What does this keyword do?

Answer 1

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The "this" keyword is simply a reference to the current object. If, for example, you wanted to add the object you're currently working in to a collection you would want to do something like:

// Collection c;

c.add(this); ---------------------------------------------------

actually,there are 3 uses of 'this' keyword: 1. to refer to the address of the object under consideration. 2. to avoid name space collision. 3. to call a constructor within another constructor.

Answer 2

The "this" keyword refers to the current instance of the current object the code is running in. Code running in a "static" context has no "this", as there is no instance of the object to refer to. For example, if you are processing a paint event, "this" will refer to the component that is currently being redrawn.

Answer 3

The this keyword is used to provide a reference to the current object within its class. The most common use is to clarify scope issues with local variables which have the same identifier as a class member.

Example:

class MyClass {

int myVariable = 10;

void f() {

// This myVariable has a different value than the class member

int myVariable = 50;

// When we try to print it out, Java will display 50, since it looks to the local

// variables first

System.out.println(myVariable);

// If we wanted to specify that we should use the class member, we

// can use this.myVariable to reference it. Java will print out 10 this time.

System.out.println(this.myVariable);

}

}

note : using this means I'm calling my self. think like this ang go on !!

Answer 4

this keyword is used in java for insilization of class variable

example

class javademo

{

int id;

string name;

string address;

public javademo(int id, string name, strint address)

{

this.id = id;

this.name = name;

this.addesss = address;

}

}

manoj sharma

NIIT jawahar nagar varanasi

Answer 5

To understand the "new" keyword, you must first understand a few other concepts of Object-Oriented Programming (OOP). First, you need to know about classes, which are a template for a model of data; in a video game, for example, a class might be a player, an enemy, or a room's layout. Secondly, you should know about a constructor, which allows a class to set values for the data contained in the class. Given these two pieces of information, the new keyword is a function assigns an area of unused memory for the instance to reside, then calls the constructor for that class, which will set all of the values of the instance.

Answer 6

The this keyword refers to the current instance of the object and can only be used in non-static member methods (it is passed to the function through a hidden reference parameter). Given that most member methods only operate upon the current instance, it would be tedious to access that instance's members explicitly, thus the current instance is always implied unless a member needs to be accessed through an explicit instance (such as an instance that was passed to the function via separate argument). The thiskeyword is typically only used when we need to pass the current instance to a static member function or to a non-member function, or to return a reference to the current instance from a non-static member function. It is not necessary to pass the current instance between non-static member functions given that it is already passed implicitly through the hidden this parameter.

Answer 7

Memory allocation.

The new keyword will create an object, and return a reference to the object.

Answer 8

Using this keyword in Java is a way of referencing something which has been used earlier in the program. This is very useful knowledge to have when the program is long.