爪哇番石榴|短裤. toArray()方法带示例
原文:https://www . geesforgeks . org/Java-guava-shots-to array-method-with-examples/
番石榴库中 短裤类 的 toArray() 方法用于将作为参数传递给该方法的短值转换为短数组。这些短值作为集合传递给此方法。此方法返回一个短数组。
语法:
公静短[] toArray(集合<？延伸号>集合)
参数:该方法接受一个强制参数集合，该集合是要转换为短数组的短值集合。
返回值:这个方法返回一个短数组，包含与集合相同的值，顺序相同。
异常:如果传递的集合或其任何元素为空，该方法将抛出 空指针异常 。
下面的程序说明了 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:
java.lang.NullPointerException
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