what is the difference between this and super in java?
141730
As I said in the first line, the main difference between this and super in Java is that this represents current instance of a class, while super represent current instance of the parent class. ... Another use of this and super in Java is for accessing instance variables of a class and it's parent.
319641
In Java, a class can only extend one parent and therefore an enum cannot extend any other class (but implement interfaces – see below). Extending Enum means that every enum has a few methods that make it more usable: static values()
1250706
1) use == to compare primitive e.g. boolean, int, char etc, while use equals() to compare objects in Java. 2) == return true if two reference are of same object. Result of equals() method depends on overridden implementation.
1348909
The key difference between the two is that with static type checking, the type of variable is known at compile time (it checks the type of variable before running) while with dynamic type checking, the type of variable is known at runtime (it checks the type of variable while executing).
979143
['The is operator is used to check if the run-time type of an object is compatible with the given type or not whereas as operator is used to perform conversion between compatible reference types or Nullable types.', 'The is operator is of boolean type whereas as operator is not of boolean type.']
931737
super T denotes an unknown type that is a supertype of T (or T itself; remember that the supertype relation is reflexive). It is the dual of the bounded wildcards we've been using, where we use ? extends T to denote an unknown type that is a subtype of T.
1419269
Subclassing and Inheritance. Classes in Java exist in a hierarchy. A class in Java can be declared as a subclass of another class using the extends keyword. A subclass inherits variables and methods from its superclass and can use them as if they were declared within the subclass itself: ... They are inherited from Animal ...
373306
This compilation error is caused because the super constructor is undefined. In Java, if a class does not define a constructor, compiler will insert a default one for the class, which is argument-less. If a constructor is defined, e.g. Super(String s), compiler will not insert the default argument-less one.
505206
this is a reference to the object on which behalf the current method was invoked. this(anything) is an invocation of constructor. this("stackoverflow"); is calling the other constructor in the class (this is called a delegated constructor).
995585
Java is pass by value - always. You pass references, not objects. References are passed by value. You can change the state of a mutable object that the reference points to in a function that it is passed into, but you cannot change the reference itself.
492558
Difference: implements means you are using the elements of a Java Interface in your class. extends means that you are creating a subclass of the base class you are extending. You can only extend one class in your child class, but you can implement as many interfaces as you would like.
467135
Overloading is when you have the same function name that takes different parameters. Overriding is when a child class replaces a parent's method with one of its own (this in iteself does not constitute polymorphism). ... This is because any child class can be used where a base class is defined.
805799
String is immutable whereas StringBuffer and StringBuilder are mutable classes. StringBuffer is thread-safe and synchronized whereas StringBuilder is not.
167502
self (just a property of the global window object) = window. ... So, within the inner function, "this" refers to the object calling the inner function while "self" refers to the object which called the outer function to create the reference to the inner function.
245351
In the getter you get a value, and in the setter you set it. Don't confuse the two." Replace getter and setter methods with corresponding properties. The property's name should be the same as its originating methods, but without "Get" and "Set".
1305737
Main difference is methods of a Java interface are implicitly abstract and cannot have implementations. ... Variables declared in a Java interface is by default final. An abstract class may contain non-final variables. Members of a Java interface are public by default.
724772
In general both equals() and “==” operator in Java are used to compare objects to check equality but here are some of the differences between the two: ... In simple words, == checks if both objects point to the same memory location whereas . equals() evaluates to the comparison of values in the objects.