Javad Kouhi
5
Q:

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  
2
list.get(0);
0
set.iterator().next();
0
!list_or_set.isEmpty()
0
ArrayList<Type> array = new ArrayList<Type>();
System.out.printLn(array[0]);
1

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