Neither. it uses the lookupswitch
JVM instruction, which is essentially a table lookup. Take a look at the bytecode of the following example:
public static void main(String... args) {
switch (1) {
case 1:
break;
case 2:
break;
}
}
public static void main(java.lang.String[]);
Code:
Stack=1, Locals=1, Args_size=1
0: iconst_1
1: lookupswitch{ //2
1: 28;
2: 31;
default: 31 }
28: goto 31
31: return