copy onwriterarrayset 在 Java 中包含()方法
原文:https://www . geeksforgeeks . org/copy onwriterarrayset-contains-method-in-Java/
包含的方法检查给定元素是否存在于集合中。
语法:
public boolean contains(Object o)
参数:该功能接受单个强制参数 o ，该参数指定要在集合中检查外观的元素。
返回值:函数返回真如果元素存在，则返回假。
以下程序说明了上述功能:
程序 1:
// Java Program to illustrate the CopyOnWriteArraySet
// contains() method in Java
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArraySet
CopyOnWriteArraySet<Integer> ArrSet
= new CopyOnWriteArraySet<Integer>();
// Add elements
ArrSet.add(32);
ArrSet.add(67);
ArrSet.add(67);
ArrSet.add(100);
// print CopyOnWriteArraySet
System.out.println("CopyOnWriteArraySet: "
+ ArrSet);
// check if 100 is present
// using contains() function
if (ArrSet.contains(100))
System.out.println("100 is "
+ "present in the Set");
else
System.out.println("100 is "
+ "not present in the Set");
// check if 20 is present
// using contains() function
if (ArrSet.contains(20))
System.out.println("20 is "
+ "present in the Set");
else
System.out.println("20 is "
+ "not present in the Set");
}
}
输出:
CopyOnWriteArraySet: [32, 67, 100]
100 is present in the Set
20 is not present in the Set
程序二:
// Java Program to illustrate the CopyOnWriteArraySet
// contains() method in Java
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArraySet
CopyOnWriteArraySet<String> ArrSet
= new CopyOnWriteArraySet<String>();
// Add elements
ArrSet.add("geeks");
ArrSet.add("gfg");
ArrSet.add("jgec");
ArrSet.add("sudo");
// print CopyOnWriteArraySet
System.out.println("CopyOnWriteArraySet: "
+ ArrSet);
// check using contains() function
if (ArrSet.contains("gfg"))
System.out.println("gfg is "
+ "present in the Set");
else
System.out.println("gfg is "
+ "not present in the Set");
// check using contains() function
if (ArrSet.contains("best"))
System.out.println("best is "
+ "present in the Set");
else
System.out.println("best is "
+ "not present in the Set");
}
}
输出:
CopyOnWriteArraySet: [geeks, gfg, jgec, sudo]
gfg is present in the Set
best is not present in the Set
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