Java Guava Ints indexOf()用法及代码示例

Guava 的Ints.indexOf(int [] array，int target)方法返回值目标在数组中首次出现的索引。

用法:

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

参数：此方法接受以下参数：

array:一个int值数组，可能为空。
target:基本的int值。

返回值：此方法返回array [i] ==目标的最小索引i，如果不存在这样的索引，则返回-1。

范例1：

// Java code to show implementation of 
// Guava's Ints.indexOf() method 
  
import com.google.common.primitives.Ints; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an integer array 
        int[] arr = { 1, 2, 3, 4, 3, 5 }; 
  
        int target = 3; 
  
        // Using Ints.indexOf(int[] array, int target) 
        // method to get the index of first appearance 
        // of a given element in array and return -1 
        // if element is not found in the array 
        int index = Ints.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：

Target is present at index 2

范例2：

// Java code to show implementation of 
// Guava's Ints.indexOf() method 
  
import com.google.common.primitives.Ints; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an integer array 
        int[] arr = { 3, 5, 7, 11, 13 }; 
  
        int target = 17; 
  
        // Using Ints.indexOf(int[] array, int target) method 
        // to get the index of first appearance of a 
        // given element in array and return -1 if 
        // element is not found in the array 
        int index = Ints.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：

Target is not present in the array

参考： https://google.github.io/guava/releases/22.0/api/docs/com/google/common/primitives/Ints.html#indexOf-int:A-int-

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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 Ints indexOf() function | Guava | Java。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。