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Java 8 Streams - LongStream.peek Examples

Java 8 Streams Java Java API 

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Interface:

java.util.stream.LongStream

java.lang.AutoCloseableAutoCloseablejava.util.stream.BaseStreamBaseStreamjava.util.stream.LongStreamLongStreamLogicBig

Method:

LongStream peek(LongConsumer action)

This intermediate operation returns a LongStream consisting of the elements of this stream, additionally performing the provided action on each element as elements are consumed from the resulting stream.

Examples


package com.logicbig.example.longstream;

import java.util.stream.LongStream;

public class PeekExample {

    public static void main(String... args) {
        LongStream longStream = LongStream.range(1, 6);
        longStream.peek((x) -> System.out.println("peek " + x))
                  .filter(lg -> lg % 2 == 0)
                  .forEach(System.out::println);
    }
}

Output

peek 1
peek 2
2
peek 3
peek 4
4
peek 5




package com.logicbig.example.longstream;

public class PeekExample2 {

public static void main(String... args) {

}
}

Output





  Parallel stream: 
package com.logicbig.example.longstream;

import java.util.stream.LongStream;

public class PeekExample3 {

    public static void main(String... args) {
        LongStream longStream = LongStream.range(1, 6);
        longStream.parallel()
                  .peek((x) -> System.out.println("peek " + x))
                  .filter(lg -> lg % 2 == 0)
                  .forEach(System.out::println);
    }
}
Output
peek 3
peek 1
peek 2
peek 4
peek 5
2
4






        		
        
            

                

                

                        




                    

                        




                    

                        



                    

                        



                    

                        	

                    

            

           
        		
    

 

  
     

         



     


 

 

  
   

    	

   

   

    

     
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