LongStream。Java 中的 Builder add(长 t)
原文:https://www . geesforgeks . org/longstream-builder-addlong-t-in-Java/
LongStream。Builder add(long t) 用于在 stream 的构建阶段将元素插入到元素中。它向正在构建的流中添加一个元素。
语法:
default LongStream.Builder add(long t)
参数:该方法接受一个强制参数 t ，它是输入到流中的元素。
异常:当构建器已经转换到构建状态时，该方法抛出非法状态异常。这意味着该流已经进入构建阶段，现在不能更改。因此，没有更多的元素可以添加到流中。
以下是说明 add()方法的示例:
例 1:
// Java code to show the implementation
// of LongStream.Builder add(long t)
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Declaring an empty Stream
LongStream.Builder b = LongStream.builder();
// Inserting elements into the stream
// using LongStream.Builder add(long t)
b.add(4L);
b.add(5L);
b.add(6L);
b.add(7L);
// Creating the Stream
// The stream has now entered the built phase
// printing the elements
System.out.println("Stream successfully built");
b.build().forEach(System.out::println);
}
}
Output:
Stream successfully built
4
5
6
7
示例 2: 说明 IllegalStateException
// Java code to show the implementation
// of LongStream.Builder add(T t)
import java.util.stream.LongStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Declaring an empty Stream
LongStream.Builder b = LongStream.builder();
// using LongStream.Builder add(T t)
b.add(4L);
b.add(5L);
b.add(6L);
b.add(7L);
// Creating the Stream
// The stream has now entered the built phase
// printing the elements
System.out.println("Stream successfully built");
b.build().forEach(System.out::println);
// Trying to add another element into the stream
// Since the Stream is in built phase
// This operation is not possible now
// Hence add() will throw exception now
try {
b.add(50L);
}
catch (Exception e) {
System.out.println("Exception thrown "
+ "when now adding element into the stream: "
+ e);
}
}
}
Output:
Stream successfully built
4
5
6
7
Exception thrown when now adding element into the stream: java.lang.IllegalStateException
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