MemoryConsumer.java

public class MemoryConsumer {

    public static void main(String[] args) {

        long seconds = 30000;
        long start = System.currentTimeMillis();

        Long sillyCounter = 0l;
        while (start + seconds > System.currentTimeMillis())
            sillyCounter++;

        System.out.println("Counter: " + sillyCounter);
    }

}