Java示例从数组中查找公共元素

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]);

            }

         }

      }

   }

}