Java Guava Bytes.lastIndexOf()用法及代碼示例

Guava庫中Bytes類的lastIndexOf()方法用於在字節數組中查找給定字節值的最後一個索引。此要搜索的字節值和要在其中搜索的字節數組都作為參數傳遞給此方法。它返回一個整數值，該整數值是指定字節值的最後一個索引。如果找不到該值，則返回-1。

用法:

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

參數：此方法接受兩個強製性參數：

array:這是要在其中搜索字節值的字節值數組。
target:要搜索的字節值，它是字節數組中的最後一個索引。

返回值：此方法返回一個整數值，該整數值是指定字節值的最後一個索引。如果找不到該值，則返回-1。

下麵的程序演示了此方法：

範例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"); 
        } 
    } 
}

輸出：

Target is present at index 6

範例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"); 
        } 
    } 
}

輸出：

Target is not present in the array

參考： https://google.github.io/guava/releases/19.0/api/docs/com/google/common/primitives/Bytes.html#lastIndexOf(byte[], %20byte)

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注：本文由純淨天空篩選整理自Sahil_Bansall大神的英文原創作品 Java Guava | Bytes.lastIndexOf() method with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。