JAVA gets an instance of a random number that contains strings in the range 0 9 a z and a z

Get a random string in the range of 0-9,a-z, and a-z

/**

* JAVA To obtain 0-9,a-z,A-Z Range of random Numbers 

* @param length  Random number length 

* @return String

*/

public static String getRandomChar(int length) {

char[] chr = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',

'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',

'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};

Random random = new Random();

StringBuffer buffer = new StringBuffer();

for (int i = 0; i < length; i++) {

buffer.append(chr[random.nextInt(62)]);

}

return buffer.toString();

}

public static String getRandomChar() {

return getRandomChar(10);

}

Get a random number from 0 to 9

/**

* JAVA To obtain 0-9 The random number   The default length is 10

*

* @return String

*/

public static String getRandomNumber() {

return getRandomNumber(10);

}

Third, JAVA to get 0-9 random Numbers another implementation

/**

* JAVA To obtain 0-9 The random number 

*

* @param length

* @return String

*/

public static String getRandomNumber(int length) {

Random random = new Random();

StringBuffer buffer = new StringBuffer();

for (int i = 0; i < length; i++) {

buffer.append(random.nextInt(10));

}

return buffer.toString();

}