Copying arrays

public class CopyingArrays {
    public static void main(String[] args){
        // copying arrays using a loop
        int[] sourceArray = new int[10];

        // intialize sourceArray with even numbers
        int count=0;
        for (int i=0; count <sourceArray.length; i++){
            int num = (int)(Math.random() * 31);
                if (num % 2== 0){
                    sourceArray[count]= num;
                    count++;
                }
            }

        int[] targetArray= new int[10];
        for (int i=0; i<sourceArray.length; i++)
            targetArray[i]= sourceArray[i];

        // using the Arrays class arraycopy method
        String[] gems ={"Diamond", "Ruby", "Emerald", "Opal", "Sapphire"};
        String[] gemsStorage= new String[10];
        System.arraycopy(gems, 0, gemsStorage, 0, gems.length);

        }
    }