Merge pull request #8931 from JuanGuzmanG/main

#00 - Java

Author: Roswell468

Roadmap/00 - SINTAXIS, VARIABLES, TIPOS DE DATOS Y HOLA MUNDO/java/JuanGuzmanG.java

@@ -0,0 +1,29 @@
+public class JuanGuzmanG {
+
+    public static void main(String args[]) {
+        //https://docs.oracle.com/en/java/index.html
+        
+        //tipos de comentarios
+        //una sola linea
+        /*
+        comentario de 
+        varias lineas
+        */
+        /**
+        comentario de Javadoc
+        */
+        
+        //variable y constante
+        int valor = 0;
+        final int constante = 100;
+        
+        //primitivos
+        boolean resultado = true;
+        char letra = 'C';
+        byte b = 100;
+        short s = 10000;
+        int i = 1000000000;
+ 
+        System.out.println("¡Hola, Java");
+    }
+}

Roadmap/01 - OPERADORES Y ESTRUCTURAS DE CONTROL/java/JuanGuzmanG.java

@@ -0,0 +1,125 @@
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class JuanGuzmanG {
+
+    public static void main(String args[]) {
+        //arithmetic
+        int additive = 1 + 1;
+        int subtraction = 1 - 1;
+        int multiplication = 1 * 1;
+        float division = 1 / 2;
+        float remainder = 1 / 2;
+        
+        /*
+        Unary
+        + indica valores positivos
+        - indica negativos
+        ++ incremente de 1 en 1
+        -- decrementa de 1 en 1
+
+        */
+        
+        //Operadores logicos
+        /*
+        || or
+        && and
+        ^ xor
+        */
+        
+        //operadores de comparación
+        /*
+        == igual a
+        != distinto
+        > mayor que
+        < menos que
+        => igual o mayor que
+        <= igual o menor que
+        */
+        
+        /*
+        = asignacion
+        += suma el valor asignado a la variable
+        -= resta el valor asignado a la variable
+        int b = 9;
+        b<<=3;
+        System.out.print(b);        
+        */
+        //condicionales
+        int condicion = 1;
+        if(condicion==1){
+            System.out.print(1);
+        } else if(condicion==2){
+            System.out.print(2);
+        } else{
+            System.out.print("mas de 2");
+        }
+        switch (condicion){
+            case 1 -> System.out.print(1);
+            case 2 -> System.out.print(2);
+        }
+        switch (condicion){
+            case 1 -> { 
+                System.out.println(1);
+                System.out.println("fin");
+            }
+        }
+        //iterativas
+        System.out.println("while:");
+        int count = 2;
+        while(count<3){
+            count+=1;
+            System.out.println("while: "+ count);
+        }
+        System.out.println("===============");
+        int countdo = 6;
+        do{
+            System.out.println("dowhile: "+ countdo);
+            countdo++;
+        }while(countdo<6);
+        
+        //for
+        System.out.println("for:");
+        int i;
+        for(i=0; i<2;i++){
+            System.out.println(i);
+        }
+        System.out.println("foreach:");
+        int[] numbers = {1,2,3,4,5};
+        for(int num : numbers){
+            System.out.println(num);
+            if(num == 3){
+                break;
+            }
+        }
+        
+        System.out.println("try catch:");
+        double trydivision;
+        try{
+            trydivision = 20/0;
+            System.out.println(trydivision);
+        } catch(ArithmeticException e){
+            System.out.println("no se puede dividir por 0");
+        } finally{
+            System.out.println("fin de division");
+        }
+         
+        System.out.println("dificultad extra");
+        List<Integer> lista = IntStream.rangeClosed(10, 55)
+                .boxed()
+                .collect(Collectors.toList());
+        for(Integer num : lista){
+            if (num % 2 == 0 && num != 16 && num % 3 != 0) {
+              System.out.println(num);
+            }
+        }
+        System.out.println("con streams");
+        IntStream.rangeClosed(10,55)
+                .filter(n -> n % 2 == 0)
+                .filter(n -> n % 3 != 0)
+                .filter(n -> n != 16)
+                .forEach(System.out::println);
+        
+    }
+}