Java Guava Bytes.lastIndexOf()用法及代码示例

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

用法:

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

参数：此方法接受两个强制性参数：

array:这是要在其中搜索字节值的字节值数组。
target:要搜索的字节值，它是字节数组中的最后一个索引。

返回值：此方法返回一个整数值，该整数值是指定字节值的最后一个索引。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 Bytes.lastIndexOf() method 
  
import com.google.common.primitives.Bytes; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating a byte array 
        byte[] arr = { 1, 2, 3, 4, 3, 5, 3, 4 }; 
  
        byte target = 3; 
  
        // Using Bytes.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 
            = Bytes.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 Bytes.lastIndexOf() method 
  
import com.google.common.primitives.Bytes; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
        // Creating a byte array 
        byte[] arr = { 3, 5, 7, 11, 13 }; 
  
        byte target = 17; 
  
        // Using Bytes.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 
            = Bytes.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/19.0/api/docs/com/google/common/primitives/Bytes.html#lastIndexOf(byte[], %20byte)

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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 | Bytes.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。