memory

public class TestMain {

public static void main(String[] args) {

System.out.println("START");

System.out.println("----------------------------------------------");

/*

totalMemory

Returns the total amount of memory in the Java virtual machine.

maxMemory

Returns the maximum amount of memory that the Java virtual machine will attempt to use.

freeMemory

Returns the amount of free memory in the Java Virtual Machine.

*/

Runtime r = Runtime.getRuntime();

printSize("totalMemory", r.totalMemory());

printSize("maxMemory", r.maxMemory());

printSize("freeMemory", r.freeMemory());

System.out.println("----------------------------------------------");

System.out.println("END");

}

private static void printSize(String memType, long bytes) {

String TAB = "\t";

System.out.print(memType);

System.out.print(TAB + bytes);

System.out.print(TAB + getKB(bytes));

System.out.print(TAB + getMB(bytes));

System.out.println();

}

private static String getKB(long bytes) {

String r = (bytes / 1024) + " KB";

return r;

}

private static String getMB(long bytes) {

String r = (bytes / 1024 / 1024) + " MB";

return r;

}

}

// output

START ---------------------------------------------- totalMemory 10682368 10432 KB 10 MB maxMemory 18677760 18240 KB 17 MB freeMemory 10406024 10162 KB 9 MB ---------------------------------------------- END