java中的Duration是一个用于测量以秒和纳秒为单位的时间的类。 java中duration类的包是java.time.Duration。 Duration 类对象指定时间段或用于确定两个时间之间的差异。 Duration 对象是不可变的并且是线程安全的，因为 Duration 对象是不可变的，因此一旦创建它，我们就无法更改它的值。但是，我们可以基于另一个 Duration 对象创建新的 Duration 对象。 Duration 类继承了一个对象类（因为对象是 java 中所有类的超类）并实现了 Comparable 接口。
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语法
java中Duration类声明的语法是：
public final class Duration extends Object implements Comparable < Duration >,
TemporalAmount, Serializable
{
//
variables and method of the class Duration}Duration 类方法列表在下面通过示例代码进行了解释；示例代码可以进一步用于类似的方法（对于未给出的每个方法示例代码）：
我们通过下面的示例java代码来理解上述方法。
代码：
package p1;
import java.time.Duration;
import java.time.LocalTime;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.between(LocalTime.MAX,LocalTime.MIN);
System.out.println(d.get(ChronoUnit.SECONDS));
Duration absd = d.abs();
System.out.println(absd.get(ChronoUnit.SECONDS));
}
}输出：
我们通过下面的示例java代码来理解上述方法：
代码：
package p1;
import java.time.Duration;
import java.time.*;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.between(LocalTime.MAX,LocalTime.MIN);
LocalDateTime date = LocalDateTime.now();
System.out.println(date);
date = (LocalDateTime)d.addTo(date);
System.out.println(date);
Duration d1 = d.dividedBy(4);
System.out.println(d1);
System.out.println(d.getSeconds());
System.out.println(d1.getSeconds());
}
}输出：
我们通过下面的示例java代码来理解上述方法：
代码：
package p1;
import java.time.Duration;
import java.time.*;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.between(LocalTime.NOON,LocalTime.MAX);
Duration d1 = Duration.between(LocalTime.NOON,LocalTime.MIN);
System.out.println(d1.getSeconds());
System.out.println(d.compareTo(d1));
System.out.println(d1.compareTo(d1));
System.out.println(d1.compareTo(d));
System.out.println(d1.equals(d));
System.out.println(d1.isNegative());
System.out.println(d1.isZero());
}
}输出：
我们通过下面的示例java代码来理解上述方法：
代码：
package p1;
import java.time.Duration;
import java.time.*;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.from(ChronoUnit.DAYS.getDuration());
System.out.println(d.toMinutes());
}
}输出：
我们通过下面的示例java代码来理解上述方法：
代码：
package p1;
import java.time.Duration;
import java.time.*;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.between(LocalTime.NOON,LocalTime.MAX);
System.out.println(d.getUnits());
System.out.println(d.toMinutes());
System.out.println(d.getSeconds());
System.out.println(d.getNano());
System.out.println(d.getClass());
}
}输出：
We understand the above methods with the below sample java code:
Code:
package p1;
import java.time.Duration;
import java.time.*;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.ofDays(6);
System.out.println(d.getSeconds());
Duration d1 = d.minusDays(3);
System.out.println(d1.getSeconds());
d = Duration.ofHours(6);
System.out.println(d.getSeconds());
d1 = d.minusHours(2);
System.out.println(d1.getSeconds());
}
}Output:
We understand the above methods with the below sample java code:
Code:
package p1;
import java.time.Duration;
import java.time.*;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.ofDays(6);
System.out.println(d.getSeconds());
Duration d1 = d.plusDays(2);
System.out.println(d1.getSeconds());
d = Duration.ofHours(6);
System.out.println(d.getSeconds());
d1 = d.plusHours(2);
System.out.println(d1.getSeconds());
}
}Output:
We understand the above methods with the below sample java code:
Code:
package p1;
import java.time.Duration;
import java.time.*;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.ofDays(6);
System.out.println(d.toHours());
Duration d1 =Duration.ofHours(24) ;
System.out.println(d1.toDays());
}
}Output:
We understand the above methods with the below sample java code:
Code:
package p1;
import java.time.Duration;
import java.time.*;
import java.time.temporal.ChronoUnit;
public class DurationClassDemo {
public static void main(String[] args) {
Duration d = Duration.ofDays(6);
System.out.println(d.toString());
d = d.withSeconds(3000);
System.out.println(d.toString());
}
}Output:
The Duration class is one of the built-in class in java, which is used to measure time in seconds and nanoseconds and add, subtract, and convert the duration, or, in simple words, the duration class allows performance operation on time or day duration. The duration class is available in java.time.Duration package of java.
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