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Thread: Java How to design - Interface Usage?

  1. #1
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    Default Java How to design - Interface Usage?

    I have a class as shown below.

    This class has a method addFilter with 2 parameters (type String and type Command1 )
    public class Command1 {
    public StringBuffer addFilter(String query, Command1 dataBase) {

    //concrete implementation

    return query;

    }
    }

    I have another class Command2. Here I need a similar method. The only difference is in the type of parameters passed. (type String and type Command).

    public class Command2 {
    //TO DO:
    public StringBuffer addFilter(String query, Command2 cmd) {

    //concrete implementation

    return query;

    }
    }

    I have started by using Interface
    public interface Helper {

    public StringBuffer addFilter(String query, XXXXX parameter2);

    }

    I would like the classes Command1 and Command2 to implement the interface Helper and override it these two public classes.
    However my problem is in dealing with the 2nd parameter. Am I right in my approach? Can anybody tell me how do I handle this issue?


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Java How to design - Interface Usage?

    What issue are you talking about? I'm really not sure what you're asking here.
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  3. #3
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    Default Re: Java How to design - Interface Usage?

    public class Command1 implements Helper{

    //I need to pass the 2nd paramter as type Command1
    @Override
    public StringBuffer addFilter(String query, Command1 dataBase) {

    //concrete implementation

    return query;

    }
    }

    public class Command2 {
    //TO DO:
    //I need to pass the 2nd paramter as type Command2
    @Override
    public StringBuffer addFilter(String query, Command2 cmd) {

    //concrete implementation

    return query;

    }
    }

    public interface Helper {

    //What should the type of XXXXX be??
    public StringBuffer addFilter(String query, XXXXX parameter2);

    }

    --- Update ---

    public class Command1 implements Helper{

    //need to pass the 2nd paramter as type Command1 ??
    @Override
    public StringBuffer addFilter(String query, Command1 dataBase) {

    //concrete implementation

    return query;

    }
    }

    public class Command2 implements Helper{
    //TO DO:
    //need to pass the 2nd paramter as type Command2

    @Override
    public StringBuffer addFilter(String query, Command2 cmd) {

    //concrete implementation

    return query;

    }
    }

    public interface Helper {

    //What should the type of XXXXX be??
    public StringBuffer addFilter(String query, XXXXX parameter2);

    }

  4. #4
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Java How to design - Interface Usage?

    When posting code, please use the highlight tags to preserve formatting.

    You tell us. What type should it be? What does that method do? What have you tried?
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