Java DoubleStream.Builder accept()用法及代碼示例

DoubleStream.Builder accept(double t)用於在流的構建階段將元素插入到元素中。它接受要構建的流的元素。

用法:

void accept(double t)

參數：此方法接受強製參數t，該參數是要輸入到流中的元素。

Exceptions:當構建器已經轉換到構建狀態時，此方法將引發IllegalStateException。這表示流已進入構建階段，現在不能更改。因此，不再有其他元素可以被接受到流中。

下麵是說明accept()方法的示例：

範例1：

// Java code to show the implementation 
// of DoubleStream.Builder accept(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 accept(double t) 
        b.accept(45.54); 
        b.accept(415.2541); 
        b.accept(12.21); 
        b.accept(778); 
  
        // 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); 
    } 
}

輸出：

Stream successfully built
45.54
415.2541
12.21
778.0

範例2：為了說明IllegalStateException

// Java code to show the implementation 
// of DoubleStream.Builder accept(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(); 
  
        // using DoubleStream.Builder accept(double t) 
        b.accept(45.54); 
        b.accept(415.2541); 
        b.accept(12.21); 
        b.accept(778); 
  
        // 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(75.1452); 
        } 
        catch (Exception e) { 
            System.out.println("Exception thrown "
                               + "when now accepting element into the stream:"
                               + e); 
        } 
    } 
}

輸出：

Stream successfully built
45.54
415.2541
12.21
778.0
Exception thrown when now accepting element into the stream:java.lang.IllegalStateException

相關用法

注：本文由純淨天空篩選整理自Sahil_Bansall大神的英文原創作品 DoubleStream.Builder accept() method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。