You just need nested loop, that will surve the purpose,
public class HelloWorld {
public static void main(String a[]) {
int[] arr1 = {4,7,3,9,2};
int[] arr2 = {3,2,12,9,40,32,4};
for(int i = 0;i < arr1.length; i++) {
for(int j = 0; j < arr2.length; j++) {
if(arr1[i] == arr2[j]) {
System.out.println(arr1[i]);
}
}
}
}
}