The reference to the abstract class

Reference no: EM13167022

Class X defines method M1( ) as abstract. Class Y inherits from Class X and implements the method M1( ). Given the following code, explain why a reference to the abstract class X is allowed to refer to an object of the concrete class Y. Explain what happens when the reference to the abstract class X is used to execute method M1( ).

X obj = new Y( );

obj.M1( );

Reference no: EM13167022

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