Test Closer behavior with Java 6 and 7.

CloserTest.java

import java.io.Closeable;
import java.io.IOException;

import com.google.common.io.Closer;

public class CloserTest {
    private static void testCloserJava6() throws Exception {
        Closer closer = Closer.create();
        try {
            Closeable closeable = closer.register(
                    new ThrowIOExceptionOnClose());
            throw new Exception("from body");
        } catch (Throwable t) {
            throw closer.rethrow(t);
        } finally {
            closer.close();
        }
    }

    private static void testCloserJava7() throws Exception {
        // comment for Java 6
        try (Closer closer = Closer.create()) {
            closer.register(new ThrowIOExceptionOnClose());
            throw new Exception("from body");
        }   
    }           
    
    public static void main(String[] args) throws Exception {
        if (args.length == 1) {
            if (args[0].equals("java6")) {
                testCloserJava6();
            } else if (args[0].equals("java7")) {
                testCloserJava7();
            }
        }
    }
}