Why will the variable and an accessory method return two different things under Inheritance? [duplicate]











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  • Overriding member variables in Java

    10 answers



  • Java inheritance fields [duplicate]

    5 answers




Here are two classes



class FirstClass { 

    int x;

    public FirstClass(int n){

        x=n;

    }

    int getx(){

        return x;

    }

}

class SecondClass extends FirstClass { 

    int x;

    public SecondClass(int n){

        super(n*2);

        x=n;

    }

    int getx(){

        return x;

    }

}


Yet if I do something like FirstClass obj = new SecondClass(5), obj.x is 10, and obj.getx() returns 5.



I'd either have expected getx() to be 5 and x to be 5, or getx() to be 10 and x to be 10. Why does the code work this way?






java inheritance







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 Nov 11 at 1:25


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  • Fields are not polymoprhic, only methods are (with exception of private, static or final ones)
    – Pshemo
    Nov 11 at 1:19

















up vote
0
down vote

favorite













This question already has an answer here:




  • Overriding member variables in Java

    10 answers



  • Java inheritance fields [duplicate]

    5 answers




Here are two classes



class FirstClass { 

    int x;

    public FirstClass(int n){

        x=n;

    }

    int getx(){

        return x;

    }

}

class SecondClass extends FirstClass { 

    int x;

    public SecondClass(int n){

        super(n*2);

        x=n;

    }

    int getx(){

        return x;

    }

}


Yet if I do something like FirstClass obj = new SecondClass(5), obj.x is 10, and obj.getx() returns 5.



I'd either have expected getx() to be 5 and x to be 5, or getx() to be 10 and x to be 10. Why does the code work this way?






java inheritance







share|improve this question













marked as duplicate by Andreas java
Users with the  java badge can single-handedly close java questions as duplicates and reopen them as needed.

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 Nov 11 at 1:25


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.















  • Fields are not polymoprhic, only methods are (with exception of private, static or final ones)
    – Pshemo
    Nov 11 at 1:19















up vote
0
down vote

favorite









up vote
0
down vote

favorite












This question already has an answer here:




  • Overriding member variables in Java

    10 answers



  • Java inheritance fields [duplicate]

    5 answers




Here are two classes



class FirstClass { 

    int x;

    public FirstClass(int n){

        x=n;

    }

    int getx(){

        return x;

    }

}

class SecondClass extends FirstClass { 

    int x;

    public SecondClass(int n){

        super(n*2);

        x=n;

    }

    int getx(){

        return x;

    }

}


Yet if I do something like FirstClass obj = new SecondClass(5), obj.x is 10, and obj.getx() returns 5.



I'd either have expected getx() to be 5 and x to be 5, or getx() to be 10 and x to be 10. Why does the code work this way?






java inheritance







share|improve this question














This question already has an answer here:




  • Overriding member variables in Java

    10 answers



  • Java inheritance fields [duplicate]

    5 answers




Here are two classes



class FirstClass { 

    int x;

    public FirstClass(int n){

        x=n;

    }

    int getx(){

        return x;

    }

}

class SecondClass extends FirstClass { 

    int x;

    public SecondClass(int n){

        super(n*2);

        x=n;

    }

    int getx(){

        return x;

    }

}


Yet if I do something like FirstClass obj = new SecondClass(5), obj.x is 10, and obj.getx() returns 5.



I'd either have expected getx() to be 5 and x to be 5, or getx() to be 10 and x to be 10. Why does the code work this way?





This question already has an answer here:




  • Overriding member variables in Java

    10 answers



  • Java inheritance fields [duplicate]

    5 answers







java inheritance




java inheritance






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asked Nov 11 at 1:09









bleh

11539




11539




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 Nov 11 at 1:25


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 Nov 11 at 1:25


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.














  • Fields are not polymoprhic, only methods are (with exception of private, static or final ones)
    – Pshemo
    Nov 11 at 1:19




















  • Fields are not polymoprhic, only methods are (with exception of private, static or final ones)
    – Pshemo
    Nov 11 at 1:19


















Fields are not polymoprhic, only methods are (with exception of private, static or final ones)
– Pshemo
Nov 11 at 1:19






Fields are not polymoprhic, only methods are (with exception of private, static or final ones)
– Pshemo
Nov 11 at 1:19



















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