Example usage for java.util Random nextInt

Introduction

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

Prototype

public int nextInt(int bound)

Source Link

Document

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Usage

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 . java2s . c o m*/
            res = res + chars.charAt(rnd.nextInt(leng));
        }

    }
    return res;
}

From source file:com.gst.infrastructure.documentmanagement.contentrepository.ContentRepositoryUtils.java

/**
 * Generate a random number between 5 to 16
 * /*from   w w w  .ja  v a  2s .  c  o  m*/
 * @return
 */
public static int generateRandomNumber() {
    final Random randomGenerator = new Random();
    return randomGenerator.nextInt(11) + 5;
}

From source file:Main.java

private static String genRandomString(int pLength) {
    Random r = new Random();
    String letter = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < pLength; i++) {
        sb.append(letter.charAt(r.nextInt(1000000) % (letter.length())));
    }/*ww  w.j  a  v a 2  s.co m*/
    return sb.toString();
}

From source file:Main.java

public static String getRandomUserId(int i) {
    Random random = new Random();
    StringBuilder stringbuilder = new StringBuilder(i);
    int j = 0;//from  w  w  w .  ja v a 2 s .  com
    do {
        if (j >= i)
            return stringbuilder.toString();
        stringbuilder.append((char) (48 + random.nextInt(10)));
        j++;
    } while (true);
}

From source file:com.linkedin.paldb.impl.GenerateTestData.java

public static Integer[] generateIntData(int count) {
    Integer[] res = new Integer[count];
    Random random = new Random(count + 34593263544354353l);
    for (int i = 0; i < count; i++) {
        res[i] = random.nextInt(1000000);
    }/* w  w  w  .  j  a va 2s.c  o  m*/
    return res;
}

From source file:graphgen.GraphGen.java

private static String generateGraph(int nodeCount, int edgeCount) {
    boolean edgesArray[][] = new boolean[nodeCount + 1][nodeCount + 1];
    Random rand = new Random();

    StringBuilder graphString = new StringBuilder("graph G {\n");
    int counter = 0;
    for (int i = 2; i <= nodeCount; i++) {
        int randomNode = rand.nextInt(i - 1) + 1;
        if (!edgeExists(edgesArray, i, randomNode)) {
            edgesArray[i][randomNode] = true;
            graphString.append(i).append(" -- ").append(randomNode).append(";\n");
            counter++;//from   w  w  w.  j  a v a2 s .c  o m
        }
    }
    while (counter < edgeCount) {
        int rN1 = rand.nextInt(nodeCount) + 1;
        int rN2 = rand.nextInt(nodeCount) + 1;
        if (!edgeExists(edgesArray, rN1, rN2)) {
            edgesArray[rN1][rN2] = true;
            graphString.append(rN1).append(" -- ").append(rN2).append(";\n");
            counter++;
        }

    }
    graphString.append("}");

    return graphString.toString();

}

From source file:Main.java

/**
 * Fills the array with random ints.  Values will be between min (inclusive) and
 * max (inclusive)./*  w  ww  .  j a va  2  s .co  m*/
 */
public static void genRandomInts(long seed, int min, int max, int array[]) {
    Random r = new Random(seed);
    for (int i = 0; i < array.length; i++) {
        long range = max - min + 1;
        array[i] = (int) (min + r.nextLong() % range);
    }
    array[r.nextInt(array.length)] = min;
    array[r.nextInt(array.length)] = max;
}

From source file:ch.ethz.inf.vs.android.g54.a4.util.SnapshotCache.java

/**
 * Returns snapshot at index modulo the length of the list, if index is < 0, it returns a random snapshot
 */// w w w  .j a  va2s.c o m
private static List<WifiReading> getSnapshot(int index, Context c) {
    String state = Environment.getExternalStorageState();

    if (Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        // We can at least read the external storage
        File root = c.getExternalCacheDir();
        File[] snapshotFiles = root.listFiles(new FilenameFilter() {

            public boolean accept(File dir, String filename) {
                if (filename.endsWith(FILE_EXTENSION)) {
                    return true;
                } else {
                    return false;
                }
            }
        });
        if (snapshotFiles.length > 0) {
            if (index < 0) {
                Random rand = new Random();
                index = rand.nextInt(snapshotFiles.length);
            } else {
                index = index % snapshotFiles.length;
            }
            try {
                // read file into a string
                FileInputStream fstream = new FileInputStream(snapshotFiles[index]);
                Log.d(TAG, snapshotFiles[index].getName());
                DataInputStream in = new DataInputStream(fstream);
                BufferedReader br = new BufferedReader(new InputStreamReader(in));
                String fileContents = "";
                String strLine;
                while ((strLine = br.readLine()) != null) {
                    fileContents += strLine;
                }

                // make a json array out of the string
                JSONArray json = new JSONArray(fileContents);

                // parse the json array
                return jsonToReadings(json);
            } catch (Exception e) {
                Log.e(TAG, "Could not read file.");
                return null;
            }
        } else {
            // there are no cached snapshots
            return null;
        }
    } else {
        // we cannot read the external storage
        return null;
    }
}

From source file:com.embeddedlapps.primeraversion.ListAdapterHolder.java

/**
 * Create Random Users/*from w w  w .j  a  v  a2 s .  co  m*/
 */
/*
private void createUserDetails() {
for (int i = 0; i < 100; i++) {
    final UserDetails mDetails = new UserDetails();
    mDetails.setName("Name " + i);
    mDetails.setIdIMagen(R.drawable.one);
    mDetails.setIdIMagen((i % 2) == 0 ? R.drawable.two : R.drawable.one);
        
    mUserDetails.add(mDetails);
}
}
*/
/*
 * Snippet from http://stackoverflow.com/a/363692/1008278
 */
public static int randInt(int min, int max) {
    final Random rand = new Random();
    return rand.nextInt((max - min) + 1) + min;
}

From source file:com.linkedin.paldb.impl.GenerateTestData.java

public static Object[] generateCompoundKeys(int count) {
    Object[] res = new Object[count];
    Random random = new Random(345);
    for (int i = 0; i < count; i++) {
        Object[] k = new Object[] { new Byte((byte) random.nextInt(10)), new Integer(i) };
        res[i] = k;/*from  w  w w.j a v  a2 s  . c  o m*/
    }
    return res;
}