集合体系概述 Collection是单列集合的祖宗,它规定的方法(功能)是全部单列集合都会继承的
public class Work1 {public static void main(String[] args) {//简单认识一下Collection集合的特点ArrayList<String> list new ArrayList&…
运行roslaunch文件提示:
RLException:Invalid roslaunch XML Syntax: mismatched tag: line 45, column 2 The traceback for the exception was written to the log file.
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解决办法:
line45 行多了标签:</node>
另外…