assignment 2

session-02-big-picture/student-notes-repos.md

@@ -21,3 +21,4 @@
 - https://github.com/Raj04/Spring-Bootcamp
 - https://github.com/shawchandankumar/Java-Backend-Development
 - https://github.com/bogdanbilcan/JavaBrains-BootCampNotes
+- https://github.com/sahilpandith/java-backend-bootcamp/blob/main/README.md

session-03-java-basics/README.md

@@ -3,6 +3,29 @@
 ## Contents
 ### Basic Syntax: 
 Explains the basic syntax of the Java programming language, including how to declare variables, use control structures, and perform input/output operations.
+
+public class Main {
+    public static void main(String[] args){
+      //variable declaration
+        int i =0;
+        String s = "str"; 
+
+        if(i==0) {
+             System.out.println(i)
+        }
+    }
+}
+There are two types of variable declaration in java
+    1) Primitives : These are immutable.
+                        1. int
+                        2. double
+                        3. float
+                        4. long
+                        5. boolean
+                        6. short
+                        7. byte
+                        8. chat
+
 ### Data Types: 
 Explains the different data types in Java, including primitive types (such as int, double, and boolean) and non-primitive types (such as Strings).
 ### Operators: 

session-03-java-basics/java-basics-exercises/src/main/java/io/javabrains/javabasics/A.java

@@ -0,0 +1,10 @@
+package io.javabrains.javabasics;
+
+public class A {
+    String var = "string";
+    private String privateVar = "privateString";
+    protected String protectedVar = "protectedString";
+
+    public  String publicVar = "publicString";
+
+}

session-03-java-basics/java-basics-exercises/src/main/java/io/javabrains/javabasics/AnonymousInnerClasses.java

@@ -5,8 +5,29 @@
 Create an anonymous inner class implementation of `Animal2` and then call the `makeSound` method
  */
 
+abstract class Animal2{
+    abstract void makesound();
+}
 public class AnonymousInnerClasses {
     public static void main(String[] args) {
+        Animal2 cat = new Animal2(){
+           @Override
+            public void makesound(){
+                System.out.println("meow");
+
+            }
+        };
+        cat.makesound();
+
+        Animal2 dog = new Animal2(){
+            @Override
+            public void makesound(){
+                System.out.println("bow");
+
+            }
+        };
+        dog.makesound();
+
 
     }
 }

session-03-java-basics/java-basics-exercises/src/main/java/io/javabrains/javabasics/ArrayChallenge.java

@@ -1,12 +1,31 @@
 package io.javabrains.javabasics;
 
+import java.util.Arrays;
+
 public class ArrayChallenge {
     public static void main(String[] args) {
         // Step 1: Create an array of integers
-
+            int[] arr = {10,20,33,10};
 
         // Step 2: Use arrays and array operations to find the sum, average, and largest number in the array
+            int sum = 0;
+            double avg;
+            int largest =arr[0];
+            for (int i :arr){
+                sum+=i;
+                if(i>largest){
+                    largest =i; 
+                }
+            }
+            avg = sum / arr.length;
 
+        System.out.println("sum = " + sum);
+        System.out.println("avg = " + avg);
+        System.out.println("largest = " + largest);
+        int[] arrCopy = new int[3] ;
+        System.arraycopy(arr,1,arrCopy,0,3);
+        System.out.println("arrCopy = " + Arrays.toString(arrCopy));
+        System.out.println("arr = " + Arrays.toString(arr));
 
     }
 }

session-03-java-basics/java-basics-exercises/src/main/java/io/javabrains/javabasics/Assigments.java

