Guava库中Shorts类的toArray()方法用于将作为参数传递给此方法的short值转换为Short数组。这些短值作为Collection传递给此方法。此方法返回一个Short数组。
用法:
public static short[] toArray(Collection<? extends Number> collection)
参数:此方法接受强制性参数集合,该集合是要转换为Short数组的short值的集合。
返回值:此方法以相同的顺序返回包含与集合相同的值的简短数组。
异常:如果传递的集合或其任何元素为null,则此方法将引发NullPointerException。
以下示例程序旨在说明toArray()方法的使用:
范例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]
范例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:
java.lang.NullPointerException
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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 | Shorts.toArray() 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。