Java - Current Timestamp

Created by : Mr Dk.

2019 / 01 / 06 18:07

Nanjing, Jiangsu, China

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About

在 Java 中获取当前时间戳的几种方式。

1. java.lang.System

long timestamp = System.currentTimeMillis();

2. java.util.Date

long timestamp = new Date().getTime();

它的源代码：

/**
 * Allocates a <code>Date</code> object and initializes it so that
 * it represents the time at which it was allocated, measured to the
 * nearest millisecond.
 *
 * @see     java.lang.System#currentTimeMillis()
 */
public Date() {
    this(System.currentTimeMillis());
}

好像还不如使用第一种方式？

3. java.util.Calendar

long timestamp = Calendar.getInstance().getTimeInMillis();

效率最低，没有必要。

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