有人知道为什么我这儿的testModify方法，修改后输出的对应值不是姓名而是一串地址吗？

Answer 1

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Answer 2

看看你的学生类里有没有使用equals()  hashCode()方法

Answer 3

重写toString

Answer 4

Student类中需要重写toString()方法

Answer 5

没有重写toString()方法