month.java

查一个月多少天

/*
 * month.java
 *
 * Created on 2007年4月4日, 下午10:22
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package month;

/**
 *
 * @author mgc
 */
import java.awt.*;
import java.awt.event.*;
public class month {
    public static void main(String args[])
    {
        new FrameInOut();
    }
    
}
class FrameInOut extends Frame implements ActionListener
{
    Label prompt,output;
    TextField input;
    FrameInOut()
    {
        super("月份天数显示程序");
        prompt=new Label("请输入月份:");
        input=new TextField(6);
        output=new Label("                                          ");
        setLayout(new FlowLayout());
        add(prompt);
        add(input);
        add(output);
        input.addActionListener(this);
        setSize(300,200);
        show();
    }
    public void actionPerformed(ActionEvent e)
    {
        int m,day;
        m=Integer.parseInt(input.getText());
        if (m>=1 && m<=12)
        {
            switch(m)
            {
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12: day=31;break;
                case 2: day=28;break;
                default:day=30;
            }
            output.setText(m+"月有"+day+"天");
        }
        else
        {
            output.setText("输入错误,请重新输入!");
            input.setText("");
        }
    }
}