Why this keyword is used

Question

Even i omitted this keyword in this program the program runs without any error

public class Vehicle {
private String color;

// Getter
public String getColor() {
return color;
}

// Setter
public void setColor(String c) {
this.color = c;
}
}

class Program {
public static void main(String[ ] args) {
Vehicle v1 = new Vehicle();
v1.setColor("Red");
System.out.println(v1.getColor());
}
}

rate my question if this question is good

Answer 1

this is reference to a current object which u r using

this keyword is passed implicitly even if don't mention.

one of the use of this keyword is suppose say if fuction parameter is same as class variable they u have to use this keyword

public void setColor(String color){

this.color = color;

}

this use to avoid error

Answer 2

this keyword can be used to refer to any member of the current object from within an instance Method or a constructor.

Answer 3

private String a="class variable";
public void doSomething(){
String a = "local variable";
System.out.println (a);
System.out.println (this.a);
}

Try to run this code and see the output. If we don't have "this" keyword, we couldn't print "class variable".

Answer 4

What keyword are you talking about

Answer 5

"this" keyword

Answer 6

we use variable's value in other class for using this keyword it is simple to use like: this.a,this.b

Answer 7

this keyword indicates the current object of the class, as you know this never be used with static variable/Attribute because it's memory allocation type is static.

n this used only for dynamic type of memory blocks/objects. now at the run time may be there are several objects/instances of current class, to identify and accessing Attributes and methods of the current object, we use 'this' keyword.

Answer 8

this key word is an implicit pointer to the object ur currently using since ur code runs with in a particular object itself it runs without this keyword.

Answer 9

this is like an object created for that class implicitly.. so using 'this' we can access the attributes and behaviour inside the class