1、输入两个数，求其加减乘除。用窗口的形式呈现

1 import javax.swing.JOptionPane; 2  3 public class JJCC { 4     public static void main(String[] args) 5     { 6         String firstNumber,secondNumber; 7         int number1,number2; 8         int he,cha,ji,shang; 9         firstNumber = JOptionPane.showInputDialog10                 ("input the first integer please");11         secondNumber = JOptionPane.showInputDialog12                 ("inout the second integer please");13         number1 = Integer.parseInt(firstNumber);14         number2 = Integer.parseInt(secondNumber);15         he = number1 + number2;16         cha = number1 - number2;17         ji = number1 * number2;18         shang = number1 / number2;19         JOptionPane.showMessageDialog(null, "number1 + number2 is "20                 +he+"\nnumber1 - number2 is "+cha+"\nnumber1 *"21                         + " number2 is "+ji+"\nnumber1 / number2 is "+shang22                         ,"Results", JOptionPane.PLAIN_MESSAGE);23     }24 }

 

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）

1 import javax.swing.JOptionPane; 2  3 public class RandomStr { 4 //    public void createRandomStr(int weishu) 5 //    { 6 //        String str = ""; 7 //        for(int i=1;i<=weishu;i++) 8 //        { 9 //            //生成一个表示a~z的ASCII的随机数10 //            int intValue = (int)(Math.random()*26+97);11 //            //将此随机数转化为其对应的字母并连接在str后面12 //            str = str + (char)intValue;13 //        }14 //    }15 16     public static void main(String[] args) {17     //生成一个6位的由小写字母组成的随机字符串    18         int weishu=6;19         String str = "";20         for(int i=1;i<=weishu;i++)21         {22             //生成一个表示a~z的ASCII的随机数23             int intValue = (int)(Math.random()*26+97);24             //将此随机数转化为其对应的字母并连接在str后面25             str = str + (char)intValue;26         }27     //随机字符串生成完毕28         String inputStr;29         inputStr = JOptionPane.showInputDialog("请输入以下验证码\n"+str);30         if(inputStr.equals(str))31         {32             JOptionPane.showMessageDialog(null, "验证成功");33         }34         else35         {36             JOptionPane.showMessageDialog(null, "抱歉，验证失败");37         }38     }39 40 }