在Java中,数组的indexOf方法是通过Arrays类来调用的。其方法签名为: publicstaticintindexOf(int[]a,intkey) 1. 其中,a为目标数组,key为要查找的元素。下面是一个简单的示例: int[]array={1,2,3,4,5};intindex=Arrays.indexOf(array,3);System.out.println("元素3的索引位置为:"+index); 1. 2. 3...
The indexOf() method returns the position of the first occurrence of a value in the list. If the item is not found in the list then it returns -1.Syntaxpublic int indexOf(Object item)Parameter ValuesParameterDescription item Required. The item to search for in the list....
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Java indexOf方法属于java.util.Arrays$ArrayList类。本文搜集整理了关于Java中java.util.Arrays$ArrayList.indexOf方法 用法示例代码,并附有代码来源和完整...
以下Java 程序获取 ArrayList 中对象的第一次出现的索引。在此示例中,我们正在寻找给定列表中字符串 “alex” 的第一次出现。请注意,字符串 “alex” 在列表中出现三次,但该方法返回第一次出现的索引。 请注意,列表索引从 0 开始。 ArrayList<String> list = new ArrayList<>(Arrays.asList("alex", "brian...
This is the simplest form of the Java indexOf() method.In this example,we are taking an input String in which we are going to find the index of a substring that is a part of the main String. public class indexOf { public static void main(String[] args) { ...
// Java code to show implementation of // Guava's Ints.indexOf(int[] array, // int[] target) method import com.google.common.primitives.Ints; import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating an integer array int[] arr ...
In Java, when working with arrays, there is no built-inindexOf()method, as you might find in other programming languages like JavaScript. However, you can achieve this functionality by converting your array to anArrayListand then using theindexOf()method on theArrayList. ...
The indexOf() method returns the position of the first occurrence of a value in the list. If the item is not found in the list then it returns -1.Syntaxpublic int indexOf(Object item)Parameter ValuesParameterDescription item Required. The item to search for in the list....
ThelastIndexOf()method returns the last index (position) of a specified value. ThelastIndexOf()method returns -1 if the value is not found. ThelastIndexOf()starts at a specified index and searches from right to left (from the given postion to the beginning of the array). ...