Stream.Builder accept(T t)用于在流的构建阶段将元素插入到元素中。它将元素添加到正在构建的流中。
用法:
void accept(T t)
参数:此方法接受强制参数t,该参数是要输入到流中的元素。
Exceptions:当构建器已经转换到构建状态时,此方法引发IllegalStateException :。这表示流已进入构建阶段,现在不能更改。因此,无法将更多元素添加到流中。
下面是说明accept()方法的示例:
范例1:
// Java code to show the implementation
// of Stream.Builder accept(T t)
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Declaring an empty Stream
Stream.Builder<String> str_b = Stream.builder();
// Inserting elements into the stream
// using Stream.Builder accept(T t)
str_b.accept("Geeks");
str_b.accept("for");
str_b.accept("GeeksforGeeks");
str_b.accept("Data Structures");
str_b.accept("Geeks Classes");
// Creating the String Stream
// The stream has now entered the built phase
Stream<String> s = str_b.build();
// printing the elements
System.out.println("Stream successfully built");
s.forEach(System.out::println);
}
}
输出:
Stream successfully built Geeks for GeeksforGeeks Data Structures Geeks Classes
范例2:为了说明IllegalStateException
// Java code to show the implementation
// of Stream.Builder accept(T t)
import java.util.stream.Stream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Declaring an empty Stream
Stream.Builder<String> str_b = Stream.builder();
// using Stream.Builder accept(T t)
str_b.accept("5");
str_b.accept("6");
str_b.accept("7");
str_b.accept("8");
str_b.accept("9");
// Creating the String Stream
// The stream has now entered the built phase
Stream<String> s = str_b.build();
// printing the elements
System.out.println("Stream successfully built");
s.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 accept() will throw exception now
try {
str_b.accept("50");
}
catch (Exception e) {
System.out.println("Exception thrown "
+ "when now adding element into the stream:"
+ e);
}
}
}
输出:
Stream successfully built 5 6 7 8 9 Exception thrown when now adding element into the stream:java.lang.IllegalStateException
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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 Stream.Builder accept() method in Java。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。