Java Longs.indexOf(long[] array, long target)用法及代碼示例

Guava Longs Class的Longs.indexOf(long [] array，long target)方法接受兩個參數array和target。如果目標存在於數組中，則該方法返回其首次出現的位置。如果目標在數組中不存在，則該方法返回-1。

用法:

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

參數：該方法接受兩個參數：

array:這是要在其中檢查目標數組的索引的整數數組。
target:這是要在指定數組中作為元素搜索的值。

返回值：該方法返回一個整數值，如下所示：

如果目標存在於數組中，它將返回目標第一次出現的位置。
否則，如果目標在數組中不存在，則返回-1。

異常：該方法不會引發任何異常。

以下示例說明了上述方法的實現：

範例1：

// Java code to show implementation of 
// Guava's Longs.indexOf(long[] array, 
// long target) method 
  
import com.google.common.primitives.Longs; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an long array 
        long[] arr = { 1, 2, 3, 4, 3, 5 }; 
  
        long target = 3; 
  
        System.out.println("Array:"
                           + Arrays.toString(arr)); 
  
        System.out.println("Target:" + target); 
  
        // Using Longs.indexOf(long[] array, long 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 = Longs.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"); 
        } 
    } 
}

輸出：

Array:[1, 2, 3, 4, 3, 5]
Target:3
Target is present at index 2

範例2：

// Java code to show implementation of 
// Guava's Longs.indexOf(long[] array, 
// long target) method 
  
import com.google.common.primitives.Longs; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an long array 
        long[] arr = { 3, 5, 7, 11, 13 }; 
  
        long target = 23; 
  
        System.out.println("Array:"
                           + Arrays.toString(arr)); 
  
        System.out.println("Target:" + target); 
  
        // Using Longs.indexOf(long[] array, long 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 = Longs.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"); 
        } 
    } 
}

輸出：

Array:[3, 5, 7, 11, 13]
Target:23
Target is not present in the array

參考： https://google.github.io/guava/releases/21.0/api/docs/com/google/common/primitives/Longs.html#indexOf-long:A-long-

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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 | Longs.indexOf(long[] array, long target) 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。