/** 
* See more examples here: https://bitbucket.org/snippets/radistao/geerj 
* <p> 
 * Run with: 
 * <pre>javac IteratorInOneScope.java && java IteratorInOneScope</pre> 
 * 
 * and try two cases:<ul> 
 * <li>with the <b>for</b> loop: falls to <i>java.lang.OutOfMemoryError: Java heap space</i></li> 
 * <li>without <b>for</b> loop: completes successfully</li> 
 * </ul> 
 * <p> 
 * <b>Conclusion</b>: <b>for</b> loop created automatically a (temporary) reference to a memory block, 
 * but has not released it after usage before the next memory allocation. 
 */ 
public class IteratorInOneScope { 

    private static final int HALF_OF_MEMORY = (int) (Runtime.getRuntime().maxMemory() * 0.5); 

    public static void main(String[] args) { 
        byte[] data = new byte[HALF_OF_MEMORY]; 

        for (byte b : data); // <-- if you comment this line - the application finished successfully 
        data = null; // this expects to discard reference -> allow to release the memory 

        byte[] data2 = new byte[HALF_OF_MEMORY]; // the memory can't be allocated second time, if the "for" loop statement above is used 

        System.out.println("Success"); 
    } 
}