Click here to watch in Youtube :
https://www.youtube.com/watch?v=HHdtl6fOjCM&list=UUhwKlOVR041tngjerWxVccw
StreamDemo1.java
https://www.youtube.com/watch?v=HHdtl6fOjCM&list=UUhwKlOVR041tngjerWxVccw
StreamDemo1.java
import java.util.ArrayList; import java.util.List; /** * * Terminal operations return a result of a certain type instead of * again a Stream. * */ public class StreamDemo1 { public static void main(String[] args) { List<String> nameList = new ArrayList<>(); nameList.add("Amitabh"); nameList.add("Shekhar"); nameList.add("Aman"); nameList.add("Rahul"); nameList.add("Shahrukh"); nameList.add("Salman"); nameList.add("Yana"); nameList.add("Lokesh"); /* * This method helps in iterating over all elements of a * stream and perform some operation on each of them. The * operation is passed as lambda expression parameter. */ nameList.forEach(System.out::println); } }Output
Amitabh Shekhar Aman Rahul Shahrukh Salman Yana LokeshStreamDemo2.java
import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; /** * * Terminal operations return a result of a certain type instead of * again a Stream. * */ public class StreamDemo2 { public static void main(String[] args) { List<String> nameList = new ArrayList<>(); nameList.add("Amitabh"); nameList.add("Shekhar"); nameList.add("Aman"); nameList.add("Rahul"); nameList.add("Shahrukh"); nameList.add("Salman"); nameList.add("Yana"); nameList.add("Lokesh"); /* * collect() method used to receive elements from a stream and * store them in a collection. */ List<String> upperCaseNameList = nameList.stream() .sorted() .map(String::toUpperCase) .collect(Collectors.toList()); System.out.print(upperCaseNameList); } }Output
[AMAN, AMITABH, LOKESH, RAHUL, SALMAN, SHAHRUKH, SHEKHAR, YANA]StreamDemo3.java
import java.util.ArrayList; import java.util.List; /** * * Terminal operations return a result of a certain type instead of * again a Stream. * */ public class StreamDemo3 { public static void main(String[] args) { List<String> nameList = new ArrayList<>(); nameList.add("Amitabh"); nameList.add("Shekhar"); nameList.add("Aman"); nameList.add("Rahul"); nameList.add("Shahrukh"); nameList.add("Salman"); nameList.add("Yana"); nameList.add("Lokesh"); /* * Various matching operations can be used to check whether a * certain predicate matches the stream. All of those * operations are terminal and return a boolean result. */ boolean matchedResult = nameList.stream() .anyMatch((s) -> s.startsWith("A")); System.out.println(matchedResult); matchedResult = nameList.stream() .allMatch((s) -> s.startsWith("A")); System.out.println(matchedResult); matchedResult = nameList.stream() .noneMatch((s) -> s.startsWith("A")); System.out.println(matchedResult); } }Output
true false falseStreamDemo4.java
import java.util.ArrayList; import java.util.List; /** * * Terminal operations return a result of a certain type instead of * again a Stream. * */ public class StreamDemo4 { public static void main(String[] args) { List<String> nameList = new ArrayList<>(); nameList.add("Amitabh"); nameList.add("Shekhar"); nameList.add("Aman"); nameList.add("Rahul"); nameList.add("Shahrukh"); nameList.add("Salman"); nameList.add("Yana"); nameList.add("Lokesh"); /* * Count is a terminal operation returning the number of * elements in the stream as a long. */ long totalMatched = nameList.stream() .filter((s) -> s.startsWith("A")) .count(); System.out.println(totalMatched); } }Output
2
StreamDemo5.javaimport java.util.ArrayList; import java.util.List; import java.util.Optional; /** * * Terminal operations return a result of a certain type instead of * again a Stream. * */ public class StreamDemo5 { public static void main(String[] args) { List<String> nameList = new ArrayList<>(); nameList.add("Amitabh"); nameList.add("Shekhar"); nameList.add("Aman"); nameList.add("Rahul"); nameList.add("Shahrukh"); nameList.add("Salman"); nameList.add("Yana"); nameList.add("Lokesh"); /* * reduce() terminal operation performs a reduction on the * elements of the stream with the given function. The result * is an Optional holding the reduced value. */ Optional<String> optional = nameList.stream() .reduce((s1, s2) -> s1 + "#" + s2); optional.ifPresent(System.out::println); } }Output
Amitabh#Shekhar#Aman#Rahul#Shahrukh#Salman#Yana#LokeshClick the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_terminal_op_examples_App.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_terminal_op_examples_App
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/bc0205890e206d66c03b068b168e05c78f68f50d/BasicJava/StreamDemo_terminal_op_examples_App/?at=master
See also:
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