Example usage for java.util Random Random

Introduction

In this page you can find the example usage for java.util Random Random.

Prototype

public Random()

Source Link

Document

Creates a new random number generator.

Usage

From source file:Main.java

public static String getRandomTAG(List<String> list) {
    Random random = new Random();
    int i = random.nextInt(list.size());
    return list.get(i);
}

From source file:Main.java

private static String randomMac() {
    String chars = "abcde0123456789";
    String res = "";
    Random rnd = new Random();
    int leng = chars.length();
    for (int i = 0; i < 17; i++) {
        if (i % 3 == 2) {
            res = res + ":";
        } else {/* w ww.  j a  v a 2  s  . com*/
            res = res + chars.charAt(rnd.nextInt(leng));
        }

    }
    return res;
}

From source file:Main.java

private static String randomMac1() {
    String chars = "ABCDE0123456789";
    String res = "";
    Random rnd = new Random();
    int leng = chars.length();
    for (int i = 0; i < 17; i++) {
        if (i % 3 == 2) {
            res = res + ":";
        } else {/*from  w w w.j  a v  a2s . co  m*/
            res = res + chars.charAt(rnd.nextInt(leng));
        }

    }
    return res;
}

From source file:Main.java

public static String getRandomString(int len) {
    String returnStr = "";
    char[] ch = new char[len];
    Random rd = new Random();
    for (int i = 0; i < len; i++) {
        ch[i] = (char) (rd.nextInt(9) + 97);
    }//  w w  w.  j  a  va 2  s.c  o m
    returnStr = new String(ch);
    return returnStr;
}

From source file:Main.java

public static int randomColor() {
    Random random = new Random();
    int r = random.nextInt(256);
    int g = random.nextInt(256);
    int b = random.nextInt(256);
    double color_perception = 1 - (0.299 * r + 0.587 * g + 0.114 * b) / 255;
    if (color_perception > 0.4) {
        return Color.argb(255, r, g, b);
    } else {//from   www  . ja v a 2  s  .co  m
        return randomColor();
    }
}

From source file:Main.java

public static int[] randomSort(int[] seed) {
    int len = seed.length;
    int[] result = new int[len];
    Random random = new Random();
    for (int i = 0; i < len; i++) {
        int r = random.nextInt(len - i);
        result[i] = seed[r];//w w  w .  ja  v  a  2 s  .  c  om
        seed[r] = seed[len - 1 - i];
    }
    return result;
}

From source file:Main.java

static int randomOneOrMinusOne() {
    Random rand = new Random();
    if (rand.nextBoolean())
        return 1;
    else//from w  ww .ja v a 2s  . c o m
        return -1;
}

From source file:Main.java

private static String randomSSID(int n) {
    String chars = "abcdeifABCDEIF0123456789";
    String res = "";
    Random rnd = new Random();
    int leng = chars.length();
    for (int i = 0; i < n; i++) {
        res = res + chars.charAt(rnd.nextInt(leng));

    }//from   w  ww  .  j ava 2 s  . co  m
    return res;
}

From source file:Main.java

public static int getRandomNumberByMaxNum(int maxNum) {
    if (maxNum == 0) {
        return getRandomNumber();
    }//from  w w  w  .  j  a v  a  2 s.co m
    return new Random().nextInt(maxNum) + 1;
}

From source file:Main.java

public static int generateRandomColor() {
    Random rnd = new Random();
    int r = rnd.nextInt(256);
    int g = rnd.nextInt(256);
    int b = rnd.nextInt(256);

    if ((r == 0 && g == 0 && b == 0) || (r == 255 && g == 255 && b == 255)) {
        return generateRandomColor();
    }/*ww  w. j  av a  2s .c om*/

    int color = Color.argb(30, r, g, b);

    return color;
}