Java Guava Booleans.lastIndexOf()用法及代码示例

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

用法:

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

参数：此方法接受两个强制性参数：

array:这是要在其中搜索布尔值的布尔值数组。
target:这是要在布尔数组中搜索最后一个索引的布尔值。

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

下面的程序演示了此方法：

示例1：

// Java code to show implementation of 
// Guava's Booleans.lastIndexOf() method 
  
import com.google.common.primitives.Booleans; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
        // Creating a boolean array 
        boolean[] arr = { true, false, false, 
                          true, true }; 
  
        boolean target = true; 
  
        // Using Booleans.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 = Booleans.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 4

示例2：

// Java code to show implementation of 
// Guava's Booleans.lastIndexOf() method 
  
import com.google.common.primitives.Booleans; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
        // Creating a boolean array 
        boolean[] arr = { true, true, true, 
                          true, true }; 
  
        boolean target = false; 
  
        // Using Booleans.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 = Booleans.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/20.0/api/docs/com/google/common/primitives/Booleans.html#lastIndexOf-boolean:A-boolean-

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 | Booleans.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。