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| package com.redisc;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
class Person {
public String getName() {
return name;
}
public String getName2() {
return name2;
}
public void setName(String name) {
this.name = name;
}
public String name;
private String name2;
public Person(String name) {
this.name = name;
}
public Person() {
}
}
public class Test {
public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
Person person = new Person();
long statrTime = System.currentTimeMillis();
for (int i = 0; i < 1000000000; i++) {
person.getName();
}
long endTime = System.currentTimeMillis();
System.out.println(endTime - statrTime);
Person person2 = new Person();
Class c1 = person2.getClass();
Method getName = c1.getDeclaredMethod("getName", null);
long statrTime2 = System.currentTimeMillis();
for (int i = 0; i < 1000000000; i++) {
getName.invoke(person2, null);
}
long endTime2 = System.currentTimeMillis();
System.out.println(endTime2 - statrTime2);
Person person3 = new Person();
Class c3 = person3.getClass();
Method getName3 = c3.getDeclaredMethod("getName", null);
getName3.setAccessible(true);
long statrTime3 = System.currentTimeMillis();
for (int i = 0; i < 1000000000; i++) {
getName3.invoke(person3, null);
}
long endTime3 = System.currentTimeMillis();
System.out.println(endTime3 - statrTime3);
}
}
|
