Java Language-Does anyone understand the red words?

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import java.util.*; public class Main{ public static void main(String args[]){ int[] arr1=new int[20]; Random rand=new Random(); for(int i=0;i<20;i++){ arr1[i]=rand.nextInt(10)+1; } int arr2[]=new int[20]; arr2[0]=arr1[0]; for(int i=1;i<20;i++){ arr2[i]=arr1[1]+arr1[i-1]; } System.out.println("Arr1: "+Arrays.toString(arr1)); System.out.println("Arr2: "+Arrays.toString(arr2)); } }

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