@@ -0,0 +1,159 @@
+package io.javabrains.javabasics;
+
+import org.w3c.dom.css.Rect;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Scanner;
+
+
+public class Assigments {
+
+    public static void main(String[] args) throws IOException {
+
+        // Assignment1
+        Scanner scanner = new Scanner(System.in);
+        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
+
+//
+//        System.out.println("Enter first number");
+//        double num1 = Double.parseDouble(scanner.nextLine());
+//
+//        System.out.println("Enter second number");
+//        double num2 = Double.parseDouble(bufferedReader.readLine());
+//
+//
+//        System.out.println("sum " +  (num1+num2));
+//        System.out.println("sub " +  (num1-num2));
+//        System.out.println("product " +  (num1*num2));
+//        System.out.println("quotient " +  (num1/num2));
+//
+//
+//        //assognemtn2
+//
+//        System.out.println("Enter name");
+//        String name = scanner.nextLine();
+//        System.out.println("Enter age");
+//        int age = Integer.parseInt(bufferedReader.readLine());
+//        System.out.println("Enter salary");
+//        double salary = Double.parseDouble(scanner.nextLine());
+//
+//        System.out.println("name = " + name);
+//        System.out.println("age = " + age);
+//        System.out.println("salary = " + salary);
+//
+//
+//        //assignemt 3
+//
+//        if(num1==0){
+//            System.out.println("zero");
+//        }else if (num1>0){
+//            System.out.println("positive");
+//        }else {
+//            System.out.println("negative");
+//        }
+//
+//
+//        //Assignent 4
+//        System.out.println("enter the size of array");
+//        int length = Integer.parseInt(scanner.nextLine());
+//
+//        ArrayList<Integer> list = new ArrayList<Integer>();
+////        Integer[] list = {};
+//        for (int i =0; i<length;i++){
+//            System.out.println("Enter Element " + i );
+//            list.add(Integer.parseInt(scanner.nextLine()));
+//        }
+//
+//        System.out.println(list);
+//
+
+
+        //Assignemnt 5
+
+//        System.out.println("Enter a string");
+//        String str = scanner.nextLine();
+//
+//        ArrayList<Character> vowels = new ArrayList<>();
+//        vowels.add('a');
+//        vowels.add('e');
+//        vowels.add('i');
+//        vowels.add('o');
+//        vowels.add('u');
+//        int count=0;
+//        for(char c : str.toCharArray()){
+//            if(vowels.contains(Character.toLowerCase(c))){
+//                count++;
+//            }
+//        }
+//
+//        System.out.println("count = " + count);
+//
+//
+//        scanner.close();
+//        bufferedReader.close();
+//
+
+        // Assignment 6
+        Rectangle1 rect = new Rectangle1(12,23);
+        System.out.println(rect.calculateArea());
+
+        //Assignment 6
+        Animal1 loin = new Lion1("timothy",178,21);
+        Animal1 cow = new Cow("jersey",154,20);
+
+        loin.feed();;
+        cow.feed();
+    }
+}
+
+class Rectangle1{
+    int height;
+    int width;
+   Rectangle1(int height,int width){
+        this.height = height;
+        this.width = width;
+    }
+
+    public int calculateArea(){
+       return  this.height* this.width;
+    }
+}
+
+class  Animal1 {
+    String name;
+    double weight;
+    int age;
+    Animal1(String name,double weight,int age){
+        this.name = name;
+        this.weight = weight;
+        this.age = age;
+    }
+    public  void  feed(){
+        System.out.println("Animal eats food");
+    }
+}
+
+class Lion1 extends Animal1{
+    Lion1(String name,double weight, int age){
+        super(name,weight,age);
+    }
+    public void feed(){
+        System.out.println("Loin eats meat");
+    }
+
+}
+
+class Cow extends Animal1{
+    Cow(String name,double weight, int age){
+        super(name,weight,age);
+    }
+    public void feed(){
+        System.out.println("Cow eats grass");
+    }
+
+
+}

session-03-java-basics/java-basics-exercises/src/main/java/io/javabrains/javabasics/B.java

@@ -0,0 +1,17 @@
+package io.javabrains.javabasics;
+
+class B {
+    public void accessVars(){
+        A a =  new A();
+//        System.out.println("a.privateVar = " + a.privateVar); // can't perform this since it is private var
+        System.out.println("a.var = " + a.var);
+        System.out.println("a.protectedVar = " + a.protectedVar);
+        System.out.println("a.publicVar = " + a.publicVar);
+    }
+    public static void main(String[] args) {
+        B b = new B();
+        b.accessVars();
+    }
+}
+
+