两个小的java程序，用于练习java基本语法

1、输入两个数，求其加减乘除。用窗口的形式呈现

import javax.swing.JOptionPane;

public class JJCC {
    public static void main(String[] args)
    {
        String firstNumber,secondNumber;
        int number1,number2;
        int he,cha,ji,shang;
        firstNumber = JOptionPane.showInputDialog
                ("input the first integer please");
        secondNumber = JOptionPane.showInputDialog
                ("inout the second integer please");
        number1 = Integer.parseInt(firstNumber);
        number2 = Integer.parseInt(secondNumber);
        he = number1 + number2;
        cha = number1 - number2;
        ji = number1 * number2;
        shang = number1 / number2;
        JOptionPane.showMessageDialog(null, "number1 + number2 is "
                +he+"\nnumber1 - number2 is "+cha+"\nnumber1 *"
                        + " number2 is "+ji+"\nnumber1 / number2 is "+shang
                        ,"Results", JOptionPane.PLAIN_MESSAGE);
    }
}

 

2、生成一个6位的随机字符串验证码（以窗口的形式）（位数可改）

import javax.swing.JOptionPane;

public class RandomStr {
//    public void createRandomStr(int weishu)
//    {
//        String str = "";
//        for(int i=1;i<=weishu;i++)
//        {
//            //生成一个表示a~z的ASCII的随机数
//            int intValue = (int)(Math.random()*26+97);
//            //将此随机数转化为其对应的字母并连接在str后面
//            str = str + (char)intValue;
//        }
//    }

    public static void main(String[] args) {
    //生成一个6位的由小写字母组成的随机字符串    
        int weishu=6;
        String str = "";
        for(int i=1;i<=weishu;i++)
        {
            //生成一个表示a~z的ASCII的随机数
            int intValue = (int)(Math.random()*26+97);
            //将此随机数转化为其对应的字母并连接在str后面
            str = str + (char)intValue;
        }
    //随机字符串生成完毕
        String inputStr;
        inputStr = JOptionPane.showInputDialog("请输入以下验证码\n"+str);
        if(inputStr.equals(str))
        {
            JOptionPane.showMessageDialog(null, "验证成功");
        }
        else
        {
            JOptionPane.showMessageDialog(null, "抱歉，验证失败");
        }
    }

}