LinkedHashSet 在 Java 中包含()方法
原文:https://www . geeksforgeeks . org/link edhashset-contains-method-in-Java/
Java . util . LinkedHashSet . contains()方法用于检查特定元素是否存在于 LinkedHashSet 中。所以它基本上是用来检查一个集合是否包含任何特定的元素。
语法:
Hash_Set.contains(Object element)
参数:参数元素属于链接哈希集类型。这是需要测试的元素,无论它是否存在于集合中。
返回值:如果元素存在于集合中,方法返回真,否则返回假。
下面的程序说明了 Java . util . linkedhashset . contains()方法:
// Java code to illustrate LinkedHashSet.contains() method
import java.io.*;
import java.util.LinkedHashSet;
public class LinkedHashSetDemo {
public static void main(String args[])
{
// Creating an empty LinkedHashSet
LinkedHashSet<String> set = new LinkedHashSet<String>();
// Using add() method to add elements into the Set
set.add("Welcome");
set.add("To");
set.add("Geeks");
set.add("4");
set.add("Geeks");
// Displaying the LinkedHashSet
System.out.println("LinkedHashSet: " + set);
// Check for "Geeks" in the set
System.out.println("Does the Set contains 'Geeks'? " + set.contains("Geeks"));
// Check for "4" in the set
System.out.println("Does the Set contains '4'? " + set.contains("4"));
// Check if the Set contains "No"
System.out.println("Does the Set contains 'No'? " + set.contains("No"));
}
}
输出:
LinkedHashSet: [Welcome, To, Geeks, 4]
Does the Set contains 'Geeks'? true
Does the Set contains '4'? true
Does the Set contains 'No'? false
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