Java Guava Chars.lastIndexOf()用法及代码示例

Guava库中Chars类的lastIndexOf()方法用于在char数组中查找给定char值的最后一个索引。此要搜索的char值和要在其中搜索的char数组均作为参数传递给此方法。它返回一个整数值，该整数值是指定char值的最后一个索引。如果找不到该值，则返回-1。

用法:

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

参数：此方法接受两个强制性参数：

array:这是在其中搜索char值的char值的数组。
target:要在char数组中搜索最后一个索引的char值。

返回值：此方法返回一个整数值，该整数值是指定char值的最后一个索引。如果找不到该值，则返回-1。

下面的程序演示了此方法：

范例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

范例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)

相关用法

注：本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 Java Guava | Chars.lastIndexOf() method with Examples。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。