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  • Java中isAssignableFrom的用法

     class1.isAssignableFrom(class2) 判定此 Class 对象所表示的类或接口与指定的 Class 参数所表示的类或接口是否相同,或是否是其超类或超接口。如果是则返回 true;否则返回 false。如果该 Class表示一个基本类型,且指定的 Class 参数正是该 Class 对象,则该方法返回 true;否则返回 false。 

    1.class2是不是class1的子类或者子接口

    2.Object是所有类的父类

    一个例子搞定:

    复制代码
    package com.auuzee.test1;
    
    class A {
    }
    
    class B extends A {
    }
    
    public class Test1 {
        public static void main(String[] args) {
    
            A a = new A();
            B b = new B();
            A ba = new B();
            System.out.println("1-------------");
            System.out.println(A.class.isAssignableFrom(a.getClass()));
            System.out.println(B.class.isAssignableFrom(b.getClass()));
            System.out.println(A.class.isAssignableFrom(b.getClass()));
            System.out.println(B.class.isAssignableFrom(a.getClass()));
            System.out.println(A.class.isAssignableFrom(ba.getClass()));
            System.out.println(B.class.isAssignableFrom(ba.getClass()));
            System.out.println("2-------------");
            System.out.println(a.getClass().isAssignableFrom(A.class));
            System.out.println(b.getClass().isAssignableFrom(B.class));
            System.out.println(a.getClass().isAssignableFrom(B.class));
            System.out.println(b.getClass().isAssignableFrom(A.class));
            System.out.println(ba.getClass().isAssignableFrom(A.class));
            System.out.println(ba.getClass().isAssignableFrom(B.class));
            System.out.println("3-------------");
            System.out.println(Object.class.isAssignableFrom(b.getClass()));
            System.out.println(Object.class.isAssignableFrom("abc".getClass()));
            System.out.println("4-------------");
            System.out.println("a".getClass().isAssignableFrom(Object.class));
            System.out.println("abc".getClass().isAssignableFrom(Object.class));
        }
    }
    复制代码

     参考链接:https://www.cnblogs.com/greatfish/p/6097507.html

     
     
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  • 原文地址:https://www.cnblogs.com/xiohao/p/9006220.html
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