Java CopyOnWriteArrayList lastIndexOf(E e, int index) 方法

2025 年 3 月 21 日 | 阅读 2 分钟

Java CopyOnWriteArrayList 类的 lastIndexOf(E e, int index) 方法在列表中向后搜索指定元素的最后一次出现，并返回该元素的索引。如果列表中不存在该元素，则返回 -1。

语法

参数

e - 要搜索的元素

index - 开始向后搜索的索引

返回值

此方法返回列表中索引小于或等于 index 的元素的最后一次出现的位置。如果列表中不存在该元素，则此方法返回 -1。

示例 1

import java.util.concurrent.CopyOnWriteArrayList;

public class CopyOnWriteArrayListLastIndexOfExample1{
	
	public static void main(String[] args) {
		//Initializing CopyOnWriteArrayList of Integers
		CopyOnWriteArrayList<Integer>numbers = new CopyOnWriteArrayList<>(new Integer[] {1,2,1,4,5,3,3,8});
		//Prints the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
		System.out.println("Last Index of 3 is : " + numbers.lastIndexOf(3, 7));	
			}
	}

输出

Last Index of 3 is : 6

示例 2

import java.util.concurrent.CopyOnWriteArrayList;

public class CopyOnWriteArrayListLastIndexOfExample2{
	
	public static void main(String[] args) {
		//Initializing CopyOnWriteArrayList of Integers
		CopyOnWriteArrayList<Integer>numbers = new CopyOnWriteArrayList<>(new Integer[] {1,2,1,4,5,3,3,8});
		//Prints the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
		System.out.println("Last Index of 3 is : " + numbers.lastIndexOf(11, 7));
			}
		}

输出

Last Index of 11 is : -1

示例 3

import java.util.concurrent.CopyOnWriteArrayList;

public class CopyOnWriteArrayListLastIndexOfExample3{
	
	public static void main(String[] args) {
		//Initializing CopyOnWriteArrayList of Strings
		CopyOnWriteArrayList<String>listOfNames = new CopyOnWriteArrayList<>(new String[] {"Tom","Harry","John","John","John","Jerry"});
		//Prints the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
		System.out.println("Last Index of John is : " + listOfNames.lastIndexOf("John", 5));
			}
		}

输出

Last Index of John is : 4

示例 4

import java.util.concurrent.CopyOnWriteArrayList;

public class CopyOnWriteArrayListLastIndexOfExample4{
	
	public static void main(String[] args) {
		//Initializing CopyOnWriteArrayList of Strings
		CopyOnWriteArrayList<String>listOfNames = new CopyOnWriteArrayList<>(new String[] {"Tom","Harry","John","John","John","Jerry"});
		//Prints the index of the last occurrence of the specified element in this list, searching backwards from index, or returns -1 if the element is not found.
		System.out.println("Last Index of Lincoln is : " + listOfNames.lastIndexOf("Lincoln", 5));	
			}	
	}

输出

Last Index of Lincoln is : -1

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Java CopyOnWriteArrayList lastIndexOf(E e, int index) 方法

语法

参数

返回值

示例 1

示例 2

示例 3

示例 4

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