java short,integer,long performance

Question

I read that JVM stores internally short, integer and long as 4 bytes. I read it from an article from the year 2000, so I don\'t know how true it is now.

For the newe

Answer 1

I agree with user2391480, calculations with shorts seem to be way more expensive. Here is an example, where on my machine (Java7 64bit, Intel i7-3770, Windows 7) operations with shorts are around ~50 times slower than integers and longs.

public class ShortTest {

public static void main(String[] args){
    calculate();
    calculate();
}

public static void calculate(){
    int N = 100000000;

    long time1=System.currentTimeMillis();
    short s=0;
    for(int i = 0; i

}

Output:

Time elapsed for shorts: 113
Time elapsed for ints: 2
Time elapsed for longs: 2
0
Time elapsed for shorts: 119
Time elapsed for ints: 2
Time elapsed for longs: 2
0

Note: specifying "1" to be a short (in order to avoid casting every time, as suggested by user Robotnik as a source of delay) does not seem to help, e.g.

    short s=0;
    short one = (short)1;
    for(int i = 0; i

EDIT: modified as per request of user Hot Licks in the comment, in order to invoke the calculate() method more than once outside the main method.