Streams

Streams

Author: KnowGroup

nbproject/build-impl.xml

@@ -1,8 +1,8 @@
 build.xml.data.CRC32=53a7d579
 build.xml.script.CRC32=c6b5575f
-build.xml.stylesheet.CRC32=8064a381@1.79.1.48
+build.xml.stylesheet.CRC32=f85dc8f2@1.90.1.48
 # This file is used by a NetBeans-based IDE to track changes in generated files such as build-impl.xml.
 # Do not edit this file. You may delete it but then the IDE will never regenerate such files for you.
 nbproject/build-impl.xml.data.CRC32=53a7d579
-nbproject/build-impl.xml.script.CRC32=3066fa53
-nbproject/build-impl.xml.stylesheet.CRC32=05530350@1.79.1.48
+nbproject/build-impl.xml.script.CRC32=f390ffbe
+nbproject/build-impl.xml.stylesheet.CRC32=3a2fa800@1.90.1.48

nbproject/genfiles.properties

@@ -3,4 +3,4 @@ do.depend=false
 do.jar=true
 javac.debug=true
 javadoc.preview=true
-user.properties.file=C:\\Users\\manbhakr\\AppData\\Roaming\\NetBeans\\8.1\\build.properties
+user.properties.file=C:\\Users\\manbhakr\\AppData\\Roaming\\NetBeans\\10.0\\build.properties

nbproject/private/private.properties

@@ -19,8 +19,12 @@ build.test.results.dir=${build.dir}/test/results
 #debug.transport=dt_socket
 debug.classpath=\
     ${run.classpath}
+debug.modulepath=\
+    ${run.modulepath}
 debug.test.classpath=\
     ${run.test.classpath}
+debug.test.modulepath=\
+    ${run.test.modulepath}
 # Files in build.classes.dir which should be excluded from distribution jar
 dist.archive.excludes=
 # This directory is removed when the project is cleaned:
@@ -36,13 +40,17 @@ javac.classpath=
 javac.compilerargs=
 javac.deprecation=false
 javac.external.vm=true
+javac.modulepath=
+javac.processormodulepath=
 javac.processorpath=\
     ${javac.classpath}
 javac.source=1.8
 javac.target=1.8
 javac.test.classpath=\
     ${javac.classpath}:\
     ${build.classes.dir}
+javac.test.modulepath=\
+    ${javac.modulepath}
 javac.test.processorpath=\
     ${javac.test.classpath}
 javadoc.additionalparam=
@@ -68,9 +76,13 @@ run.classpath=\
 # You may also define separate properties like run-sys-prop.name=value instead of -Dname=value.
 # To set system properties for unit tests define test-sys-prop.name=value:
 run.jvmargs=
+run.modulepath=\
+    ${javac.modulepath}
 run.test.classpath=\
     ${javac.test.classpath}:\
     ${build.test.classes.dir}
+run.test.modulepath=\
+    ${javac.test.modulepath}
 source.encoding=UTF-8
 src.dir=src
 test.src.dir=test

nbproject/project.properties

@@ -0,0 +1,31 @@
+package com.know.streams;
+
+import com.know.util.DataUtil;
+import com.know.util.Utility;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Steam configuration can be done by filter and map operation
+ * @author KnowGroup
+ */
+public class Lesson_01_Stream_Configuration_filter_map {
+ 
+    public static void main(String[] arg){
+        /*
+            filter | elements based on a given predicate
+        */
+        List<Integer> collect = 
+                DataUtil.fibbinacos().stream().filter(n->n%2==0).collect(Collectors.toList());
+        collect.stream().forEach(System.out::println);
+        
+        Utility.log("============");
+        
+        /*
+            map | elements to another form defined in a function
+         */
+        List<Integer> mapped = 
+                DataUtil.fibbinacos().stream().map(n->n*n).collect(Collectors.toList());
+        mapped.stream().forEach(System.out::println);
+    }
+}

src/com/know/streams/Lesson_01_Stream_Configuration_filter_map.java

@@ -0,0 +1,24 @@
+package com.know.streams;
+
+import com.know.util.DataUtil;
+import static com.know.util.DataUtil.*;
+import static com.know.util.Utility.*;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ *
+ * @author KnowGroup
+ */
+public class Lesson_02_Stream_Processing {
+
+    public static void main(String[] arg){
+       
+        /*
+        collect | element to a give Collector
+         */
+        //log(otp());
+        Set<Integer> collect = DataUtil.fibbinacos().stream().collect(Collectors.toSet());
+       
+    }
+}

src/com/know/streams/Lesson_02_Stream_Processing.java

@@ -0,0 +1,35 @@
+package com.know.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ *
+ * @author KnowGroup
+ */
+public class DataUtil {
+
+    public static List<Integer> fibbinacos(){
+        List<Integer> result = new ArrayList<>();
+            result.add(1);
+            result.add(2);
+            result.add(3);
+            result.add(5);
+            result.add(8);
+            result.add(13);
+            result.add(21);
+            result.add(34);
+            result.add(55);
+            result.add(89);
+            result.add(134);
+        return result;
+    }
+    
+    public static String otp(){
+        final StringBuilder o = new StringBuilder();
+        for(int i = 0 ; i < 6 ;i++){
+            o.append((int)(Math.random()*10));
+        }
+        return o.toString();
+    }
+}