JAVA

find first element of list java

final Object firstElement = list.stream()
  .findFirst()
  .orElse(new Object()) //Give a default value if there are no elements
  
final Object firstElement = list.stream()
  .findFirst()
  .orElseThrow(() -> new Exception()) //Throw an exception if there are no elements  

java list get first element

list.get(0);

java list get first element

set.iterator().next();

java list get first element

!list_or_set.isEmpty()

java get first node in a list

public Node<T> getFirst()