何时使用 Lambda 表达式的 Java 最佳实践

Question

I have a case where service which returns optional and that value is used only for the condition only and if true return success else throws an exception, so for this do I need to use a lambda expression.

Optional<MyClass> val = service.getMyclass();
if(val.isPresent) {
 //some operation
}else{
   //throw exception
}

Answer 1

try below given code.

Optional<MyClass> var = service.getMyclass();
MyClass val = var.orElseThrow(RuntimeException::new);