Guava – Shorts.toArray()方法及实例

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Guava – Shorts.toArray()方法及实例

Guava库中Shorts类的toArray()方法是用来将作为参数传递给该方法的短值转换成短数组。这些短值被作为一个集合传递给这个方法。该方法返回一个短数组。

语法：

public static short[] toArray(Collection<? extends Number>collection)

参数： 这个方法接受一个强制性的参数集合，它是要转换为短数组的短值集合。

返回值： 该方法返回一个短数组，包含与集合相同的值，顺序相同。

异常情况：如果传递的集合或其任何元素为空，该方法会抛出NullPointerException。

以下程序说明了toArray()方法的使用。

例1:

// Java code to show implementation of// Guava's Shorts.toArray() method  import com.google.common.primitives.Shorts;import java.util.Arrays;import java.util.List;  class GFG {      // Driver's code    public static void main(String[] args)    {          // Creating a List of Shorts        List<Short> myList            = Arrays.asList((short)1, (short)2,                            (short)3, (short)4, (short)5);          // Using Shorts.toArray() method to convert        // a List or Set of Short to an array of Short        short[] arr = Shorts.toArray(myList);          // Displaying an array containing each        // value of collection,        // converted to a short value        System.out.println(Arrays.toString(arr));    }}

输出:

[1, 2, 3, 4, 5]

例2:

// Java code to show implementation of// Guava's Shorts.toArray() method  import com.google.common.primitives.Shorts;import java.util.Arrays;import java.util.List;  class GFG {      // Driver's code    public static void main(String[] args)    {          try {            // Creating a List of Shorts            List<Short> myList                = Arrays.asList((short)2,                                (short)4, null);              // Using Shorts.toArray() method            // to convert a List or Set of Short            // to an array of Short.            // This should raise "NullPointerException"            // as the collection contains "null"            // as an element            short[] arr = Shorts.toArray(myList);              // Displaying an array containing each            // value of collection,            // converted to a short value            System.out.println(Arrays                                   .toString(arr));        }        catch (Exception e) {            System.out.println(e);        }    }}

输出: