Advantage of switch over if-else statement

Question

What\'s the best practice for using a switch statement vs using an if statement for 30 unsigned enumerations where about 10 have an ex

Answer 1

I know its old but

public class SwitchTest {
static final int max = 100000;

public static void main(String[] args) {

int counter1 = 0;
long start1 = 0l;
long total1 = 0l;

int counter2 = 0;
long start2 = 0l;
long total2 = 0l;
boolean loop = true;

start1 = System.currentTimeMillis();
while (true) {
  if (counter1 == max) {
    break;
  } else {
    counter1++;
  }
}
total1 = System.currentTimeMillis() - start1;

start2 = System.currentTimeMillis();
while (loop) {
  switch (counter2) {
    case max:
      loop = false;
      break;
    default:
      counter2++;
  }
}
total2 = System.currentTimeMillis() - start2;

System.out.println("While if/else: " + total1 + "ms");
System.out.println("Switch: " + total2 + "ms");
System.out.println("Max Loops: " + max);

System.exit(0);
}
}

Varying the loop count changes a lot:

While if/else: 5ms Switch: 1ms Max Loops: 100000

While if/else: 5ms Switch: 3ms Max Loops: 1000000

While if/else: 5ms Switch: 14ms Max Loops: 10000000

While if/else: 5ms Switch: 149ms Max Loops: 100000000

(add more statements if you want)