Swing如何向JPanel新增邊框？

下面的範例展示了如何在Java Swing應用程式中向JPanel新增邊框。

使用以下API -

• BorderFactory.createLineBorder() - 建立線條邊框。
• JPanel.setBorder(border) - 為JPanel設定所需的邊框。

範例

package com.yiibai.swingdemo;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.LayoutManager;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.Border;

public class AddBorder2JPanel {
   public static void main(String[] args) {
      createWindow();
   }

   private static void createWindow() {    
      JFrame frame = new JFrame("Swing如何向JPanel新增邊框(www.tw511.com)");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      createUI(frame);
      frame.setSize(560, 200);      
      frame.setLocationRelativeTo(null);  
      frame.setVisible(true);
   }

   private static void createUI(JFrame frame){
      //Create a border
      Border blackline = BorderFactory.createLineBorder(Color.black);
      JPanel panel = new JPanel();
      LayoutManager layout = new FlowLayout();  
      panel.setLayout(layout);       
      JPanel panel1 = new JPanel();
      String spaces = "                   ";
      panel1.add(new JLabel(spaces + " 向JPanel新增邊框 " + spaces));  
      panel1.setBorder(blackline);
      panel.add(panel1);
      frame.getContentPane().add(panel, BorderLayout.CENTER);    
   }
}

執行上面範例程式碼，得到以下結果：