class ArrayUtil{
public static int [] concat(int[] a,int[] b) {
a=a+b;
}
publc static void print(int[] a) {
System.out.print(a);
}
}
class Main{
public class StatixEx{
public static void main(String [] args) {
int []array1= {1,5,7,9};
int []array2= {3,6,-1,100,77};
int []array3= ArrayUtil.concat(array1,array2);
ArrayUtil.print(array3);
}
}