在 Java 中 ConcurrentSkipListSet 包含()方法
原文:https://www . geeksforgeeks . org/concurrentskiplistset-contains-method-in-Java/
java . util . concurrentskiplistset的 contains() 方法是 Java 中的内置函数，如果该集合中存在指定的元素，则返回真布尔值，否则返回假值。
语法:
ConcurrentSkipListSet.contains(Object o)
参数:该功能接受单个参数 o ，即检查该组中是否存在该参数。
返回值:该函数返回一个布尔值。如果该集合中存在指定的元素，则返回真，否则返回假。
下面的程序说明了 ConcurrentSkipListSet.contains()方法:
程序 1:
// Java Program Demonstrate contains()
// method of ConcurrentSkipListSet
import java.util.concurrent.*;
class ConcurrentSkipListSetContainsExample1 {
public static void main(String[] args)
{
// Initializing the set
ConcurrentSkipListSet<Integer>
set = new ConcurrentSkipListSet<Integer>();
// Adding elements to this set
for (int i = 10; i <= 15; i++)
set.add(i);
// Checks if 9 is present in the set
if (set.contains(9))
System.out.println("9 is present in the set.");
else
System.out.println("9 is not present in the set.");
}
}
输出:
9 is not present in the set.
程序二:
// Java Program Demonstrate contains()
// method of ConcurrentSkipListSet */
import java.util.concurrent.*;
class ConcurrentSkipListSetContainsExample2 {
public static void main(String[] args)
{
// Initializing the set
ConcurrentSkipListSet<String>
set = new ConcurrentSkipListSet<String>();
// Adding elements to this set
set.add("Gfg");
set.add("is");
set.add("fun");
// Checks if Gfg is present in the set
if (set.contains("Gfg"))
System.out.println("Gfg is present in the set.");
else
System.out.println("Gfg is not present in the set.");
}
}
输出:
Gfg is present in the set.
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