区域偏移比较 Java 中的(区域偏移)方法，示例
原文:https://www . geeksforgeeks . org/zone offset-comparetozone offset-method-in-Java-with-examples/
java.time 包中 ZoneOffset 类的 compareTo(ZoneOffset) 方法用于比较作为参数传递给该 ZoneOffset 实例的 ZoneOffset 的另一个实例。此方法返回一个整数值，即比较器值。
语法:
public int compareTo(ZoneOffset anotherZoneOffset)
参数:该方法接受一个参数另一个区域偏移，该参数将与该区域偏移实例进行比较。
返回值:该方法返回一个整数值，如下所示:
- 如果此实例大于作为参数传递的实例，则返回正值
- 如果此实例等于作为参数传递的实例，则返回零(0)
-
if this instance is less than instance passed as a parameter then a negative value is returned.
异常:如果作为参数传递的另一个区域偏移量为空，此方法将引发空指针异常。
以下示例说明了 ZoneOffset.compareTo()方法:
例 1:
```java // Java code to illustrate compareTo() method
import java.time.*;
public class GFG { public static void main(String[] args) {
// Get the ZoneOffset instance ZoneOffset zoneOffset1 = ZoneOffset.ofHours(5); System.out.println("ZoneOffset 1: " + zoneOffset1);
// Get the ZoneOffset instance ZoneOffset zoneOffset2 = ZoneOffset.ofHours(5); System.out.println("ZoneOffset 2: " + zoneOffset2);
// Get the ZoneOffset instance ZoneOffset zoneOffset3 = ZoneOffset.ofHours(3); System.out.println("ZoneOffset 3: " + zoneOffset3);
// Using compareTo() method System.out.println("ZoneOffset 1 " + "compared to ZoneOffset 2: " + zoneOffset1.compareTo(zoneOffset2));
// Using compareTo() method System.out.println("ZoneOffset 1 " + "compared to ZoneOffset 3: " + zoneOffset1.compareTo(zoneOffset3));
// Using compareTo() method System.out.println("ZoneOffset 3 " + "compared to ZoneOffset 1: " + zoneOffset3.compareTo(zoneOffset1)); } } ```
Output:
```java ZoneOffset 1: +05:00 ZoneOffset 2: +05:00 ZoneOffset 3: +03:00 ZoneOffset 1 compared to ZoneOffset 2: 0 ZoneOffset 1 compared to ZoneOffset 3: -7200 ZoneOffset 3 compared to ZoneOffset 1: 7200
```
示例 2: 显示空指针异常
```java // Java code to illustrate compareTo() method
import java.time.*;
public class GFG { public static void main(String[] args) {
try { // Get the ZoneOffset instance ZoneOffset zoneOffset = ZoneOffset.ofHours(3); System.out.println("ZoneOffset: " + zoneOffset);
// Using compareTo() method System.out.println("ZoneOffset " + "compared to null: ");
zoneOffset.compareTo(null); } catch (Exception e) { System.out.println(e); } } } ```
Output:
```java ZoneOffset: +03:00 ZoneOffset compared to null: java.lang.NullPointerException
```
参考: 甲骨文文档
版权属于：月萌API www.moonapi.com，转载请注明出处
