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Java Array Exercises: Separate 0s on left side and 1s on right side of an array of 0s and 1s in random order

Java Array: Exercise-51 with Solution

Write a Java program to separate 0s on left side and 1s on right side of an array of 0s and 1s in random order.

Pictorial Presentation:

Java Array Exercises: Separate 0s on left side and 1s on right side of an array of 0s and 1s in random order

Sample Solution:

Java Code:

import java.util.Arrays;

public class Main {
    public static void main(String[] args)
    {
        int arr[] = new int[]{ 0, 0, 1, 1, 0, 1, 1, 1,0 };
        int result[];
        System.out.println("Original Array ");
        System.out.println(Arrays.toString(arr));

        int n = arr.length;
 
        result = separate_0_1(arr, n);
        System.out.println("New Array ");
        System.out.println(Arrays.toString(result));
      }
    
    static int [] separate_0_1(int arr[], int n)
     {
        int count = 0;   
     
        for (int i = 0; i < n; i++) {
            if (arr[i] == 0)
                count++;
        }
 
        for (int i = 0; i < count; i++)
            arr[i] = 0;
 
        for (int i = count; i < n; i++)
            arr[i] = 1;
    
         return arr;
     }       
   }

Sample Output:

                                                                              
Original Array 
[0, 0, 1, 1, 0, 1, 1, 1, 0]
New Array 
[0, 0, 0, 0, 1, 1, 1, 1, 1]

Flowchart:

Flowchart: Separate 0s on left side and 1s on right side of an array of 0s and 1s in random order

Visualize Java code execution (Python Tutor):


Java Code Editor:

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Previous: Write a Java program to sort an array of positive integers of a given array, in the sorted array the value of the first element should be maximum, second value should be minimum value, third should be second maximum, fourth second be second minimum and so on.
Next: Write a Java program to separate even and odd numbers of a given array of integers. Put all even numbers first, and then odd numbers.

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Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

Ref: https://bit.ly/3kCAgLb