检查字符串是否在字符串的 ArrayList 中

Question

How can I check if a String is there in the List ?

I want to assign 1 to temp if there is a result, 2 otherwise.

My current code is:

Integer temp = 0;
List<String> bankAccNos = new ArrayList<String>();//assume list contains values
String bankAccNo = "abc";
for(String no : bankAccNos)
    if(no.equals(bankAccNo))
        temp = 1;

Answer 1

temp = bankAccNos.contains(no) ? 1 : 2;

Answer 2

The List interface already has this solved.

int temp = 2;
if(bankAccNos.contains(bakAccNo)) temp=1;

More can be found in the documentation about List .

Answer 3

    List list1 = new ArrayList();
    list1.add("one");
    list1.add("three");
    list1.add("four");

    List list2 = new ArrayList();
    list2.add("one");
    list2.add("two");
    list2.add("three");
    list2.add("four");
    list2.add("five");


    list2.stream().filter( x -> !list1.contains(x) ).forEach(x -> System.out.println(x));

The output is:

two
five

Answer 4

*public class Demo {
   public static void main(String[] args) {
      List aList = new ArrayList();
      aList.add("A");
      aList.add("B");
      aList.add("C");
      aList.add("D");
      aList.add("E");
      if(aList.contains("C"))
         System.out.println("The element C is available in the ArrayList");
      else
         System.out.println("The element C is not available in the ArrayList");
      if(aList.contains("H"))
         System.out.println("The element H is available in the ArrayList");
      else
         System.out.println("The element H is not available in the ArrayList");
   }
}*

The Output will be:

The element C is available in the ArrayList The element H is not available in the ArrayList