Example usage for java.lang Math random

Introduction

In this page you can find the example usage for java.lang Math random.

Prototype

public static double random()

Source Link

Document

Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0 .

Usage

From source file:Main.java

public static String randomStr(long strLen) {

    char freshChar;
    String freshString;/*from ww  w  .java2 s .  com*/
    freshString = "";

    while (freshString.length() < (strLen - 1)) {

        freshChar = (char) (Math.random() * 128);
        if (Character.isLetter(freshChar)) {
            freshString += freshChar;
        }
    }

    return (freshString);

}

From source file:Main.java

public static int getRandomColor() {
    int size = sColorArray.size();
    int index = (int) (Math.random() * size);
    return sColorArray.get(index);
}

From source file:Main.java

public static long getRandomLong4() {
    Random rd = new Random();
    long l2 = 0;//from  ww w . j  a  v a  2 s  .  c om
    for (int i = 1; i < 100; i++) {
        long l1 = (int) (Math.random() * 9000 + 1000);
        l2 = rd.nextInt(9000) + 1000;
    }
    return l2;
}

From source file:Main.java

public static void invokeMethodFormRed5(String toUserId) {
    Date nowDate = new Date();
    String time = nowDate.getTime() + "" + (int) ((Math.random() * 100) % 100);
    message = time;//from www . j  a  v  a  2 s.c  o m
    //      connection.call("createMeeting", responder, User.id + "", toUserId, message);
    Log.d("DEBUG", "call createMeeting");
}

From source file:Main.java

public static String getRandomNumString(int length) {
    StringBuilder builder = new StringBuilder();
    for (int i = 0; i < length; i++) {
        builder.append(String.valueOf((int) (Math.random() * 10)));
    }//from  www.ja  v a 2  s  .c o m
    return builder.toString();
}

From source file:Main.java

public static Set<Integer> randomSetRange(int min, int max, int n) {
    Set<Integer> set = new HashSet<Integer>();
    while (set.size() < n) {
        int num = (int) (Math.random() * (max - min)) + min;
        set.add(num);/* w w w.  j  a va  2s .c  o  m*/
    }
    return set;

}

From source file:Main.java

/**
 * Pick a random index from a list of items
 * @param items - the collection of data
 * @return a index value between 0 and n-1
 *///www.  j  a  va2s.co  m
@SafeVarargs
public static <T> int randomIndex(T... items) {
    int picked = (int) (Math.random() * items.length);
    return picked;
}

From source file:Main.java

private static String justifyOperation(String s, float width, Paint p) {
    float holder = (float) (COMPLEXITY * Math.random());
    while (s.contains(Float.toString(holder))) {
        holder = (float) (COMPLEXITY * Math.random());
    }/*  w  ww .j  a v  a  2  s  .  co  m*/
    String holder_string = Float.toString(holder);
    float lessThan = width;
    int timeOut = 100;
    int current = 0;
    while ((p.measureText(s) < lessThan) && (current < timeOut)) {
        s = s.replaceFirst(" ([^" + holder_string + "])", " " + holder_string + "$1");
        lessThan = (p.measureText(holder_string) + lessThan) - p.measureText(" ");
        current++;
    }
    String cleaned = s.replaceAll(holder_string, " ");
    return cleaned;
}

From source file:Main.java

private static int getRandomNum() {
    return (int) (Math.random() * 0xFF);
}

From source file:Main.java

public static String getRandom(int num) {
    StringBuffer sbf = new StringBuffer();
    for (int i = 0; i < num; i++) {
        int random = (int) (Math.random() * (RANDOMS.length()));
        sbf.append(RANDOMS.charAt(random));
    }/*from  w w  w.  j  a  v a  2  s  . c om*/
    return sbf.toString();

}