In Java, the this keyword is used to refer to the current object instance. In a constructor, the this keyword is used to differentiate between the member variables of a class and the parameters of the constructor that have the same name.
For example, consider the following class:
public class MyClass {
int num;
String str;
public MyClass(int num, String str) {
this.num = num;
this.str = str;
}
}
In the above example, the MyClass class has a parameterized constructor that takes two parameters, an integer num and a string str. The constructor initializes the member variables num and str with the values passed to it using the this keyword to refer to the current object instance.
By using this.num and this.str, we are explicitly stating that we want to set the values of the member variables of the current object instance to the values of the parameters passed to the constructor.
The this keyword is particularly useful in constructors when the parameter names are the same as the member variable names. It helps to avoid confusion and ensures that the member variables are properly initialized.
