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

public static void main(String[] args) {
    int[] nums = new int[100];

    for (int i = 0; i < nums.length; ++i) {
        nums[i] = i + 1;//from  w w  w.  j  av a2s. c om
    }

    Random generator = new Random();
    for (int i = 0; i < nums.length; ++i) {
        int arrayIndex = generator.nextInt(nums.length - i);
        int tmp = nums[nums.length - 1 - i];
        nums[nums.length - 1 - i] = nums[arrayIndex];
        nums[arrayIndex] = tmp;
    }
    System.out.println(Arrays.toString(nums));
}

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From source file:Main.java

public static void main(String[] args) {
    int[][] array = new int[2][10];
    Random rand = new Random();
    for (int i = 0; i < 10; i++) {
        array[0][i] = i;//  w w w . ja v a 2 s .  com
        array[1][i] = (int) rand.nextInt(3) + 1;
    }

    System.out.println(Arrays.deepToString(array));

}

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From source file:Main.java

public static void main(String[] args) {
    Random num = new Random();
    int num0, num1, num2, num3, num4, num5, num6, num7;

    num0 = num.nextInt(7) + 1;
    num1 = num.nextInt(8);/*w  ww.  java2s .  co m*/
    num2 = num.nextInt(8);
    num3 = num.nextInt(643) + 101;
    num4 = num.nextInt(10);
    num5 = num.nextInt(10);
    num6 = num.nextInt(10);
    num7 = num.nextInt(10);

    String randnum = "A random phone number: ";
    System.out.print(randnum);
    System.out.print(num0);
    System.out.print(num1);
    System.out.print(num2);
    System.out.print("-" + num3 + "-");
    System.out.print(num4);
    System.out.print(num5);
    System.out.print(num6);
    System.out.println(num7);
}

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From source file:Main.java

public static void main(final String[] args) throws Exception {
    Random random = new Random();
    Set<Integer> intSet = new HashSet<>();
    while (intSet.size() < 6) {
        intSet.add(random.nextInt(49) + 1);
    }/*from  w  w  w  . jav a2 s .  c  o m*/
    Integer[] ints = intSet.toArray(new Integer[intSet.size()]);
    System.out.println(Arrays.toString(ints));
}

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From source file:MainClass.java

public static void main(String[] args) {
    Random generator = new Random();

    for (int i = 0; i < 10; i++)
        data[i] = 10 + generator.nextInt(90);

    Arrays.sort(data);//  w  w  w.  j a  va  2  s. c  o m

    System.out.println(binarySearch(3));
}

---

From source file:com.prl.sort.InsertSort.java

/**
 * @param args/*from   w  w  w. j a v a2s  .c  o  m*/
 */
public static void main(String[] args) {
    Integer[] arr = new Integer[10];
    Random random = new Random();
    int index = 0;
    while (true) {
        int num = random.nextInt(100) + 1;
        arr[index++] = num;
        if (index > 9) {
            break;
        }
    }

    System.out.println(StringUtils.join(arr, ","));

    int temp = 0;
    for (int i = 1; i < arr.length; i++) {
        int j = i - 1;
        temp = arr[i]; // ?
        // ???????
        for (; j >= 0 && arr[j] > temp; j--) {
            arr[j + 1] = arr[j];
            arr[j] = temp;
        }
    }

    System.out.println(StringUtils.join(arr, ","));
}

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From source file:Main.java

public static void main(String[] args) {

    Random rand = new Random();

    int randnumb;
    int array[] = new int[5];
    for (int j = 0; j <= 4; j++) {
        randnumb = 1 + rand.nextInt(11);
        array[j] = randnumb;// www .  j  ava 2 s.  c  o m
    }
    System.out.println(Arrays.toString(array));

}

---

From source file:Main.java

public static void main(String[] args) {
    char array[][] = new char[5][5];
    Random rnd = new Random();
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 5; j++) {
            int x = rnd.nextInt(5); // 0 to 4
            switch (x) {
            case 0: {
                array[i][j] = 'a';
                break;
            }//  w w w. jav a  2s  . com
            case 1: {
                array[i][j] = 'b';
                break;
            }
            case 2: {
                array[i][j] = 'c';
                break;
            }
            case 3: {
                array[i][j] = 'd';
                break;
            }
            case 4: {
                array[i][j] = 'e';
                break;
            }
            }
        }
    }
    System.out.println(Arrays.deepToString(array));
}

---

From source file:Main.java

public static void main(String args[]) {
    int rnd;//  www . jav  a2 s.  c  om
    Random rand = new Random();
    int[] nums = new int[50];

    boolean[] check = new boolean[50];

    for (int k = 0; k < 50; k++) {
        rnd = rand.nextInt(50);
        //check if the check array index has been set
        //if set regenerate since it is duplicate 
        while (check[rnd]) {
            rnd = rand.nextInt(50);
        }
        nums[k] = rnd;
        check[rnd] = true;
    }
    System.out.println(Arrays.toString(nums));

}

---

From source file:io.druid.query.aggregation.datasketches.quantiles.GenerateTestData.java

public static void main(String[] args) throws Exception {
    Path buildPath = FileSystems.getDefault().getPath("doubles_build_data.tsv");
    Path sketchPath = FileSystems.getDefault().getPath("doubles_sketch_data.tsv");
    BufferedWriter buildData = Files.newBufferedWriter(buildPath, StandardCharsets.UTF_8);
    BufferedWriter sketchData = Files.newBufferedWriter(sketchPath, StandardCharsets.UTF_8);
    Random rand = new Random();
    int sequenceNumber = 0;
    for (int i = 0; i < 20; i++) {
        int product = rand.nextInt(10);
        UpdateDoublesSketch sketch = UpdateDoublesSketch.builder().build();
        for (int j = 0; j < 20; j++) {
            double value = rand.nextDouble();
            buildData.write("2016010101");
            buildData.write('\t');
            buildData.write(Integer.toString(sequenceNumber)); // dimension with unique numbers for ingesting raw data
            buildData.write('\t');
            buildData.write(Integer.toString(product)); // product dimension
            buildData.write('\t');
            buildData.write(Double.toString(value));
            buildData.newLine();/*w  ww. j a v a 2 s  . c  om*/
            sketch.update(value);
            sequenceNumber++;
        }
        sketchData.write("2016010101");
        sketchData.write('\t');
        sketchData.write(Integer.toString(product)); // product dimension
        sketchData.write('\t');
        sketchData.write(Base64.encodeBase64String(sketch.toByteArray(true)));
        sketchData.newLine();
    }
    buildData.close();
    sketchData.close();
}

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