Java Utililty Methods Memory Used

List of utility methods to do Memory Used

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Description

The list of methods to do Memory Used are organized into topic(s).

Method

longcalcUsedMemorySize()
calculate used memory size. 
return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
voiddisposeUnusedMemory()
Freeing memory that is available for the application by running the garbage collector. 
Runtime.getRuntime().gc();
longgetAvailableUnusedMemory()
Find out how much unused memory (in bytes) is still available for the JVM to use. 
Runtime r = Runtime.getRuntime();
return r.maxMemory() 
        - r.totalMemory() 
        + r.freeMemory();
intgetMemoryInUse()
Returns the number of megabytes (MB) of memory in use. 
Runtime runtime = Runtime.getRuntime();
long mb = 1024 * 1024;
long total = runtime.totalMemory();
long free = runtime.freeMemory();
return (int) ((total - free) / mb);
longgetMemoryUse()
retrieve the usage of memory. 
putOutTheGarbage();
long totalMemory = Runtime.getRuntime().totalMemory();
putOutTheGarbage();
long freeMemory = Runtime.getRuntime().freeMemory();
return (totalMemory - freeMemory);
longgetMemoryUsed()
get Memory Used 
return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
intgetMemoryUsed()
get Memory Used 
int mb = 1024 * 1024;
Runtime runtime = Runtime.getRuntime();
int memoryUsed = (int) ((runtime.totalMemory() - runtime.freeMemory()) / mb);
return memoryUsed;
intgetMemoryUsed()
Get the used memory in KB. 
collectGarbage();
Runtime rt = Runtime.getRuntime();
long mem = rt.totalMemory() - rt.freeMemory();
return (int) (mem >> 10);
longgetMemoryUsedBytes()
get Memory Used Bytes 
final Runtime runtime = Runtime.getRuntime();
return runtime.totalMemory() - runtime.freeMemory();
StringgetMemoryUsege()
get Memory Usege 
return String.format("memory={total: %d MB, free: %d MB, used: %d MB, max: %d MB}",
        (Runtime.getRuntime().totalMemory() / 1000 / 1000),
        (Runtime.getRuntime().freeMemory() / 1000 / 1000),
        ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1000 / 1000),
        (Runtime.getRuntime().maxMemory() / 1000 / 1000));