MyFrame2 frame = new MyFrame2("Demo");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(300, 300);
		frame.setVisible(true);
	}
}

class MyFrame2 extends JFrame{
	
	public MyFrame2(String title) {
		super(title);
		
		Container contentPane = this.getContentPane();
		contentPane.setLayout(new FlowLayout());
		contentPane.add(new ColorfulLabel("1", Color.BLUE));
		contentPane.add(new ColorfulLabel("2", Color.RED));
		contentPane.add(new ColorfulLabel("3", Color.GREEN));
		contentPane.add(new ColorfulLabel("4", Color.GRAY));
	}
	
	private class ColorfulLabel extends JLabel{
		public ColorfulLabel(String text, Color color) {
			this.setText(text);
			this.setOpaque(true);
			this.setHorizontalAlignment(SwingConstants.CENTER);
			this.setPreferredSize(new Dimension(60, 30));
			this.setBackground(color);
		}
	}
}

輸出：