Question

I am adding A, B and C to array list. how can I check if array list contains A, B and C than set id variable as 1. Or is there a better way to do this. I just want to set id variable as 1,2 or 3 depending upon the value inside Array list. For example if array list contains A, B and C than id = 1 and if array list contains A, B, C and D than id = 2;

Answer 1

You can use ArrayList.contains(Object elem) method for this purpose. It returns

true if the specified element is present; false otherwise.

A small code snippet to give you some idea.

int id = 0;
ArrayList<String> arraylist  = new ArrayList<String>();
arraylist.add("A");
arraylist.add("B");
arraylist.add("C");
if(arraylist.contains("A") && arraylist.contains("B"))
     id=1;
System.out.println(id)

So, Output = 1.