用 Java 流至数组()，示例
原文:https://www.geeksforgeeks.org/stream-toarray-java-examples/
Stream toArray() 返回包含该流元素的数组。这是一个 终端操作 ，也就是说，它可能穿越河流产生结果或副作用。执行终端操作后，流管道被认为已消耗，不能再使用。
语法:
Object[] toArray()
返回值:函数返回一个包含该流元素的数组。
例 1 :
// Java code for Stream toArray()
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a Stream of Integers
Stream<Integer> stream = Stream.of(5, 6, 7, 8, 9, 10);
// Using Stream toArray()
Object[] arr = stream.toArray();
// Displaying the elements in array arr
System.out.println(Arrays.toString(arr));
}
}
输出:
[5, 6, 7, 8, 9, 10]
例 2 :
// Java code for Stream toArray()
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a Stream of Strings
Stream<String> stream = Stream.of("Geeks", "for",
"Geeks", "GeeksQuiz");
// Using Stream toArray()
Object[] arr = stream.toArray();
// Displaying the elements in array arr
System.out.println(Arrays.toString(arr));
}
}
输出:
[Geeks, for, Geeks, GeeksQuiz]
例 3 :
// Java code for Stream toArray()
import java.util.*;
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Creating a Stream of Strings
Stream<String> stream = Stream.of("Geeks", "for",
"gfg", "GeeksQuiz");
// Using Stream toArray() and filtering
// the elements that starts with 'G'
Object[] arr = stream.filter(str
-> str.startsWith("G"))
.toArray();
// Displaying the elements in array arr
System.out.println(Arrays.toString(arr));
}
}
输出:
[Geeks, GeeksQuiz]
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