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Java Bytes.indexOf(byte[] array, byte target)用法及代码示例


Guava的Bytes类的Bytes.indexOf(byte []数组,字节目标)方法接受两个参数array和target。如果目标存在于数组中,则该方法返回其首次出现的位置。如果目标在数组中不存在,则该方法返回-1。

用法:

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



参数:该方法接受两个参数:

  • array:这是要在其中检查目标数组的索引的整数数组。
  • target:这是要在指定数组中作为元素搜索的值。

返回值:该方法返回一个整数值,如下所示:

  • 如果目标存在于数组中,它将返回目标第一次出现的位置。
  • 否则,如果目标在数组中不存在,则返回-1。

异常:该方法不会引发任何异常。

以下示例说明了上述方法的实现:

范例1:

// Java code to show implementation of 
// Guava's Bytes.indexOf(byte[] array, 
// byte target) method 
  
import com.google.common.primitives.Bytes; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an byte array 
        byte[] arr = { 1, 2, 3, 4, 3, 5 }; 
  
        byte target = 3; 
  
        System.out.println("Array:"
                           + Arrays.toString(arr)); 
  
        System.out.println("Target:" + target); 
  
        // Using Bytes.indexOf(byte[] array, byte target) 
        // method to get the position of the first 
        // occurrence of the specified target within array, 
        // or -1 if there is no such occurrence. 
        int index = Bytes.indexOf(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:
Array:[1, 2, 3, 4, 3, 5]
Target:3
Target is present at index 2

范例2:

// Java code to show implementation of 
// Guava's Bytes.indexOf(byte[] array, 
// byte target) method 
  
import com.google.common.primitives.Bytes; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an byte array 
        byte[] arr = { 3, 5, 7, 11, 13 }; 
  
        byte target = 23; 
  
        System.out.println("Array:"
                           + Arrays.toString(arr)); 
  
        System.out.println("Target:" + target); 
  
        // Using Bytes.indexOf(byte[] array, byte target) 
        // method to get the start position of the first 
        // occurrence of the specified target within array, 
        // or -1 if there is no such occurrence. 
        int index = Bytes.indexOf(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:
Array:[3, 5, 7, 11, 13]
Target:23
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#indexOf(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.indexOf(byte[] array, byte target) 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。