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

/**
 * Generate the random byte to be sent//  ww  w.j  a v  a 2  s .com
 * 
 * @return the random byte
 */
private static byte randomByte() {
    return (byte) (127 - new Random().nextInt(256));
}

From source file:Main.java

public static String getRandomStr(int len) {
    Random rd = new Random();
    String retStr = "";
    do {/*www.  ja  v  a 2s. c  om*/
        int rdGet1 = Math.abs(rd.nextInt()) % 10;

        int rdGet2 = Math.abs(rd.nextInt()) % 26 + 65;
        retStr = retStr + rdGet1 + (char) rdGet2;
    } while (retStr.length() < len);

    return retStr;
}

From source file:Main.java

public static List<Integer> randomChoose(int total, int selectedCount) {
    Random random = new Random();
    List<Integer> resultList = new ArrayList<Integer>();
    while (resultList.size() < selectedCount) {
        Integer randomNum = random.nextInt(total) + 1;
        if (!resultList.contains(randomNum)) {
            resultList.add(randomNum);//from w w  w  .  j  ava 2s.co  m
        }
    }
    return resultList;
}

From source file:Main.java

public synchronized static String getRandomCode(int length) {
    String sRand = "";
    for (int i = 0; i < length; i++) {
        Random random = new Random();
        String rand = String.valueOf(random.nextInt(10));
        sRand += rand;//w  w w .ja  va  2s. com
    }
    return sRand;
}

From source file:Main.java

public static String randomString(int length) {
    String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < length; i++) {
        int num = random.nextInt(62);
        buf.append(str.charAt(num));/*from   w  w  w. ja v a  2  s  . com*/
    }
    return buf.toString();
}

From source file:Main.java

public static GradientDrawable createBackgroundRandom() {
    Random rnd = new Random();
    int color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
    GradientDrawable gd = new GradientDrawable();
    gd.setColor(color);/*from  w  w  w  . j a v  a 2  s.  c  om*/
    gd.setCornerRadius(5);
    gd.setAlpha(90);
    return gd;
}

From source file:Main.java

public static int randomNumber(int num) {
    if (count++ > 8) {
        r = new Random();
    }/*w ww. ja va2  s . c  o m*/
    return r.nextInt(num);
}

From source file:Main.java

public static String get_Random_Color() {
    String[] arr = { "#f44336", "#ff4081", "#ff5722", "#ff9800", "#03a9f4", "#009688", "#388e3c" };
    Random rand = new Random();
    int max = 5;/*from w w w.j ava 2 s.  c  o  m*/
    int min = 0;
    int num = rand.nextInt((max - min) + 1 + min);
    return arr[num];
}

From source file:Main.java

public static String getRandomKey(int length) {
    String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer sb = new StringBuffer();

    for (int i = 0; i < length; ++i) {
        int number = random.nextInt(str.length() - 1);//[0,62)

        sb.append(str.charAt(number));/*  ww  w .ja v a  2  s .  c  om*/
    }
    return sb.toString();
}

From source file:Main.java

public static String getRandomString(int length) {
    String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    Random random = new Random();
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < length; i++) {
        int number = random.nextInt(62);
        sb.append(str.charAt(number));/*from   w ww. j a  v a  2s. co  m*/
    }
    return sb.toString();
}