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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开始位置。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:将要搜索的数组作为指定数组的sub-sequence。

返回值:该方法返回一个整数值,如下所示:

  • 如果目标数组中存在目标数组,它将返回目标第一次出现的起始位置。
  • 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 = { 1.2, 2.3, 3.4, 
                         4.5, 3.4, 5.6 }; 
  
        double[] target = { 3.4, 4.5, 3.4 }; 
  
        System.out.println("Array:"
                           + Arrays.toString(arr)); 
  
        System.out.println("Target Array:"
                           + Arrays.toString(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:[1.2, 2.3, 3.4, 4.5, 3.4, 5.6]
Target Array:[3.4, 4.5, 3.4]
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 = { 3.2, 5.3, 7.4, 
                         11.4, 13.5 }; 
  
        double[] target = { 17.5, 12.4 }; 
  
        System.out.println("Array:"
                           + Arrays.toString(arr)); 
  
        System.out.println("Target Array:"
                           + Arrays.toString(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:[3.2, 5.3, 7.4, 11.4, 13.5]
Target Array:[17.5, 12.4]
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,本译文的传播和使用请遵循“署名-相同方式共享 4.0 国际 (CC BY-SA 4.0)”协议。