Java 中的 ArrayDeque removefirst occurrence()方法
原文:https://www . geeksforgeeks . org/arraydeque-removefirst occurrence-method-in-Java/
java 中的 Java . util . arraydeque . removefirst occurrence(Object)方法用于从该对象中移除特定元素的第一次出现。如果该元素只出现一次,则移除该元素并返回 true。如果没有删除这样的元素,则返回 false。
语法:
Array_Deque.removeFirstOccurrence(*Object O*)
参数:该方法取 ArrayDeque 类型的一个参数 O ,指的是第一次出现的元素要被移除。
返回值:如果元素存在于地图中,该方法返回真,否则返回假。
下面的程序说明了 Java . util . arraydeque . removefirst occurrence()方法:
程序 1 :
// Java code to illustrate removeFirstOccurrence()
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 Deque
de_que.add("Welcome");
de_que.add("To");
de_que.add("Geeks");
de_que.add("For");
de_que.add("Geeks");
// Displaying the ArrayDeque
System.out.println("Initial ArrayDeque: " + de_que);
// Removing elements using removeFirstOccurrence() method
de_que.removeFirstOccurrence("Geeks");
de_que.removeFirstOccurrence("For");
// Displaying the ArrayDeque after removal
System.out.println("ArrayDeque after removing "
+ "elements: " + de_que);
}
}
Output:
Initial ArrayDeque: [Welcome, To, Geeks, For, Geeks]
ArrayDeque after removing elements: [Welcome, To, Geeks]
程序 2:
// Java code to illustrate removeFirstOccurrence()
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 Deque
de_que.add(10);
de_que.add(10);
de_que.add(30);
de_que.add(10);
de_que.add(30);
// Displaying the ArrayDeque
System.out.println("Initial ArrayDeque: " + de_que);
// Removing elements using removeFirstOccurrence() method
de_que.removeFirstOccurrence(30);
de_que.removeFirstOccurrence(5);
// Displaying the ArrayDeque after removal
System.out.println("ArrayDeque after removing "
+ "elements: " + de_que);
}
}
Output:
Initial ArrayDeque: [10, 10, 30, 10, 30]
ArrayDeque after removing elements: [10, 10, 10, 30]
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