CopyOnWriteArraySet的contains(E e)方法检查Set中是否存在给定元素。
用法:
public boolean contains(Object o)
参数:该函数接受单个强制参数,该参数指定要在Set中检查其外观的元素。
返回值:如果该元素存在,则该函数返回true,否则返回false。
以下示例程序旨在说明上述函数:
示例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
示例2:
// 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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注:本文由纯净天空筛选整理自gopaldave大神的英文原创作品 CopyOnWriteArraySet contains() method in Java。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。