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Can we return this keyword from a method in java?
The "this" keyword in Java is used as a reference to the current object, within an instance method or a constructor. Using this you can refer the members of a class such as constructors, variables, and methods.
Returning “this”
Yes, you can return this in Java i.e. The following statement is valid.
return this;
When you return "this" from a method the current object will be returned.
Example
In the following Java example, the class Student has two private variables name and age. From a method setValues() we are reading values from user and assigning them to these (instance) variables and returning the current object.
public class Student {
private String name;
private int age;
public Student SetValues(){
Scanner sc = new Scanner(System.in);
System.out.println("Enter the name of the student: ");
String name = sc.nextLine();
System.out.println("Enter the age of the student: ");
int age = sc.nextInt();
this.name = name;
this.age = age;
return this;
}
public void display() {
System.out.println("name: "+name);
System.out.println("age: "+age);
}
public static void main(String args[]) {
Student obj = new Student();
obj = obj.SettingValues();
obj.display();
}
}Output
Enter the name of the student: Krishna Kasyap Enter the age of the student: 21 name: Krishna Kasyap age: 21
Updated on: 29-Jun-2020
5K+ Views
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