package exceptions;

/**

* RUN:

* javac exceptions/CleanupIdiom.java && java exceptions.CleanupIdiom

* OUTPUT:

* NeedsCleanup 1 completed

* NeedsCleanup 3 completed

* NeedsCleanup 2 completed

* NeedsCleanup 5 completed

* NeedsCleanup 4 completed

*/

// import java.util.logging.*;

// import java.io.*;

public class CleanupIdiom {

public static void main(String[] args)

{

// section 1.

NeedsCleanup nc1 = new NeedsCleanup();

try {

// . . .

}

finally {

nc1.dispose();

}

// section 2.

NeedsCleanup nc2 = new NeedsCleanup();

NeedsCleanup nc3 = new NeedsCleanup();

try {

// . . .

}

finally {

nc3.dispose();

nc2.dispose();

}

// section 3.

try {

NeedsCleanup2 nc4 = new NeedsCleanup2();

try {

NeedsCleanup2 nc5 = new NeedsCleanup2();

try {

// . . .

}

finally {

nc5.dispose();

}

}

catch(ConstructionException e) {

System.out.println(e);

}

finally {

nc4.dispose();

}

}

catch(ConstructionException e) {

System.out.println(e);

}

}

}

class NeedsCleanup {

private static long counter = 1;

private final long id = counter++;

public void dispose() {

System.out.println("NeedsCleanup "+ id + " completed");

}

}

class ConstructionException extends Exception {}

class NeedsCleanup2 extends NeedsCleanup {

public NeedsCleanup2() throws ConstructionException {}

}