Java Utililty Methods Memory Usage

List of utility methods to do Memory Usage

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Description

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

Method

longgetMemoryUsage()
get Memory Usage 
Runtime runtime = Runtime.getRuntime();
long memoryInUse = runtime.totalMemory();
return memoryInUse;
doublegetMemoryUsage()
get Memory Usage 
long usedMemory = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
return (double) usedMemory / (double) MEGABYTE_SIZE;
StringgetMemoryUsageSimpleHr()
get Memory Usage Simple Hr 
return getHumanReadableByteCount(getMemoryUsed()) + " / " + getHumanReadableByteCount(getMemoryMax());
StringgetMemoryUsageUnix()
get Memory Usage Unix 
return "Not supported yet.";
StringgetMemoryUtiliztaion()
get Memory Utiliztaion 
Runtime runtime = Runtime.getRuntime();
return "heap=" + df.format(runtime.totalMemory()) + " max=" + df.format(runtime.maxMemory()) + " used="
        + df.format(runtime.totalMemory() - runtime.freeMemory()) + " free="
        + df.format(runtime.freeMemory());
StringgetMemUsage()
get Mem Usage 
if (mbean == null) {
    mbean = ManagementFactory.getMemoryMXBean();
long used = mbean.getHeapMemoryUsage().getUsed();
long max = mbean.getHeapMemoryUsage().getMax();
NumberFormat f = DecimalFormat.getInstance();
f.setMaximumFractionDigits(2);
f.setMinimumFractionDigits(2);
...
doublegetPercentMemoryUsage()
get Percent Memory Usage 
return ((double) getMemoryUsage() / (double) getMaxMemory() * 100);
intgetStringMemoryUsage(String s)
Calculates the memory used by a string's data (not including the String object itself). 
return s.length() * 2;
longgetUsageMemory()
get Usage Memory 
return getAllocatedMemory() - getFreeMemory();
StringmemoryUsage()
memory Usage 
Runtime r = Runtime.getRuntime();
long used = r.totalMemory() - r.freeMemory();
return "usedHeap=" + (used / 1000000) + "MB, percent=" + (100.0 * used / r.maxMemory());