Java中的 UUID equals() 方法及示例

Java中UUID 类的equals()方法用于检查一个 UUID 与另一个 UUID 是否相等。如果两个 UUID 逐位完全相同，则该方法返回 True。

句法：

public boolean equals(Object uuidObj)

参数：该方法采用一个参数uuidObj ，UUID_1 将与该参数进行比较。

返回值：如果两个 UUID 相同，则该方法返回true ，否则返回false 。

下面的程序说明了 equals() 方法的工作：

方案一：

// Java code to illustrate equals() method
  
import java.util.*;
  
public class UUID_Demo {
    public static void main(String[] args)
    {
  
        // Creating two UUIDs
        UUID UUID_1
            = UUID
                  .fromString(
                      "5fc03087-d265-11e7-b8c6-83e29cd24f4c");
  
        UUID UUID_2
            = UUID
                  .fromString(
                      "5fc03087-d265-11e7-b8c6-83e29cd24f4c");
  
        // Displaying the UUID values
        System.out.println("UUID_1: "
                           + UUID_1.clockSequence());
        System.out.println("UUID_2: "
                           + UUID_2.clockSequence());
  
        // Comparing both the UUIDs
        System.out.println("Are both UUID equal: "
                           + UUID_1.equals(UUID_2));
    }
}

输出：

UUID_1: 14534
UUID_2: 14534
Are both UUID equal: true

方案二：

// Java code to illustrate equals() method
  
import java.util.*;
  
public class UUID_Demo {
    public static void main(String[] args)
    {
  
        // Creating two UUIDs
        UUID UUID_1
            = UUID
                  .fromString(
                      "5fc03087-d265-11e7-b8c6-83e29cd24f4c");
  
        UUID UUID_2
            = UUID
                  .fromString(
                      "58e0a7d7-eebc-11d8-9669-0800200c9a66");
  
        // Displaying the UUID values
        System.out.println("UUID_1: "
                           + UUID_1.clockSequence());
        System.out.println("UUID_2: "
                           + UUID_2.clockSequence());
  
        // Comparing both the UUIDs
        System.out.println("Are both UUID equal: "
                           + UUID_1.equals(UUID_2));
    }
}

输出：

UUID_1: 14534
UUID_2: 5737
Are both UUID equal: false