小编Jie*_*eng的帖子

我在编译时遇到未经检查的表达式错误，发现有问题的行是

ArrayList<Integer> items = (ArrayList<Integer>) this.items.clone();

我正在尝试执行对象的深层复制，因此我以上述方式克隆对象和数组列表的属性。我该如何解决这个警告？

• 我可以使用@SuppressWarnings("unchecked")，但这只是隐藏了问题（尽管我期望没有）
• 如果我通过循环遍历所有元素来手动克隆，我认为它会更慢

这样做的正确方法是什么？

我想知道在 Java 中创建日期的正确方法是什么？这看起来是最简单的方法

new Date(year, month, day, hours, mins) 

已折旧。那么我应该如何创建日期。我知道推荐的方法是使用 long 但有什么简单的方法来获取人类可读日期的长值，例如“2012-03-21 2:00PM”（或类似的东西）？

- 这是一个更新的帖子,删除了旧帖子 -

假设我有类似下面的数据我想在3D图形/表面中绘图matplotlib.我该怎么做？

按照@JouniK.Seppänen的回答,我认为我需要meshgrid(),但我认为我的轴数据不是很正确.如果我有数据(在JSON中),如:

{
    "data": {
        "Random": [
            [1834, 3353, 4602, 5471, 6522, 7873], 
            [2637, 8575, 8357, 10329, 9742, 10359], 
            [3648, 10602, 10667, 10751, 10666, 10552], 
            [4570, 10220, 9202, 10460, 10329, 10928], 
            [5879, 10788, 10832, 10923, 11075, 10989], 
            [6783, 11104, 10235, 10499, 11024, 10731], 
            [7074, 11097, 10222, 10613, 10508, 10767], 
            [7300, 11002, 10727, 11073, 10328, 10864]], 
        "LRU": [
            [123, 155, 201, 223, 296, 321], 
            [143, 590, 1046, 1566, 1924, 2434], 
            [163, 1167, 1774, 2578, …

通常,我可以在脚本标记中包含MathJax,如:

<script src="path-to-MathJax/MathJax.js?config=default"></script>

但是使用RequireJS,我可以包含配置,但配置会发生什么？

处理我的任务,在另一个问题中处理更多细节.如果我使用

arr[(i * 16) % arrLen] *= 2; // seg fault

VS

arr[i % arrLen] *= 2; // OK!

为什么？完整来源见第31行.为什么？我模数组的长度,所以应该没问题？

这条线似乎是正义的

Parser2.Parse("E:\\Dropbox\\Sch\\CS3201\\Assignments\\SIMPLE.txt");

在包含文件中定义

#include "Parser2.cpp"

完整来源

问题出在这里？

当我这样做时,hg status我看到:

[jiewmeng@JM Code]$ hg status
M examples/SampleTestingSolution/EmptyGeneralTesting/Debug/SPA.lib
M examples/SampleTestingSolution/EmptyGeneralTesting/Debug/UnitTesting.exe
M examples/SampleTestingSolution/EmptyGeneralTesting/Debug/UnitTesting.ilk
M examples/SampleTestingSolution/EmptyGeneralTesting/Debug/UnitTesting.pdb
M examples/SampleTestingSolution/EmptyGeneralTesting/EmptyGeneralTesting.suo
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/AST.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/CL.read.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/CL.write.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/DesignExtractor.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/Lib-link.read.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/Lib-link.write.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/Node.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/PKB.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/Parser.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/Query Evaluator.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/Query Processor.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/SPA.Build.CppClean.log
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/SPA.lastbuildstate
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/SPA.log
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/VarTable.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/cl.command.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/lib.command.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/vc100.idb
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/Debug/vc100.pdb
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/SPA.vcxproj
M examples/SampleTestingSolution/EmptyGeneralTesting/SPA/SPA.vcxproj.filters
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/CL.read.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/CL.write.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/NodeTest.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/UnitTest.obj
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/UnitTesting.lastbuildstate
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/UnitTesting.log
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/cl.command.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/link.command.1.tlog
M examples/SampleTestingSolution/EmptyGeneralTesting/UnitTesting/Debug/link.read.1.tlog …

是否存在确定性算法来检查图形是否包含从源到目的地的顶点不相交路径,具有复杂性O(nm^2)(n是顶点数,m是边数)或者是NP-Hard(如果是,为什么)？顶点不相交路径表示没有共同内部顶点的路径.例如.

s -> a -> b -> c -> d  
s -> x -> y -> z -> d

顶点不相交但是

s -> a -> b -> c -> d
s -> x -> a -> z -> d
          ^

不是因为a是常见的顶点.

完整的问题是:

当我有一个类似的字符串\n\n\n,然后我分手时\\n,我明白了0.为什么是这样？

public class Test {

     public static void main(String []args){
        String str = "\n\n\n";
        String[] lines = str.split("\\n");
        System.out.println(lines.length);
     }
}

您可以将代码复制并粘贴到CompileOnline中.

我可以使用node-inspector来调试我的nodemon应用程序.但我想调试我的测试.所以我了解到我需要在调试模式启动mocha(mocha --debug)问题是,这将尝试在端口5858上默认调试,在我的情况下nodemon正在使用.所以我需要更改其中一个的调试端口,我该怎么做？