Posted By:
Noah_Nordrum
Posted On:
Monday, August 6, 2001 11:28 AM
Consider the following test class:
public class LoopTest {
public static final int LOOP_LENGTH = 100000000;
public static long insideLoop() {
long startTime = System.currentTimeMillis();
for (int i = 0; i < LOOP_LENGTH; i++) {
int a = i;
Integer b = new Integer(i);
}
return System.currentTimeMillis() - startTime;
}
public static long outsideLoop() {
long startTime = System.currentTimeMillis();
int a;
Integer b = null;
for (int i = 0; i < LOOP_LENGTH; i++) {
a = i;
b = new Integer(i);
}
return System.currentTimeMillis() - startTime;
}
public static void main(String args[]) {
System.out.println("Inside loop: " + insideLoop() + "ms.");
System.out.println("Outside loop: " + outsideLoop() + "ms.");
}
}
results in:
Inside loop: 19368ms.
Outside loop: 22983ms.
I'd say it matters ;)
Noah
