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import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
public class TestCompilationSpeed {
final static int MAX_ITERATIONS = 10000;
public static void main(String[] args) throws Exception {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
String fact = "function fact (n){if (n == 0)return 1; else return n*fact (n-1);};";
long time = System.currentTimeMillis();
for (int i = 0; i < MAX_ITERATIONS; i++)
engine.eval(fact);
System.out.println(System.currentTimeMillis() - time);
Compilable compilable = null;
if (engine instanceof Compilable) {
compilable = (Compilable) engine;
CompiledScript script = compilable.compile(fact);
time = System.currentTimeMillis();
for (int i = 0; i < MAX_ITERATIONS; i++)
script.eval();
System.out.println(System.currentTimeMillis() - time);
}
}
}
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