Question

I need help in java 
use anythitg except​ (Method , bollean )

Given nA and a[0], a[1], ..., a[nA - 1], give a segment of code that will
    copy the non-zero elements of array "a" into an array "b", "squeezing out the zeroes",
    and setting nB equal to the number of non-zero elements in b.
    That is, if nA=13 and the contents of a[i], where i = 0 to nA - 1 are 
    initially 
    0.0, 1.2, 0.0, 0.0, 0.0, 2.3, 0.0, 9.7, 5.6, 0.0, 3.6, 0.0, 0.0 
    then after execution of the code the contents should be nB=5, b[0]=1.2, 
    b[1]=2.3, b[2]=9.7, b[3]=5.6, and b[4]=3.6.
  
        Note:
        You may assume both arrays are of type double.

Answer 1

Ans)

public class ArrayToArray {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       double[] a = {0.0,1.2,0.0,0.0,0.0,2.3,0.0,9.7,5.6,0.0,3.6,0.0,0.0};//Elements in array A
       int nA = a.length; //length of array a
       System.out.println("Size of array a is "+nA);//printing the size of an array a
       int count = 0,i; //initializing count and i
       for(i=0; i<a.length;i++){ //iterating the array a
           if(a[i] != 0){ //checking the non zero elements in array a
               count++; //if condition satisfies increment the count
           }
       }
       double[] b = new double[count]; //initialize an array b with size of the count which gives the size of num of non zero elements
       int y =0; //initialize y
           for(int k=0;k<a.length;k++){ //iterate the array a
               if(a[k] != 0 ){ //checking for non zero element in array a
                   b[y] = a[k]; //assigning the non zero element to array b
                   System.out.println(y+1 + " Element of array in b is "+b[y]); //printing the elements of array b
                   y++;// incrementing the y value
               }
           }
           int nB = b.length; // assigning thr length of array b to nB
           System.out.println("Size of array b is "+nB);//printing length of array b
       }
}

output:

Size of array a is 13 1 Element of array in b is 1.2 2 Element of array in b is 2.3 3 Element of array in b is 9.7 4 Element of array in b is 5.6 5 Element of array in b is 3.6 Size of array b is 5