Java 中的持续时间零字段，示例

原文:https://www . geesforgeks . org/duration-Java 零字段-带示例/

java.time 包中持续时间类的 ZERO 字段用于将该持续时间值设置为零。它类似于 Java 中其他数据类型的空值。

语法:

Duration duration = Duration.ZERO;

以下示例说明了持续时间。零字段:

例 1:

// Java code to illustrate ZERO field

import java.time.Duration;

public class GFG {
    public static void main(String[] args)
    {

        // Duration using parse() field
        Duration duration
            = Duration.parse("P2DT3H4M");

        // Display the duration
        System.out.println(duration);

        // Now set the duration to ZERO
        duration = Duration.ZERO;

        // Display the duration
        System.out.println(duration);
    }
}

Output:

PT51H4M
PT0S

例 2:

// Java code to illustrate ZERO field

import java.time.Duration;

public class GFG {
    public static void main(String[] args)
    {

        // Duration
        Duration duration
            = Duration.ofDays(-5);

        // Display the duration
        System.out.println(duration);

        // Now set the duration to ZERO
        duration = Duration.ZERO;

        // Display the duration
        System.out.println(duration);
    }
}

输出:

PT-120H
PT0S

参考:https://docs . Oracle . com/javase/9/docs/API/Java/time/duration . html # ZERO

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