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RandomString.java

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import java.util.Random;

// generate pesudorandom strings

class RandomString {

public static final int GENOME = 1;

public static final int LOWER = 2;

public static final int UPPER = 3;

private static char[] getAlphabets(int c) {

String s = "";

switch(c) {

case GENOME:

s = "ACTG";

break;

case UPPER:

s = "ABCDEFGHIJKLMNOPQRSUVWXYZ";

break;

case LOWER:

s = "abcdefghijklmnopqrstuvwxyz";

break;

default:

s = "Aa1";

break;

}

return s.toCharArray();

}

public static String nextString(int length, char[] alphabets) {

int upper = alphabets.length;

Random random = new Random();

StringBuffer sb = new StringBuffer();

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

int index = random.nextInt(upper);

sb.append(alphabets[index]);

}

return sb.toString();

}

public static String nextString(int length, int choice) {

char[] array = getAlphabets(choice);

return nextString(length, array);

}

public static void main(String[] args) {

int length = 10;

System.out.println(RandomString.nextString(length, RandomString.GENOME));

System.out.println(RandomString.nextString(length, RandomString.UPPER));

System.out.println(RandomString.nextString(length, RandomString.LOWER));

}