flowlayouttest.java

《JAVA程序设计教程》这本书的所有源代码

//FlowLayoutTest.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class FlowLayoutTest
{  
	public static void main(String[] args)
	{  
		if (args.length != 1)
		{
			System.out.println("Usage: java FlowLayoutTest NUMBER");
			System.exit(0);
		}

		String buttonString = args[0];
		
		//从命令行的参数输入得到显示的按钮数目
		int buttonNumber = Integer.parseInt(buttonString); 
		ButtonFrame frame = new ButtonFrame(buttonNumber);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
	}
}

class ButtonFrame extends JFrame
{
	public ButtonFrame(int buttonNumber)
	{
		buttons = buttonNumber;
		setTitle("FlowLayoutTest");
		setSize(WIDTH, HEIGHT);

		JPanel buttonPanel = new JPanel();
		
		//增加相应的按钮
		for (int i = 0; i < buttons; i++ )
		{
			JButton addButton = new JButton("add" + i);
			buttonPanel.add(addButton);
		}

		Container contentPane = getContentPane();
		contentPane.add(buttonPanel);
	}

	public static final int WIDTH = 350;
	public static final int HEIGHT = 200;
	private int buttons;
}