Java Guava Ints indexOf()用法及代碼示例

Guava 的Ints.indexOf(int [] array，int target)方法返回值目標在數組中首次出現的索引。

用法:

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

參數：此方法接受以下參數：

array:一個int值數組，可能為空。
target:基本的int值。

返回值：此方法返回array [i] ==目標的最小索引i，如果不存在這樣的索引，則返回-1。

範例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"); 
        } 
    } 
}

輸出：

Target is present at index 2

範例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"); 
        } 
    } 
}

輸出：

Target is not present in the array

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

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