C++；和Java'；s字符串上的循环性能比较

我已经针对循环对C++（在Visual Studio Community Edition 2015中实现）和Java（1.7）进行了一些性能测试。
以下是源代码：

Java:

long startTime = 0;
long endTime = 0;
long totalTime = 0;

startTime = System.currentTimeMillis();
for (long counter = 0; counter < numberOfIterations; counter++)
{
    System.out.println("01234");
}
endTime = System.currentTimeMillis();
totalTime = endTime - startTime;

ULONGLONG startTime = 0;
ULONGLONG endTime = 0;
ULONGLONG elapsedTime = 0;

startTime = GetTickCount64();
for (LONGLONG counter = 0; counter < numberOfIterations; counter++)
{
    cout << "01234" << endl;
}
endTime = GetTickCount64();
elapsedTime = endTime - startTime;

long startTime = 0;
long endTime = 0;
long totalTime = 0;
startTime = System.currentTimeMillis();
for(long counter = 0; counter < numberOfIterations; counter++) {
    String tempString = new String("test");
}
endTime = System.currentTimeMillis();

ULONGLONG startTime = 0;
ULONGLONG endTime = 0;
ULONGLONG elapsedTime = 0;

startTime = GetTickCount64();
for (LONGLONG counter = 0; counter < numberOfIterations; counter++)
{
    string tempString = "test";
}
endTime = GetTickCount64();
elapsedTime = endTime - startTime;

long startTime=0；
长结束时间=0；
长总时间=0；
startTime=System.currentTimeMillis（）；
for（长计数器=0；计数器

C++（基于Windows，发行版x64，速度优化）：

long startTime = 0;
long endTime = 0;
long totalTime = 0;

startTime = System.currentTimeMillis();
for (long counter = 0; counter < numberOfIterations; counter++)
{
    System.out.println("01234");
}
endTime = System.currentTimeMillis();
totalTime = endTime - startTime;

ULONGLONG startTime = 0;
ULONGLONG endTime = 0;
ULONGLONG elapsedTime = 0;

startTime = GetTickCount64();
for (LONGLONG counter = 0; counter < numberOfIterations; counter++)
{
    cout << "01234" << endl;
}
endTime = GetTickCount64();
elapsedTime = endTime - startTime;

long startTime = 0;
long endTime = 0;
long totalTime = 0;
startTime = System.currentTimeMillis();
for(long counter = 0; counter < numberOfIterations; counter++) {
    String tempString = new String("test");
}
endTime = System.currentTimeMillis();

ULONGLONG startTime = 0;
ULONGLONG endTime = 0;
ULONGLONG elapsedTime = 0;

startTime = GetTickCount64();
for (LONGLONG counter = 0; counter < numberOfIterations; counter++)
{
    string tempString = "test";
}
endTime = GetTickCount64();
elapsedTime = endTime - startTime;

ULONGLONG startTime=0；
ULONGLONG endTime=0；
ULONGLONG elapsedTime=0；
startTime=GetTickCount64（）；
for（LONGLONG counter=0；counter最后，我终于能够按照我的承诺抽出时间在这里发布一个答案。但我对此表示歉意。不管怎样，这是我收集的统计数据。请容忍我，这是一个相当长的答案。顺便说一句，这两个答案都是在Windows 10 Pro x64机器=）上执行的


第一代码（C++和java两种）：
在Windows上的Java中：
public void testForLoopCreateInt(long numberOfIterations) {
    ArrayList<Integer> listOfIntegers = new ArrayList<Integer>();
    long startTime = 0;
    long endTime = 0;
    long totalTime = 0;
    System.out.println("\n===========================" + "\ntestForLoopCreateInt() Looping for: " + numberOfIterations);
    startTime = System.currentTimeMillis();
    for(long counter = 0; counter < numberOfIterations; counter++) {
        int i = 0;
        listOfIntegers.add(i);
    }
    endTime = System.currentTimeMillis();
    totalTime = endTime - startTime;
    System.out.println("Total time: " + totalTime + " milliseconds");

