Java反射

package com;

interface Food {}

public class Fruit implements Food {
private int weight;
String name;
protected int size;
public String color;
private void grow() {}
public static void main(String[] args){
Fruit f = new Fruit();
System.out.println(f.getClass());//class com.Fruit
System.out.println(f.getClass().isEnum());//false
System.out.println(f.getClass().isInterface());//false
System.out.println(f.getClass().isLocalClass());//false
System.out.println(f.getClass().isMemberClass());//false
System.out.println(f.getClass().isPrimitive());//false
System.out.println(f.getClass().getName());//com.Fruit
System.out.println(f.getClass().getSimpleName());//Fruit
System.out.println(f.getClass().getPackage());//package com
System.out.println(f.getClass().getSuperclass());//class java.lang.Object
System.out.println(f.getClass().getGenericSuperclass());//class java.lang.Object
System.out.println(f.getClass().getInterfaces());//interface com.Food[获得接口数组]
System.out.println(f.getClass().getGenericInterfaces());//interface com.Food[获得以Type的形式的接口数组]
System.out.println(f.getClass().getConstructors());//public com.Fruit()[获得构造器List,包括默认构造器]
System.out.println(f.getClass().getFields());//public java.lang.String com.Fruit.color[获取公开属性数组]
System.out.println(f.getClass().getDeclaredFields());//[和getFields()类似,但会获得包括私有属性在内的所有属性]
System.out.println(f.getClass().getDeclaredMethods());//public static void com.Fruit.main(java.lang.String[]);private void com.Fruit.grow()[获得方法数组]
System.out.println(f.getClass().getCanonicalName());//com.Fruit
System.out.println(f.getClass().getComponentType());//null
}
}