编程实现用户名和密码自动生成【可以自己指定长度】

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也不是不可以，你用个随机数random类生成string随机数，用两个string包装类去赋值，不就可以了

Java code

    
    
    
    

     
     
     
     /**
   * 产生随机字符串
   * */
private static Random randGen = null;
private static char[] numbersAndLetters = null;
private static Object initLock = new Object(); 
public static final String randomString(int length) {
         if (length < 1) {
             return null;
         }
         if (randGen == null) {
             synchronized (initLock) {
                 if (randGen == null) {
                     randGen = new Random();
                     numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" +
                     "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
                     //numbersAndLetters = ("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
                 }
             }
         }
         char [] randBuffer = new char[length];
         for (int i=0; i<randBuffer.length; i++) {
             randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
          //randBuffer[i] = numbersAndLetters[randGen.nextInt(35)];
         }
         return new String(randBuffer);
}

    
    
    
    

------回答---------

------其他回答（20分）---------

也不是不可以，你用个随机数random类生成string随机数，用两个string包装类去赋值，不就可以了

Java code

    
    
    
    

     
     
     
     /**
   * 产生随机字符串
   * */
private static Random randGen = null;
private static char[] numbersAndLetters = null;
private static Object initLock = new Object(); 
public static final String randomString(int length) {
         if (length < 1) {
             return null;
         }
         if (randGen == null) {
             synchronized (initLock) {
                 if (randGen == null) {
                     randGen = new Random();
                     numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" +
                     "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
                     //numbersAndLetters = ("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
                 }
             }
         }
         char [] randBuffer = new char[length];
         for (int i=0; i<randBuffer.length; i++) {
             randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
          //randBuffer[i] = numbersAndLetters[randGen.nextInt(35)];
         }
         return new String(randBuffer);
}