    System.out.println("===========================testForLoopCreateInt()");

    for (int indexer = 0; indexer < 10; indexer++) {
        int y = listOfIntegers.get(indexer);
    }
}

public void testForLoopCreateUniformStringAndStoreToArrayList(long numberOfIterations) {
    ArrayList<String> listOfIntegers = new ArrayList<String>();
    long startTime = 0;
    long endTime = 0;
    long totalTime = 0;
    System.out.println("\n===========================" + "\ntestForLoopCreateUniformStringAndStoreToArrayList() Looping for: " + numberOfIterations);
    startTime = System.currentTimeMillis();
    for(long counter = 0; counter < numberOfIterations; counter++) {
        String string = new String("01234");
        listOfIntegers.add(string);
    }
    endTime = System.currentTimeMillis();
    totalTime = endTime - startTime;
    System.out.println("Total time: " + totalTime + " milliseconds");

    System.out.println("===========================testForLoopCreateUniformStringAndStoreToArrayList()");

    for (int indexer = 0; indexer < 10; indexer++) {
        String y = listOfIntegers.get(indexer);
    }
}

public void testForLoopCreateInt（长迭代次数）{
ArrayList listOfIntegers=新的ArrayList（）；
长起始时间=0；
长结束时间=0；
长总时间=0；
System.out.println（“\n========================================”+“\ntestForLoopCreateInt（）循环：“+numberOfIterations”）；
startTime=System.currentTimeMillis（）；
for（长计数器=0；计数器

C++中的一些Win32 API：

void Loops::testForLoopCreateInt(LONGLONG numberOfIterations)
{
    cout << "\n===========================" << "\ntestForLoopCreateInt() Looping for: " << numberOfIterations << endl;
    vector<int> vectorOfInts;

    high_resolution_clock::time_point startTime = high_resolution_clock::now();
    for (LONGLONG counter = 0; counter < numberOfIterations; counter++)
    {
        int i = 0;
        vectorOfInts.push_back(i);
    }
    high_resolution_clock::time_point endTime = high_resolution_clock::now();

    duration<double, std::milli> totalTime = endTime - startTime;
    cout << "Total time: " << totalTime.count() << " milliseconds" << endl;
    cout << "===========================testForLoopCreateInt()" << endl;

    for (int indexer = 0; indexer < 10; indexer++) {
        int y = vectorOfInts.at(indexer);
    }
}

void Loops::testForLoopCreateUniformStringAndStoreToVector(LONGLONG numberOfIterations)
{
    cout << "\n===========================" << "\ntestForLoopCreateUniformStringAndStoreToVector() Looping for: " << numberOfIterations << endl;
    vector<string> vectorOfStrings;

    high_resolution_clock::time_point startTime = high_resolution_clock::now();
    for (LONGLONG counter = 0; counter < numberOfIterations; counter++)
    {
        string str000("01234");
        vectorOfStrings.push_back(str000);
    }
    high_resolution_clock::time_point endTime = high_resolution_clock::now();

    duration<double, std::milli> totalTime = endTime - startTime;
    cout << "Total time: " << totalTime.count() << " milliseconds" << endl;
    cout << "===========================testForLoopCreateUniformStringAndStoreToVector()" << endl;

    for (int indexer = 0; indexer < 10; indexer++) {
        string y = vectorOfStrings.at(indexer);
    }
}

void循环：：testForLoopCreateInt（LONGLONG numberOfIterations）
{
cout强制性：这里的问题是：您的示例可能太幼稚，无法生成有意义的数字。请参见示例。我的意思是：Java JIT进行了大量优化。它可能很快就会发现，创建被丢弃的字符串对象毫无意义。对于另一个测试用例，您在打印控制台（？）大部分时间都会花在系统调用中？在第一个C++例子中，请在循环之前添加两行：<代码> IOSKBASE:：SycCyWOSSTIDO（false）；< /C> >和<代码> CIN。；
，然后再试一次？将
endl
更改为
'\n'
@PeteBecker:No
endl
是正确的，因为
System.out.println
也会刷新缓冲区。公平地说，两种语言都应该刷新或不刷新。