// {...}
// Method 1: basic structures
List<Integer> integers = Arrays.asList(1, 2, 3, 4, 5);
int integerToFind = 6;
boolean integerExists = integers.contains(integerToFind);
System.out.println("6 is the list: " + integerExists);
// Method 2: complex structures
List<User> users = getUsers();
String userToFind = "Bobby";
boolean userExists = users.stream().anyMatch(user -> userToFind.equals(user.name));
System.out.println("Bobby is in the list: " + userExists);
// Method 3: find the element that matches the condition
User bobby = users.stream()
.filter(user -> userToFind.equals(user.name))
.findFirst()
.orElse(null);
System.out.println("Bobby: " + bobby);
// {...}
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