Java shift all zero's to start of array

• In Java we can shift all zeros in array to start/left of array using for loop.

public class shiftZerosToStart {
    public static void main(String[] args) {
    int arr[] = { 0,1,3,40,-4,-6,0,7,0,-6};
    int temp; // creating temp variable
    for (int i = arr.length - 1; i >= 0; i--) { // loop start from last index position
        for (int j = i - 1; j >= 0; j--) {
            if (arr[i] == 0) { // condition to check if value is 0 in array
                // logic for swapping
                temp = arr[i];
                arr[i] = arr[j];
                arr[j] = temp;
            }
        }
    }
    System.out.println("Array after pushing zeros to the start of array: ");
    for (int n : arr) {
        System.out.print(n + " ");
    }
  }
}

Output:
Java shift all zero's to start of array
We can also achieve this by using for loops
public class shiftZerosToStart {
    public static void main(String[] args) {
    
        int arr[] = { 0,1,3,40,-4,-6,0,7,0,-6};

        int[] b=new int[arr.length];

        int start=0;
        int end=b.length-1;
        
        //loop-for storing 0's at start of array
        for(int i=0;i<arr.length;i++) {
            if(arr[i]==0) {
                b[start]=arr[i];
                start++;
            }
        }
        
        //loop-for storing values other than 0's after 0's filled in array
        for(int j=0;j<arr.length;j++) {
            if(arr[j]!=0) {
                b[start]=arr[j];
                start++;
            }
        }
        
        System.out.println("Array after pushing zeros to the start of array: ");
        for (int n : b) {
            System.out.print(n + " ");
        }
    }
}
Output:
Java shift all zero's to start of array
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