Java中的Stream builder()及其示例

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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