Java中的Stream builder（）及其示例-yiteyi-C++库

流生成器（） 返回流的生成器。

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语法：

static <T> Stream.Builder<T> builder()

where, T is the type of elements.

返回值： 溪流建设者。

例1：

                     // Java code for Stream builder()                   
                     import                               java.util.*;                   
                     import                               java.util.stream.Stream;                   
                             
                     class                               GFG {                   
                             
                                         // Driver code                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         // Using Stream builder()                   
                                         Stream.Builder<String> builder = Stream.builder();                   
                             
                                         // Adding elements in the stream of Strings                   
                                         Stream<String> stream = builder.add(                               "Geeks"                               ).build();                   
                             
                                         // Displaying the elements in the stream                   
                                         stream.forEach(System.out::println);                   
                                         }                   
                     }                   

输出：

Geeks

例2：

                     // Java code for Stream builder()                   
                     import                               java.util.*;                   
                     import                               java.util.stream.Stream;                   
                             
                     class                               GFG {                   
                             
                                         // Driver code                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         // Using Stream builder()                   
                                         Stream.Builder<String> builder = Stream.builder();                   
                             
                                         // Adding elements in the stream of Strings                   
                                         Stream<String> stream = builder.add(                               "Geeks"                               )                   
                                         .add(                               "for"                               )                   
                                         .add(                               "Geeks"                               )                   
                                         .add(                               "GeeksQuiz"                               )                   
                                         .build();                   
                             
                                         // Displaying the elements in the stream                   
                                         stream.forEach(System.out::println);                   
                                         }                   
                     }                   

输出：

Geeks
for
Geeks
GeeksQuiz

例3：

                     // Java code for Stream builder()                   
                     import                               java.util.*;                   
                     import                               java.util.stream.Stream;                   
                     import                               java.util.stream.Collectors;                   
                             
                     class                               GFG {                   
                             
                                         // Driver code                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                                         // Using Stream builder()                   
                                         Stream.Builder<String> builder = Stream.builder();                   
                             
                                         // Adding elements in the stream of Strings                   
                                         Stream<String> stream = builder.add(                               "GEEKS"                               )                   
                                         .add(                               "for"                               )                   
                                         .add(                               "Geeks"                               )                   
                                         .add(                               "GeEKSQuiz"                               )                   
                                         .build();                   
                             
                                         // Converting elements to Lower Case                   
                                         // and storing them in List list                   
                                         List<String> list = stream.map(String::toLowerCase)                   
                                         .collect(Collectors.toList());                   
                             
                                         // Displaying the elements in list                   
                                         System.out.println(list);                   
                                         }                   
                     }                   

输出：

[geeks, for, geeks, geeksquiz]

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