#8 - Java

Author: Josegs95

Roadmap/08 - CLASES/java/Josegs95.java

@@ -0,0 +1,172 @@
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+public class Josegs95 {
+    public static void main(String[] args) {
+        //Clases
+        Persona p1 = new Persona("Jose", 29); //Crea un objeto 'p1' de la clase persona
+        Persona p2 = new Persona("María", 27);
+        Persona p3 = new Persona("Alberto", 41);
+
+        System.out.println("p1: " + p1); //Out: 'p1: Nombre: Jose, edad: 29 años.'
+        System.out.println("p2: " + p2); //Out: 'p2: Nombre: María, edad: 27 años.'
+        System.out.println("p3: " + p3); //Out: 'p3: Nombre: Alberto, edad: 41 años.'
+
+        p3.setName("Juan Alberto");
+
+        System.out.println("p3: " + p3); //Out: 'p3: Nombre: Juan Alberto, edad: 41 años.'
+
+        //Reto
+        System.out.println("\n");
+        retoFinal();
+    }
+
+    public static void retoFinal(){
+        //Pila
+        My_Stack<String> stack = new My_Stack<>();
+        System.out.println(stack); //Out: 'Stack: []'
+
+        stack.push("Element 1");
+        stack.push("Element 2");
+        stack.push("Element 3");
+        stack.print(); //Out: '[Element 3] [Element 2] [Element 1]'
+        System.out.println(stack); //Out: 'Stack: [Element 1, Element 2, Element 3]'
+
+        System.out.println(stack.pop()); //Out: 'Element 3'
+        stack.print(); //Out: '[Element 2] [Element 1]'
+        System.out.println(stack); //Out: 'Stack: [Element 1, Element 2]'
+
+        System.out.println("\n\n");
+        //Cola
+        My_Queue<String> queue = new My_Queue<>();
+        System.out.println(queue); //Out: 'Queue: []'
+
+        queue.add("Element 1");
+        queue.add("Element 2");
+        queue.add("Element 3");
+        queue.print(); //Out: '[Element 1] [Element 2] [Element 3]'
+        System.out.println(queue); //Out: 'Queue: [Element 1, Element 2, Element 3]'
+
+        System.out.println(queue.poll()); //Out: 'Element 1'
+        queue.print(); //Out: '[Element 2] [Element 3]'
+        System.out.println(queue); //Out: 'Queue: [Element 2, Element 3]'
+    }
+
+    public static class Persona{
+        private String name;
+        private int age;
+
+        Persona(String name, int age){
+            this.name = name;
+            this.age = age;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public int getAge() {
+            return age;
+        }
+
+        public void setAge(int age) {
+            this.age = age;
+        }
+
+        @Override
+        public String toString(){
+            return "Nombre: " + name + ", edad: " + age + " años.";
+        }
+    }
+
+    //Reto
+    public static class My_Stack<E>{
+        List<E> elements;
+
+        public  My_Stack(Collection<E> collection){
+            if (collection == null)
+                elements = new ArrayList<>();
+            else
+                elements = new ArrayList<>(collection);
+        }
+        public My_Stack(){
+            this(null);
+        }
+
+        public E push(E element){
+            elements.add(element);
+            return element;
+        }
+
+        public E pop(){
+            if (size() == 0)
+                return null;
+
+            return elements.remove(size() - 1);
+        }
+
+        public int size(){
+            return elements.size();
+        }
+
+        public void print(){
+            List<E> cloneList = new ArrayList<>(elements);
+            Collections.reverse(cloneList);
+            for (E element : cloneList)
+                System.out.print("[" + element + "] ");
+            System.out.println();
+        }
+
+        @Override
+        public String toString() {
+            return "Stack: " + elements.toString();
+        }
+    }
+
+    public static class My_Queue<E>{
+        List<E> elements;
+
+        public  My_Queue(Collection<E> collection){
+            if (collection == null)
+                elements = new ArrayList<>();
+            else
+                elements = new ArrayList<>(collection);
+        }
+        public My_Queue(){
+            this(null);
+        }
+
+        public E add(E element){
+            elements.add(element);
+            return element;
+        }
+
+        public E poll(){
+            if (size() == 0)
+                return null;
+
+            return elements.remove(0);
+        }
+
+        public int size(){
+            return elements.size();
+        }
+
+        public void print(){
+            for (E element : elements)
+                System.out.print("[" + element + "] ");
+            System.out.println();
+        }
+
+        @Override
+        public String toString() {
+            return "Queue: " + elements.toString();
+        }
+    }
+}