random Chars - Java java.util

Java examples for java.util:Random String

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Description

random Chars

Demo Code


//package com.java2s;

public class Main {
    public static String lowerChars = "abcdefghijklmnopqrstuvwxyz";
    public static String upperChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    public static String numberChars = "0123456789";
    public static String specialChars = "`~!@#$%^&*()';:][/.,><?";

    public static String randomChars(int lowerCount, int upperCount,
            int numCount, int specialCount) {
        String str = "";
        for (int i = 0; i < lowerCount; i++) {
            char a = lowerChars.charAt((int) (Math.random() * lowerChars
                    .length()));/* ww  w. j av a2s.com*/
            str += a;
        }
        for (int i = 0; i < upperCount; i++) {
            char a = upperChars.charAt((int) (Math.random() * upperChars
                    .length()));
            str += a;
        }
        for (int i = 0; i < numCount; i++) {
            char a = numberChars.charAt((int) (Math.random() * numberChars
                    .length()));
            str += a;
        }
        for (int i = 0; i < specialCount; i++) {
            char a = specialChars
                    .charAt((int) (Math.random() * specialChars.length()));
            str += a;
        }
        System.out.println(str);
        return str;
    }
}

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