Why is this program not calling the sub class method? What is the concept behind it? I'm totally confused with this. Below is the code.

Super class

public class TV { public void checkType(TV b) { System.out.println("Its a TV"); } } 

Child class

public class LedTv extends TV { public void checkType(LedTv b) { System.out.println("Its a LED TV"); } } 

Test case to get the result

public class TestTV { public static void main(String argss[]) { TV a = new TV(); TV b = new LedTv(); a.checkType(a); b.checkType(b); } } 

Why is this program not calling the sub class method? What is the concept behind it? I'm totally confused with this. Below is the code.

Super class

public class TV { public void checkType(TV b) { System.out.println("Its a TV"); } } 

Child class

public class LedTv extends TV { public void checkType(LedTv b) { System.out.println("Its a LED TV"); } } 

Test case to get the result

public class TestTV { public static void main(String argss[]) { TV a = new TV(); TV b = new LedTv(); a.checkType(a); b.checkType(b); } } 

Both of the checkType method prints

Its a TV Its a TV