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Code Block
public class TestWrapper1 {
 public static void main(String[] args) {
  //create an array list of integers, which each element
  //is more than 127
     ArrayList<Integer> list1 = new ArrayList<Integer>();
     for(int i=0;i<10;i++)
      list1.add(i+1000);
  //create another array list of integers, which each element
  //is the same with the first one
     ArrayList<Integer> list2 = new ArrayList<Integer>();
     for(int i=0;i<10;i++)
      list2.add(i+1000);    
        
     int counter = 0;
     for(int i=0;i<10;i++)
      if(list1.get(i).equals(list2.get(i))) counter++;
     //output the total equal number
     System.out.println(counter);
 }
}

Risk Assessment

The result is an undefined behaviorWe often use array list with primitive type, so it will exert  a potential security risk.

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