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23 年
out.println和system.out.println有什么区别?
System.out. println 与System.err. println 的 区别 (输出顺序) 今天看到别人写的代码中有一行System.err. println 用来输出,以前从没用过,就仔细研究了,总结如下: err是运行期异常和错误反馈的输出流的方向 System.err. println 只能在屏幕上实现打印,即使你重定向了也一样 用err打印出的 ...
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