Java 中的 ConcurrentSkipListSet equals()方法
原文:https://www . geeksforgeeks . org/concurrentskiplistset-equals-method-in-Java/
java . util . concurrentSkiplistset 的 equals()方法是 Java 中的一个内置函数，它将指定的对象与该集合进行比较以获得相等性。如果指定的对象也是集合，则返回真。如果两个集合满足以下所有条件，则称它们相等:
- These two sets have the same size.
- Each member of the specified collection is contained in this collection.
这个定义确保了 equals 方法可以在 set 接口的不同实现中正常工作。
语法:
ConcurrentSkipListSet.equals(Object o)
参数:该函数返回单个参数 o ，即要与该集合进行相等比较的对象
返回值:函数返回布尔值。如果指定的对象等于该集合，则返回 true，否则返回 false。
下面的程序说明了 ConcurrentSkipListSet.equals()方法:
程序 1: 在本例中，两个集合相等。
// Java Program Demonstrate equals()
// method of ConcurrentSkipListSet
import java.util.NavigableSet;
import java.util.concurrent.ConcurrentSkipListSet;
class ConcurrentSkipListSetEqualsExample1 {
public static void main(String[] args)
{
// Initializing the set
ConcurrentSkipListSet<Integer>
set = new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
set.add(10);
set.add(35);
set.add(20);
set.add(25);
// Creating a descending set object
NavigableSet<Integer> des_set = set.descendingSet();
// Checking if the set and des
if (set.equals(des_set))
System.out.println("Both the sets are equal");
else
System.out.println("Both the sets are not equal");
// Printing the elements of the set
System.out.println("Contents of the set: " + set);
// Printing the elements of the descending set
System.out.println("Contents of the descending set: " +
des_set);
}
}
输出:
Both the sets are equal
Contents of the set: [10, 20, 25, 35]
Contents of the descending set: [35, 25, 20, 10]
程序 2: 在本例中两个集合不相等
// Java Program Demonstrate equals()
// method of ConcurrentSkipListSet
import java.util.NavigableSet;
import java.util.concurrent.ConcurrentSkipListSet;
class ConcurrentSkipListSetEqualsExample2 {
public static void main(String[] args)
{
// Initializing the set
ConcurrentSkipListSet<Integer>
set1 = new ConcurrentSkipListSet<Integer>();
ConcurrentSkipListSet<Integer>
set2 = new ConcurrentSkipListSet<Integer>();
// Adding elements to first set
set1.add(10);
set1.add(35);
set1.add(20);
set1.add(25);
// Adding elements to second set
set2.add(35);
set2.add(20);
set2.add(25);
// Checking if the set and des
if (set1.equals(set2))
System.out.println("Both the sets are equal");
else
System.out.println("Both the sets are not equal");
// Printing the elements of the set
System.out.println("Contents of the first set: " +
set1);
// Printing the elements of the descending set
System.out.println("Contents of the second set: " +
set2);
}
}
输出:
Both the sets are not equal
Contents of the first set: [10, 20, 25, 35]
Contents of the second set: [20, 25, 35]
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