calculator.java

一个J2SE的简单入门

package 第八章;
import java.awt.*;
import javax.swing.*;
public class Calculator 
{

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO 自动生成方法存根
		JFrame frame= new CalculatorFrame();
		frame.show();
		
	}

}
class CalculatorFrame extends JFrame
{
	public CalculatorFrame()
	{
		setTitle("Calculator");
		setSize(200,200);
		Container contentPane= getContentPane();
		contentPane.add(new CalculatorPanel());
	}
}
class CalculatorPanel extends JPanel
{
	public CalculatorPanel()
	{
		setLayout(new BorderLayout());
		JPanel p= new JPanel();
		p.setLayout( new GridLayout(4,4));
		String buttons= "789/456*123-0.=+";
		for(int i=0; i<buttons.length();i++)
		{
			addButton(p,buttons.substring(i,i+1));
			
		}
		add(p,"Center");
	}

	public void addButton(Container c,String s)
	{
		JButton b= new JButton(s);
		c.add(b);
	}
}