Java LongStream.Builder accept()用法及代码示例

LongStream.Builder accept(long t)用于在流的构建阶段将元素插入到元素中。它接受要构建的流的元素。

用法:

void accept(long 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，此方法将引发IllegalStateException。这表示流已进入构建阶段，现在不能更改。因此，不再有其他元素可以被接受到流中。

下面是说明accept()方法的示例：

范例1：

// Java code to show the implementation 
// of LongStream.Builder accept(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 accept(long t) 
        b.accept(4L); 
        b.accept(5L); 
        b.accept(6L); 
        b.accept(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); 
    } 
}

输出：

Stream successfully built
4
5
6
7

范例2：为了说明IllegalStateException

// Java code to show the implementation 
// of LongStream.Builder accept(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 accept(T t) 
        b.accept(4L); 
        b.accept(5L); 
        b.accept(6L); 
        b.accept(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 accept 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 { 
            b.accept(50L); 
        } 
        catch (Exception e) { 
            System.out.println("Exception thrown "
                               + "when now accepting element into the stream:"
                               + e); 
        } 
    } 
}

输出：

Stream successfully built
4
5
6
7
Exception thrown when now accepting element into the stream:java.lang.IllegalStateException

相关用法

注：本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 LongStream.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。