Assigning all values to array on the whole [duplicate]

Question

I am writing a Java program and I am using the following code for assigning some variables to an array:

for(int j=1;j<P.maxNetworkPow;j++){
    node.succList[j]=node.succ.succList[j-1];
}

Who knows how can I assign the all values to the array without for loop?

Answer 1

Use Arrays.fill(node.succList, value) javadoc. If you want to fill array with one value.

If you want to init array from the other one use

System.arraycopy(Object src, int srcPos, Object dest, int destPos, int length) javadoc

Answer 2

Use System.arraycopy. Example as follows:

import java.lang.*;

public class SystemDemo {

   public static void main(String[] args) {

   int arr1[] = { 0, 1, 2, 3, 4, 5 };
   int arr2[] = { 5, 10, 20, 30, 40, 50 };

   // copies an array from the specified source array
   System.arraycopy(arr1, 0, arr2, 0, 1);
   System.out.print("array2 = ");
   System.out.print(arr2[0] + " ");
   System.out.print(arr2[1] + " ");
   System.out.print(arr2[2] + " ");
   System.out.print(arr2[3] + " ");
   System.out.print(arr2[4] + " ");
   }
}

will output: array2 = 0 10 20 30 40