運用BoxLayout來依序佈置每個元件

package test.swing.layout;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class TestBoxLayout extends JFrame {
	
	private JPanel contentPane;

	public static void main(String[] args) {
		TestBoxLayout frame = new TestBoxLayout();
		frame.setVisible(true);
	}
	
	public TestBoxLayout() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 420, 300);   //(左邊界,上邊界,宽度,長度)
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));   //(上,左,下,右)
		setContentPane(contentPane);
		
		//將Layout設為BoxLayout時,components會依序並列或並行放置於面板上,而且超過視窗寬度時不會換行
		contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.X_AXIS));
		
		JButton firstBtn = new JButton("按鈕 1");
		contentPane.add(firstBtn);
		
		JButton secondBtn = new JButton("按鈕 2");
		contentPane.add(secondBtn);
		
		JButton thirdBtn = new JButton("按鈕 3");
		contentPane.add(thirdBtn);
		
		JButton forthBtn = new JButton("按鈕 4");
		contentPane.add(forthBtn);
		
		JButton fifthBtn = new JButton("按鈕 5");
		contentPane.add(fifthBtn);
		
		JButton sixthBtn = new JButton("按鈕 6");
		contentPane.add(sixthBtn);		
	}

}

執行結果