原文链接

public static void main(String[] args){

    Class string=java.lang.String.class;
    Class object=java.lang.Object.class;

    System.out.println("Object是String父类："+object.isAssignableFrom(string));
    System.out.println("Object与Object相同："+object.isAssignableFrom(object));
    System.out.println("String是Object父类："+string.isAssignableFrom(object));

}
// 结果 
Object是String父类：true
Object与Object相同：true
String是Object父类：false