Guava Chars.lastIndexOf()方法与实例

Guava库中Chars类的lastIndexOf()方法用于查找char数组中给定char值的最后索引。这个要搜索的char值和要搜索的char数组，都作为参数传递给这个方法。它返回一个整数值，这个整数值是指定的char值的最后索引。如果没有找到该值，它将返回-1.

语法:

public static int lastIndexOf(char[] array,                              char target)

参数: 该方法接受两个强制性的参数:

返回值：该方法返回一个整数值，它是指定char值的最后一个索引。如果没有找到该值，它将返回-1。

下面的程序说明了这个方法：

示例1:

// Java code to show implementation of// Guava's Chars.lastIndexOf() method  import com.google.common.primitives.Chars;import java.util.Arrays;  class GFG {      // Driver's code    public static void main(String[] args)    {          // Creating a char array        char[] arr = { 'a', 'b', 'c', 'd',                       'b', 'c', 'b', 'd' };          char target = 'b';          // Using Chars.lastIndexOf() method        // to get the index of last appearance        // of a given element in array        // and return -1 if element is        // not found in the array        int index            = Chars.lastIndexOf(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:

Target is present at index 6

示例2:

// Java code to show implementation of// Guava's Chars.lastIndexOf() method  import com.google.common.primitives.Chars;import java.util.Arrays;  class GFG {      // Driver's code    public static void main(String[] args)    {        // Creating a char array        char[] arr = { 'a', 'b', 'c', 'd',                       'b', 'c', 'b', 'd' };          char target = 'z';          // Using Chars.lastIndexOf() method        // to get the index of last appearance        // of a given element in array        // and return -1 if element is        // not found in the array        int index            = Chars.lastIndexOf(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:

Target is not present in the array

参考:[https://google.github.io/guava/releases/18.0/api/docs/com/google/common/primitives/Chars.html#lastIndexOf(char[], %20char)](https://google.github.io/guava/releases/18.0/api/docs/com/google/common/primitives/Chars.html#lastIndexOf(char[], char))