Harry Preston

Got it, thanks help

From JDK, ServerSocket.java

/** * The factory for all server sockets. */ private static SocketImplFactory factory = null;

SocketImplFactory.java

public interface SocketImplFactory { /** * Creates a new <code>SocketImpl</code> instance. * * @return a new instance of <code>SocketImpl</code>. * @see java.net.SocketImpl */ SocketImpl createSocketImpl(); }

Question
How can you create instance (factory) of interface (SocketImplFactory)?
"= null" wat mean?

Got it, thanks much

From JDK, Closeable.java
package java.io; import java.io.IOException; /** * A {@code Closeable} is a source or destination of data that can be closed. * The close method is invoked to release resources that the object is * holding (such as open files). * * @since 1.5 */ public interface Closeable extends AutoCloseable { /** * Closes this stream and releases any system resources associated * with it. If the stream is already closed then invoking this * method has no effect. * * @throws IOException if an I/O error occurs */ public void close() throws IOException; }
But AutoCloseable is located java.lang

Question
How does Closeable know where to find AutoCloseable?

Thanks! You helped me solve
But actually my desired directory hierarchy is unchanged
How I fixed issue is change yeaimmad.java package name

package ocjp2.mad;
instead of
package mad;

Thanks much
I try

C:\>javac ocjp2\mad\yeaimmad.java C:\>java -cp C:\ ocjp2.mad.yeaimmad Exception in thread "main" java.lang.NoClassDefFoundError: ocjp2/mad/yeaimmad (w rong name: mad/yeaimmad) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source) C:\>

Wat do?

Layout
C:\ocjp2 --u.class --u.java --mad\ ----yeaimmad.java

Code
//u.java package ocjp2; public class u { public void slambam() { System.out.println("slammitson"); } }

//yeaimmad.java package mad; import ocjp2.*; class yeaimmad { public static void main (String[] args) { System.out.println("sonofagun"); u bebop=new u(); bebop.slambam(); } }

Action
C:\ocjp2>javac -cp C:\ocjp2 mad\yeaimmad.java mad\yeaimmad.java:3: error: package ocjp2 does not exist import ocjp2.*; ^ mad\yeaimmad.java:8: error: cannot find symbol u bebop=new u(); ^ symbol: class u location: class yeaimmad mad\yeaimmad.java:8: error: cannot find symbol u bebop=new u(); ^ symbol: class u location: class yeaimmad 3 errors C:\ocjp2>

Q
Want to compile and run yeaimmad.java...wat do?

Got it, thanks much

My prog
class abstractclass { public static void main(String[] args) { System.out.println("Hello, World"); argul tiffany = new argul(); tiffany.titular(); } } abstract class rap { abstract void titular(); } abstract class genitak extends rap { void titular() { System.out.println("BARBOSA"); }; } class argul extends genitak { void titular() { System.out.println("FIDDYCENT"); }; }

Output
Hello, World
FIDDYCENT

Ques
How to get prog to printout "BARBOSA"?