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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Mar 6, 2000

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Determine Your Heap Size

The following example program prints out both the total and free memory sizes, allocates a chunk of memory, and then prints the memory sizes again. If the initial size of your JVM's heap is about 1 MB, you should see the total memory increase as the heap grows. The amount of free memory should change as a function of the amount of memory allocated and the increase in size of the heap.
 
public final class HeapSize {

  public static final int DATA_SIZE = 1024*1024;

  public static final void printMemory(Runtime runtime) {
    System.out.println("\nTotal Memory: " + runtime.totalMemory());
    System.out.println("Free Memory : " + runtime.freeMemory());
  }

  public static final void main(String[] args) {
    Runtime runtime;
    byte[] data;

    runtime = Runtime.getRuntime();

    printMemory(runtime);

    data = new byte[DATA_SIZE];

    printMemory(runtime);
  }
}

Daniel Savarese
 
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