check tomcat heap size

import java.lang.management.*;

public static String heapMemoryUsage() {
    long consumedmemory = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getUsed();
    long totalmemory = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getMax();
    return ""+used+" of "+totalmemory +" ("+ consumedmemory /(double)max*100.0 + "%)";
}