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How do you find memory usage from Java program? How much percent of the heap is used?

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You can use memory related methods from java.lang.Runtime class to get the free memory, total memory and maximum heap memory in Java.  By using these methods, you can find out how many percents of the heap is used and how much heap space is remaining. Runtime.freeMemory() return amount of free memory in bytes, Runtime.totalMemory() returns total memory in bytes and Runtime.maxMemory() returns maximum memory in bytes.

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