java-接口优于抽象类

                   接口优于抽象类（一）

1接口能够继承多个接口,一个类能够实现多个接口。

demo：

singer.java

public interface Singer {

public String work();

}

Transaction.java

public interface TransactinAction {

public String actionMethod();

}

SongWriter.java

public interface SongWriter extends Singer,TransactinAction {

    public String write();

}

WriterImpl.java

public class WriterImpl implements SongWriter {

@Override

        public String work() {

return null;

}

@Override

public String actionMethod() {

return null;

}

@Override

public String write() {

return null;

}

}或者

public class WriterImpl implements TransactinAction,Singer{

@Override

public String work() {

// TODO Auto-generated method stub

return null;

}

@Override

public String actionMethod() {

// TODO Auto-generated method stub

return null;

}

}

抽象类只能被继承。