ArrayDeque 包含 Java 中的()方法
原文:https://www . geesforgeks . org/arraydeque-contains-method-in-Java/
Java 中的 Java.util.ArrayDeque.contains()方法用于检查或验证一个特定的元素是否存在于 Deque 中。
语法:
Array_Deque.contains(*Object element*)
参数:参数元素属于数组类型。这是需要测试的元素，无论它是否存在于 deque 中。
返回值:如果元素存在于对象中，该方法返回真，否则返回假。
下面的程序说明了 Java.util.ArrayDeque.contains()方法: 程序 1:
// Java code to illustrate contains()
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
// Creating an empty ArrayDeque
Deque<String> de_que = new ArrayDeque<String>();
// Use add() method to add elements into the Queue
de_que.add("Welcome");
de_que.add("To");
de_que.add("Geeks");
de_que.add("4");
de_que.add("Geeks");
// Displaying the ArrayDeque
System.out.println("ArrayDeque: " + de_que);
// Check for "Geeks" in the deque
System.out.println("Does the deque contains 'Geeks'? "
+ de_que.contains("Geeks"));
// Check for "4" in the deque
System.out.println("Does the deque contains '4'? "
+ de_que.contains("4"));
// Check if the deque contains "No"
System.out.println("Does the deque contains 'No'? "
+ de_que.contains("No"));
}
}
Output:
ArrayDeque: [Welcome, To, Geeks, 4, Geeks]
Does the deque contains 'Geeks'? true
Does the deque contains '4'? true
Does the deque contains 'No'? false
程序 2:
// Java code to illustrate contains()
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
// Creating an empty ArrayDeque
Deque<Integer> de_que = new ArrayDeque<Integer>();
// Use add() method to add elements into the Queue
de_que.add(10);
de_que.add(15);
de_que.add(30);
de_que.add(20);
de_que.add(5);
// Displaying the ArrayDeque
System.out.println("ArrayDeque: " + de_que);
// Check for '15' in the Deque
System.out.println("Does the Deque contains '15'? "
+ de_que.contains(15));
// Check for '2' in the Deque
System.out.println("Does the Deque contains '2'? "
+ de_que.contains(2));
// Check if the Deque contains '10'
System.out.println("Does the Deque contains '10'? "
+ de_que.contains(10));
}
}
Output:
ArrayDeque: [10, 15, 30, 20, 5]
Does the Deque contains '15'? true
Does the Deque contains '2'? false
Does the Deque contains '10'? true
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