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Thread: Simple interface example giving erors

  1. #1
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    Default Simple interface example giving erors

    interface Test
    {
     
           final static int a,b;
     
     
           int compute(int a,int b);
     
     
     
    }
     
     
    class Sum implements Test
    {
     
    public int compute()
     
          {
      System.out.println("Inside subclass");
     
     
     
     
     public int compute(int x, int y)
     
          {
      System.out.println("Inside subclass");
    	return(x*y);
          }
     
     
     }
     
     
     
     
    class Interfacedemo 
    {
     
     public static void main(String args[])
      {
     
          System.out.println("Interface Example . . .");
     
     
     
          Test t;
     
          Sum s;
     
          t = s;
     
     
      System.out.println("Interface Example . . ." + t.compute(10,20));
     
     
       }
     
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Simple interface example giving erors

    You forgot to post the full text of the error message.

  3. #3
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    Default Re: Simple interface example giving erors

    C:\Users\Pushpendra\Desktop\Project\Interface>java c Interfacedemo.java
    Interfacedemo.java:4: = expected
    final static int a,b;
    ^
    Interfacedemo.java:4: = expected
    final static int a,b;
    ^
    Interfacedemo.java:25: illegal start of expression
    public int compute(int x, int y)
    ^
    3 errors

    C:\Users\Pushpendra\Desktop\Project\Interface>

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    Super Moderator Norm's Avatar
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    Default Re: Simple interface example giving erors

    Where did you get this example from?
    final static int a,b;
    Why do you have this statement in the interface?

    Interfacedemo.java:25: illegal start of expression
    The compiler is confused by what looks like the start of a new method within another method. You can not nest one method within another. Finish one with its ending } before starting another

  5. #5
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    Default Re: Simple interface example giving erors

    This is how i wrote again the code . . . but it got failed to execute correctly.

    interface Test
    {
     
          final  int a;
          final   int b;
     
           int compute(int a,int b);
     
     
     
    }
     
     
    class Sum implements Test
    {
     
     
     
       int compute(int x, int y)
     
          {
              System.out.println("Inside subclass");
     
    	return(x*y);
          }
     
     
     }
     
     
     
     
    class Interfacedemo 
    {
     
     public static void main(String args[])
      {
     
          System.out.println("Interface Example . . .");
     
     
     
          Test t;
     
          Sum s;
     
          t = s;
     
     
     
      System.out.println("Interface Example . . ." + t.compute(10,20));
     
     
       }
     
     
    }
    __________________________________________________ __________________-

    ERRORS
    __________________________________________________ ______________________

    Interfacedemo.java:4: = expected
    final int a;
    ^
    Interfacedemo.java:5: = expected
    final int b;
    ^
    2 errors

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Simple interface example giving erors

    Interfacedemo.java:4: = expected
    The compiler wants the variables to be assigned a value. That is done with the = followed by a value.
    Have you read the Tutorial on how to write an interface:
    Start here: // Trail: Learning the Java Language: Table of Contents (The Java™ Tutorials)
    and find interface

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