Merge pull request #82 from sayed-moin-ahmed/develop

sayed-moin-ahmed · web-flow · commit 355cd31348d5 · 2021-03-08T18:21:42.000+05:30
Stream
diff --git a/src/main/java/com/java15/example/modern_java_in_action/Data.java b/src/main/java/com/java15/example/modern_java_in_action/Data.java
@@ -5,7 +5,7 @@
 import java.util.List;
 
 public class Data {
-    public static List<Apple> getData() {
+    public static List<Apple> getApples() {
         Apple apple1 = new Apple(10, Colors.GREEN);
         Apple apple2 = new Apple(1,Colors.RED);
         Apple apple3 = new Apple(5,Colors.GREEN);
@@ -16,7 +16,7 @@ public static List<Apple> getData() {
         return apples;
     }
 
-    public static List<Apple> getData1() {
+    public static List<Apple> getApples1() {
         Apple apple1 = new Apple(10,Colors.GREEN);
         Apple apple2 = new Apple(1,Colors.RED);
         Apple apple3 = new Apple(5,Colors.GREEN);
@@ -33,4 +33,15 @@ public static List<Apple> getData1() {
         apples.sort(Comparator.comparing(Apple::getWeight));
         return apples;
     }
+
+    public static List<Dish> getDishes(){
+        return  List.of(
+                new Dish(Type.INDIAN,"Pav Bhaji",50),
+                new Dish(Type.WESTERN,"Chicken Roast",250),
+                new Dish(Type.CHINESE,"Noodles",150),
+                new Dish(Type.INDIAN,"Bhaji",150),
+                new Dish(Type.WESTERN,"Lamb ",550),
+                new Dish(Type.CHINESE,"Prawn Noodles",250)
+        );
+    }
 }
diff --git a/src/main/java/com/java15/example/modern_java_in_action/Dish.java b/src/main/java/com/java15/example/modern_java_in_action/Dish.java
@@ -0,0 +1,49 @@
+package com.java15.example.modern_java_in_action;
+
+public class Dish {
+
+    private Type type;
+    private String name;
+    private int calories;
+
+    public Dish(){}
+
+    public Dish(Type type, String name, int calories) {
+        this.type = type;
+        this.name = name;
+        this.calories = calories;
+    }
+
+    public Type getType() {
+        return type;
+    }
+
+    public void setType(Type type) {
+        this.type = type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getCalories() {
+        return calories;
+    }
+
+    public void setCalories(int calories) {
+        this.calories = calories;
+    }
+
+    @Override
+    public String toString() {
+        return "Dish{" +
+                "type=" + type +
+                ", name='" + name + '\'' +
+                ", calories=" + calories +
+                '}';
+    }
+}
diff --git a/src/main/java/com/java15/example/modern_java_in_action/Type.java b/src/main/java/com/java15/example/modern_java_in_action/Type.java
@@ -0,0 +1,7 @@
+package com.java15.example.modern_java_in_action;
+
+public enum Type {
+        INDIAN,
+        WESTERN,
+        CHINESE;
+}
diff --git a/src/main/java/com/java15/example/modern_java_in_action/ch1_java8_9_10_11_whatshappening/Test.java b/src/main/java/com/java15/example/modern_java_in_action/ch1_java8_9_10_11_whatshappening/Test.java
@@ -13,7 +13,7 @@
 public class Test {
 
     public static void main(String[] args) {
-        List<Apple>  apples = Data.getData();
+        List<Apple>  apples = Data.getApples();
         //filterApples(apples,(Apple a) -> Colors.GREEN.equals(a.getColor())).stream().forEach(System.out::println);
         // filterApples(apples,(Apple a) -> Colors.GREEN.equals(a.getColor())).stream().forEach(System.out::println);
         // filterGroupApples(apples,(Apple a) -> Colors.RED.equals(a.getColor())).forEach((i,list) ->{System.out.println(i+""+list);});
diff --git a/src/main/java/com/java15/example/modern_java_in_action/ch2_passingcodewithbehaviorparameterization/Test.java b/src/main/java/com/java15/example/modern_java_in_action/ch2_passingcodewithbehaviorparameterization/Test.java
@@ -16,7 +16,7 @@
 
 public class Test {
     public static void main(String[] args) throws ExecutionException, InterruptedException {
-        List<Apple> apples = Data.getData();
+        List<Apple> apples = Data.getApples();
         // beforeJava8(apples);
         //filter(apples,(Apple e) -> Colors.GREEN.equals(e.getColor())).forEach(System.out::println);
         // groupBy(apples,apple -> apple.getWeight()).forEach((i, list)->System.out.println(i+""+list));
diff --git a/src/main/java/com/java15/example/modern_java_in_action/ch3_lambdaexpressions/Test.java b/src/main/java/com/java15/example/modern_java_in_action/ch3_lambdaexpressions/Test.java
@@ -46,8 +46,8 @@ private static void extracted8() {
     }
 
     private static void extracted7() {
-        Data.getData().stream().filter(notRedApple).forEach(System.out::println);
-        Data.getData().stream().filter(redAppleWithConditions).forEach(System.out::println);
+        Data.getApples().stream().filter(notRedApple).forEach(System.out::println);
+        Data.getApples().stream().filter(redAppleWithConditions).forEach(System.out::println);
     }
 
     static Predicate<Apple> redApple = apple -> Colors.RED.equals(apple.getColor());
@@ -56,7 +56,7 @@ private static void extracted7() {
 
 
     private static void extracted6() {
-        List<Apple> list = Data.getData1();
+        List<Apple> list = Data.getApples1();
         list.sort(comparing(Apple::getWeight).reversed());
         list.forEach(System.out::println);
         System.out.println("++++++++++++++++++++++++++++++");
diff --git a/src/main/java/com/java15/example/modern_java_in_action/ch4_introducingstreams/Test.java b/src/main/java/com/java15/example/modern_java_in_action/ch4_introducingstreams/Test.java
@@ -0,0 +1,32 @@
+package com.java15.example.modern_java_in_action.ch4_introducingstreams;
+
+import com.java15.example.modern_java_in_action.Data;
+import com.java15.example.modern_java_in_action.Dish;
+import com.java15.example.modern_java_in_action.Type;
+
+import java.util.List;
+import java.util.Map;
+
+import static java.util.stream.Collectors.groupingBy;
+
+public class Test {
+    public static void main(String[] args) {
+        List<Dish> dishes = Data.getDishes();
+       /* List<String> dishNames1 = dishes.stream()
+                .filter(dish -> dish.getCalories()>250)
+                .sorted(Comparator.comparing(Dish::getName))
+                .map(Dish::getName)
+                .collect(Collectors.toList());
+        dishNames1.forEach(System.out::println);
+
+        List<String> dishNames2 = dishes.parallelStream()
+                .filter(dish -> dish.getCalories()>50)
+                .sorted(Comparator.comparing(Dish::getName))
+                .map(Dish::getName)
+                .collect(Collectors.toList());
+        dishNames2.forEach(System.out::println);*/
+
+        Map<Type,List<Dish>> map = dishes.stream().collect(groupingBy(Dish::getType));
+        map.forEach((s,list)->System.out.println(s+""+list));
+    }
+}
