Guava Chars.indexOf()方法与实例
Guava的Chars类的Chars.indexOf(char[] array, char[] target)方法接受两个参数 array and target 。如果目标存在于数组中，该方法返回其第一次出现的起始位置。如果目标不存在于数组中，该方法返回 -1 .
语法:
public static int indexOf(char[] array, char[] target)
参数: ** 该方法接受两个参数。
array: ，这是一个整数数组，目标数组将在其中检查索引。target: 这是要作为指定数组的子序列进行搜索的数组。返回值： 该方法返回一个整数值，如下所示。
如果目标数组在数组中存在，它返回目标数组第一次出现的起始位置。否则，如果目标数组中不存在，则返回-1。异常情况: 该方法不抛出任何异常。
下面的例子说明了上述方法的实现。
示例1:
// Java code to show implementation of// Guava's Chars.indexOf(char[] array,// char[] target) method import com.google.common.primitives.Chars;import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating an char array char[] arr = { 'G', 'F', 'G', 'E', 'E' }; char[] target = { 'E', 'E' }; System.out.println("Array: " + Arrays.toString(arr)); System.out.println("Target Array: " + Arrays.toString(target)); // Using Chars.indexOf(char[] array, char[] target) // method to get the start position of the first // occurrence of the specified target within array, // or -1 if there is no such occurrence. int index = Chars.indexOf(arr, target); if (index != -1) { System.out.println("Target is present at index " + index); } else { System.out.println("Target is not present " + "in the array"); } }}
输出:
Array: [G, F, G, E, E]Target Array: [E, E]Target is present at index 3
示例2:
// Java code to show implementation of// Guava's Chars.indexOf(char[] array,// char[] target) method import com.google.common.primitives.Chars;import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating an char array char[] arr = { 'H', 'E', 'L', 'L', 'O' }; char[] target = { 'G', 'E', 'E' }; System.out.println("Array: " + Arrays.toString(arr)); System.out.println("Target Array: " + Arrays.toString(target)); // Using Chars.indexOf(char[] array, char[] target) // method to get the start position of the first // occurrence of the specified target within array, // or -1 if there is no such occurrence. int index = Chars.indexOf(arr, target); if (index != -1) { System.out.println("Target is present at index " + index); } else { System.out.println("Target is not present" + " in the array"); } }}
输出:
Array: [H, E, L, L, O]Target Array: [G, E, E]Target is not present in the array
参考: https://google.github.io/guava/releases/23.0/api/docs/com/google/common/primitives/Chars.html#indexOf-char:A-char:A-
