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

Guava Doubles Class的Doubles.indexOf(double [] array，double target)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(double[] array, double 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 Doubles.indexOf(double[] array, 
// double target) method 
  
import com.google.common.primitives.Doubles; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an double array 
        double[] arr = { 3.2, 5.3, 7.4, 11.4, 13.5 }; 
  
        double target = 7.4; 
  
        System.out.println("Array:"
                           + Arrays.toString(arr)); 
  
        System.out.println("Target:" + target); 
  
        // Using Doubles.indexOf(double[] array, double 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 = Doubles.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:[3.2, 5.3, 7.4, 11.4, 13.5]
Target:7.4
Target is present at index 2

范例2：

// Java code to show implementation of 
// Guava's Doubles.indexOf(double[] array, 
// double target) method 
  
import com.google.common.primitives.Doubles; 
import java.util.Arrays; 
  
class GFG { 
  
    // Driver's code 
    public static void main(String[] args) 
    { 
  
        // Creating an double array 
        double[] arr = { 3, 5, 7, 11, 13 }; 
  
        double target = 23; 
  
        System.out.println("Array:"
                           + Arrays.toString(arr)); 
  
        System.out.println("Target:" + target); 
  
        // Using Doubles.indexOf(double[] array, double 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 = Doubles.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:[3.0, 5.0, 7.0, 11.0, 13.0]
Target:23.0
Target is not present in the array

参考： https://google.github.io/guava/releases/19.0/api/docs/com/google/common/primitives/Doubles.html#indexOf(double[], %20double)

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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 | Doubles.indexOf(double[] array, double 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。