Java AbstractSequentialList的contains()方法用于检查Collection中是否存在元素。它使用元素作为参数,如果元素存在于集合中,则返回True。
用法:
public boolean contains(Object element)
参数:参数element 的类型为Collection。此参数表示需要在集合中检查其出现的元素。
返回值:该方法返回一个布尔值。如果元素存在于Collection中,则返回True,否则返回False。
以下示例程序旨在说明AbstractSequentialList.contains()方法:
程序1:
// Java code to illustrate
// AbstractSequentialList.contains()
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating an empty Collection
AbstractSequentialList<String>
abs = new LinkedList<String>();
// Use add() method to add
// elements in the collection
abs.add("Geeks");
abs.add("for");
abs.add("Geeks");
abs.add("10");
abs.add("20");
// Displaying the collection
System.out.println("AbstractSequentialList:"
+ abs);
// Check if the collection contains "Hello"
System.out.println("\nDoes the Collection"
+ " contains 'Hello':"
+ abs.contains("Hello"));
// Check if the Collection contains "20"
System.out.println("Does the collection"
+ " contains '20':"
+ abs.contains("20"));
// Check if the Collection contains "Geeks"
System.out.println("Does the Collection"
+ " contains 'Geeks':"
+ abs.contains("Geeks"));
}
}
输出:
AbstractSequentialList:[Geeks, for, Geeks, 10, 20] Does the Collection contains 'Hello':false Does the collection contains '20':true Does the Collection contains 'Geeks':true
程序2:
// Java code to illustrate
// AbstractSequentialList.contains()
import java.util.*;
public class GFG {
public static void main(String args[])
{
// Creating an empty Collection
AbstractSequentialList<Integer>
abs = new LinkedList<Integer>();
// Use add() method to add
// elements in the collection
abs.add(10);
abs.add(20);
abs.add(30);
abs.add(40);
abs.add(50);
// Displaying the collection
System.out.println("AbstractSequentialList:"
+ abs);
// Check if the collection contains 10
System.out.println("\nDoes the Collection "
+ "contains '10':"
+ abs.contains(10));
// Check if the collection contains 50
System.out.println("\nDoes the Collection"
+ " contains '50':"
+ abs.contains(50));
// Check if the Collection contains 100
System.out.println("Does the collection"
+ " contains '100':"
+ abs.contains(100));
}
}
输出:
AbstractSequentialList:[10, 20, 30, 40, 50] Does the Collection contains '10':true Does the Collection contains '50':true Does the collection contains '100':false
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注:本文由纯净天空筛选整理自Code_r大神的英文原创作品 AbstractSequentialList contains() method in Java with Example。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。