java判断class java判断class子类或父类的实例方法

Class c = ArrayList.class;

c.isPrimitive(); //判断c是否为基本数据类型

c.isAssignableFrom(List.class); //判断c是否是List类的子类或父类

c.getGenericType(); //得到泛型类型

package com.zf.target;

 

import java.lang.reflect.Field;

import java.lang.reflect.ParameterizedType;

import java.lang.reflect.Type;

import java.util.List;

import java.util.Map;

 

class T{

  List<A> a;

  List<B> b;

//  List l ;

  Map<Integer, String> map ;

  int c;

}

 

class A {}

class B{}

 

public class Test9{

 

  public static void main(String[] args) {

    Class tc = T.class;

    Field[] fields = tc.getDeclaredFields();

    for (Field f : fields) {

      Class fc = f.getType();

      if(fc.isPrimitive()){

        System.out.println("基本数据类型： " + f.getName() + " " + fc.getName());

      }else{

        if(fc.isAssignableFrom(List.class)){ //判断是否为List

          System.out.println("List类型：" + f.getName());

          Type gt = f.getGenericType();  //得到泛型类型

          ParameterizedType pt = (ParameterizedType)gt;

          Class lll = (Class)pt.getActualTypeArguments()[0];

          System.out.println("\t\t" + lll.getName());

        }

      }

    }

  }

   

}

Class clazzB = B.class; 
Class clazzD = D.class; 
boolean isFather = clazzD.isAssignableFrom(clazzB)); 
if(isFather){ 
 System.out.println("D是B的父类"); 
}else{ 
 System.out.println("D不是B的父类"); 
}