Monitor memory usage in Java

Use the code to get information of memory usage at runtime.

Runtime runtime = Runtime.getRuntime();long maxMemory = runtime.maxMemory();long allocatedMemory = runtime.totalMemory();long freeMemory = runtime.freeMemory();

Reference: http://stackoverflow.com/questions/74674/how-to-do-i-check-cpu-and-memory-usage-in-java