Java 计算运行时间

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public class Main {

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  public static void main(String[] args) throws Exception {

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    // Get current time

    /**

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    **/

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    long start = System.currentTimeMillis();

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    System.out.println(start);

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    // Do something ...

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    // Get elapsed time in milliseconds

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    long elapsedTimeMillis = System.currentTimeMillis() - start;

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    // Get elapsed time in seconds

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    float elapsedTimeSec = elapsedTimeMillis / 1000F;

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    // Get elapsed time in minutes

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    float elapsedTimeMin = elapsedTimeMillis / (60 * 1000F);

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    // Get elapsed time in hours

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