Runtime : maxMemory()

package Runtime;

public class maxMemory {
    public static void main(String[] argv)throws Exception{
        long heapSize =Runtime.getRuntime().totalMemory();
        System.out.println("heapSize : "+ heapSize);
       
        long heapMaxSize=Runtime.getRuntime().maxMemory();
        System.out.println("heapMaxSize : "+ heapMaxSize);
       
        long heapFreeSize=Runtime.getRuntime().freeMemory();
        System.out.println("heapFreeSize : "+ heapFreeSize);
    }
}