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Java Deque removeLastOccurrence()用法及代码示例


Deque 接口的 removeLastOccurrence() 方法用于从给定的双端队列中删除最后一次出现的指定元素。如果双端队列中没有元素，则它保持不变。如果指定的元素存在于双端队列中，则上述方法返回 true。

用法:

boolean removeLastOccurrence(Object o)

参数：

以上只需要一个参数：

  1. 需要从给定双端队列中删除的元素 'o'。

返回：

上述方法用于在指定元素被移除时返回true。

抛出：

  • ClassCastException- 如果指定的元素与给定的双端队列不兼容。
  • NullPointerException - 如果指定的元素已经为空并且给定的双端队列不允许空元素。

例子1

import java.util.ArrayDeque;
import java.util.Deque;

public class JavaDequeremoveLastOccurrenceExample1 {
   public static void main(String[] args) {
	   Deque<Character> deque = new ArrayDeque<>();
	    deque.push('a'); 
	    deque.push('d');
	    deque.push('c');
	    deque.push('b');
	    deque.push('a');
	    boolean val = deque.removeLastOccurrence('a');
	    System.out.println("The value is already present in the deque:"+val);
	  System.out.println("The final deque is given as:");   
	  for (Character character:deque) {
		System.out.println(character);
	   }
	}
}

输出：

The value is already present in the deque:true
The final deque is given as:
a
b
c
d

例子2

import java.util.ArrayDeque;
import java.util.Deque;

public class JavaDequeremoveLastOccurrenceExample2 {
   public static void main(String[] args) {
	   Deque<Long> deque = new ArrayDeque<>();
	    deque.add(23l); 
	    deque.add(45l);
	    deque.add(63l);
	    deque.add(45l);  
	boolean val = deque.removeLastOccurrence(55l);
	    System.out.println("The value is already present in the deque:"+val);
	  System.out.println("The final deque is given as:");   
	 for (Long long1:deque) {
		System.out.println(long1);
	  }
   }
}

输出：

The value is already present in the deque:false
The final deque is given as:
23
45
63
45

例子3

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeremoveLastOccurrenceExample3 {
   public static void main(String[] args) {
	   Deque<Float> deque = new ArrayDeque<>();
	    deque.add(55.8f); 
	    deque.add(22.3f);
	    deque.add(89f);
	    deque.add(22.3f);  
	boolean val = deque.removeLastOccurrence(22.3f);
	  System.out.println("The value is already present in the deque:"+val);
	  System.out.println("The final deque is given as:");   
	for (Float float1:deque) {
		System.out.println(float1);
	}
   }
}

输出：

The value is already present in the deque:true
The final deque is given as:
55.8
22.3
89.0




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注：本文由纯净天空筛选整理自 Java Deque removeLastOccurrence() Method。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。