LoverJuan的博客

Shape.java package example1; public interface Shape { public void draw(); public void erase(); } Circle.java package example1; public class Circle implements Shape { @Override public void...

Log.java package example2; public interface Log { public void writeLog(); } FileLog.java package example2; public class FileLog implements Log { @Override public void writeLog() { System....

Connection.java package example3; public interface Connection { public void connect(); } OracleConnection.java package example3; public class OracleConnection implements Connection { @Overri...