count.java

自己编写的学习Java的示例代码

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

public class Count extends JFrame
{
	int i=0;
	String topButtons [] = new String[]{"BackSpace","   CE   ","   C   "};
	String leftButtons [] = new String[]{"MC","MR","MS","M+"};
	String centerButtons[] = new String[]{"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};
	JTextField text;
	public Count(){
		super("计算器");

		//TOP
		text = new JTextField(33);
		JPanel ptop = new JPanel();
		ptop.add(text);
		add("North",ptop);
		
		//Center
		JPanel p = new JPanel();
		
		JPanel pmain = new JPanel();
		pmain.setLayout(new BorderLayout(5,5));
		
		p.add(pmain);

		//上面
		JPanel pmain_top = new JPanel();
		pmain_top.setLayout(new FlowLayout(FlowLayout.RIGHT));
		for(i=0;i<topButtons.length;i++){
			JButton b = new JButton(topButtons[i]);
			pmain_top.add(b);
		}
		//左边
		JPanel pmain_left= new JPanel();
		pmain_left.setLayout(new GridLayout(0,1,5,5));
		for(i=0;i<leftButtons.length;i++){
			JButton b = new JButton(leftButtons[i]);
			pmain_left.add(b);
		}
		//中间
		JPanel pmain_center = new JPanel();
		pmain_center.setLayout(new GridLayout(4,5,5,5));
		for(i=0;i<centerButtons.length;i++){
			JButton b = new JButton(centerButtons[i]);
			pmain_center.add(b);
		}


		pmain.add("North",pmain_top);
		pmain.add("West",pmain_left);
		pmain.add("Center",pmain_center);
		
		add("Center",p);
		
		setSize(400,500);
		pack();
		setVisible(true);
	}
	public static void main(String args[]){
		new Count();
	}
}