DoubleStream.Builder add(double 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:
default DoubleStream.Builder add(double 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add()方法的示例:
范例1:
// Java code to show the implementation
// of DoubleStream.Builder add(double t)
import java.util.stream.DoubleStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Declaring an empty Stream
DoubleStream.Builder b = DoubleStream.builder();
// Inserting elements into the stream
// using DoubleStream.Builder add(double t)
b.add(4.4);
b.add(5.84);
b.add(6);
b.add(7.47);
// 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);
}
}
输出:
Stream successfully built 4.4 5.84 6.0 7.47
范例2:为了说明IllegalStateException
// Java code to show the implementation
// of DoubleStream.Builder add(T t)
import java.util.stream.DoubleStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// Declaring an empty Stream
DoubleStream.Builder b = DoubleStream.builder();
// using DoubleStream.Builder add(T t)
b.add(4.7);
b.add(5.9);
b.add(6);
b.add(7.785);
// 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(50.784);
}
catch (Exception e) {
System.out.println("Exception thrown "
+ "when now adding element into the stream:"
+ e);
}
}
}
输出:
Stream successfully built 4.7 5.9 6.0 7.785 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 DoubleStream.Builder add(double t) in Java 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。