Implementing Interface

[mew]

I have written following interface with 3 abstract methods. Now class implementing this interface have to overwrite all of these 3 methods.

Code:

public interface Mapper {
	public void createSchema();
	public int getNoOfClasses();
        public void setHost(String hostName);
}

I have a situation where one class should implement all of these 3 methods and other should only implement createSchema method. How this is possible using this interface.

[ldb88]

The other class should not implement this interface if it shouldn't implement all the functions. You could just put something like

Code:

public int getNoOfClasses(){
}

depending on what is required. It might be better if you had two interfaces.

[hardwired]

You must provide the method declaration for each method defined in the implemented interface. What you do in the method body is up to you.
In pseudo code:

Code:

public interface Mapper {
    public void createSchema();
    public int getNoOfClasses();
    public void setHost(String hostName);
}

class NeedAllMethods implements Mapper {
    public void createSchema() {
        // implementation...
    }

    public int getNoOfClasses() {
        // implementation...
        return intValue;
    }

    public void setHost(String hostName) {
        // implementation...
    }
}

class NeedOnlyOne implements Mapper {
    public void createSchema() {
        // no-op okay
    }

    public int getNoOfClasses() {
        // no-op okay but you must
        // return an int value.
        return 0;
    }

    public void setHost(String hostName) {
        // no-op okay
    }
}