The "this" keyword in Java refers to the current object that is being operated on. It can be used to refer to instance variables and methods of the current object, as well as to invoke constructors of the current class.
Here are some common uses of the "this" keyword in Java:
To refer to instance variables: If a local variable in a method has the same name as an instance variable of the class, you can use the "this" keyword to refer to the instance variable. For example, if a class has an instance variable called "name", and a method has a local variable also called "name", you can use "this.name" to refer to the instance variable.
To invoke constructors: A constructor can be invoked from another constructor of the same class using the "this" keyword. This is useful when you have multiple constructors that initialize different sets of instance variables. For example, a class might have a constructor that takes only a name parameter, and another constructor that takes both a name and an age parameter. The second constructor could call the first constructor using "this(name)" to initialize the name instance variable, and then initialize the age instance variable.
To pass the current object as an argument: The "this" keyword can be used to pass the current object as an argument to another method. This is useful when you want to call a method on another object, but also need to pass the current object as an argument. For example, if a class has a method called "compare" that compares two objects of the same class, you can call it on the current object using "this.compare(otherObject)".
Overall, the "this" keyword is an important part of Java that allows you to work with instance variables and methods of the current object, as well as to invoke constructors and pass the current object as an argument.
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