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is nEvEr ClosED

这个是警告,这个没有关系.你可以把这个变量名改成一个其他的单词就不会有这个提示了.

1、首先你的这个程序是一个 do {} while()循环,而你在该循环里用到了Scanner in =new Scanner(http://System.in)输入流 .要想解决波浪线问题,我们就应该想办法把 Scanner 关闭,也就是用 in.closed();关闭它.2、因为是循环,所以

第一个应该是页面上的吧,意识是input标签没闭合 第二个是定义的局部变量未使用,是个多余的变量!

打印完语句之后,要关闭输入流;input.close();

您好,很高兴为您解答.原因:Scanner in = new Scanner(System.in);之后,没有关闭 最后加一个in.close();即可 如若满意,请点击右侧【采纳答案】,如若还有问题,请点击【追问】 希望我的回答对您有所帮助,望采纳! ~ O(∩_∩)O~

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1. resource leak是资源泄露的意思 2. 一般是你有没有关闭的资源造成的 例如:数据库链接,http链接线程池等

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