java3 lesson1 v1.0 2020-01-30 22-59

java3/lesson1/src/main/java/javacore/lesson1/Tests.java

@@ -5,6 +5,7 @@
  */
 package javacore.lesson1;
 
+import javacore.lesson1.task4.Task4;
 import javacore.lesson1.task3.Task3;
 
 /**
@@ -19,5 +20,7 @@ public static void main(String[] args) {
         task2.test();
         Task3 task3 = new Task3();
         task3.test();
+        Task4 task4 = new Task4();
+        task4.test();
     }
 }

java3/lesson1/src/main/java/javacore/lesson1/task3/Box.java

@@ -29,9 +29,18 @@ public float getWeight() {
         }
         return resultWeight;
     }
-    public boolean compare(Box<T> anotherBox) {
+    public ArrayList<T> getFruits() {
+        return this.fruits;
+    }
+    public boolean compare(Box anotherBox) {
         return this.getWeight() == anotherBox.getWeight() ? true : false; 
     }
+    public void putTo(Box anotherBox) {
+        if (anotherBox.getFruits().isEmpty()) {
+            anotherBox.getFruits().addAll(this.getFruits());
+            this.getFruits().clear();
+        }
+    }
     @Override
     public String toString() {
         return this.fruits.toString();

java3/lesson1/src/main/java/javacore/lesson1/task3/Task3.java

@@ -37,6 +37,13 @@ public void test() {
 
         System.out.println("Compare boxOranges and boxApples - " + boxOranges.compare(boxApples));
 
+        Box boxFruit = new Box();
+        System.out.println("boxApples - " + boxApples);
+        System.out.println("boxFruit - " + boxFruit);        
+        boxApples.putTo(boxFruit);
+        System.out.println("boxApples - " + boxApples);
+        System.out.println("boxFruit - " + boxFruit);        
+
         System.out.println("--------------------------\n");
     }
 }

java3/lesson1/src/main/java/javacore/lesson1/Task4.java → java3/lesson1/src/main/java/javacore/lesson1/task4/Lambda.java

@@ -3,12 +3,12 @@
  * To change this template file, choose Tools | Templates
  * and open the template in the editor.
  */
-package javacore.lesson1;
+package javacore.lesson1.task4;
 
 /**
  *
  * @author igor
  */
-public class Task4 {
-
+public interface Lambda {
+    int calculate(int a, int b);
 }

java3/lesson1/src/main/java/javacore/lesson1/task4/Task4.java

@@ -0,0 +1,21 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1.task4;
+
+/**
+ *
+ * @author igor
+ */
+public class Task4 {
+    public void test() {
+        Lambda lambdaSum = (x, y) -> x + y;
+        System.out.println("Лямбда для суммы: " + lambdaSum.calculate(20, 5));
+        Lambda lambdaDiv = (x, y) -> x / y;
+        System.out.println("Лямбда для деления: " + lambdaDiv.calculate(20, 5));
+        Lambda lambdaMul = (x, y) -> x * y;
+        System.out.println("Лямбда для умножения: " + lambdaMul.calculate(20, 5));
+    }
+}