Java Codes Basic to Advance

//13 Syntax:Exception handling 03

public class Main {
  public static void main(String[ ] args) {
  throw new ArithmeticException("Access denied ");
  }
//No Output only a error Msg will be shown
}

//13 Syntax:Exception handling 02

public class Main {
  public static void main(String[ ] args) {
  try {
    int[] myNumbers = {1, 2, 3};
    System.out.println(myNumbers[10]);
  } catch (Exception e) {
    System.out.println("Oh No...");
  } finally {
    System.out.println("I will run whatever happen.");
  }
  }
}

//13 Syntax:Exception handling

public class Main {
  public static void main(String[ ] args) {
  try {
    int[] myNumbers = {1, 2, 3};
    System.out.println(myNumbers[10]);
  } catch (Exception e) {
    System.out.println("Oh No...");
  }
  }
}

//12 Syntax:user input

import java.util.Scanner;

class Main {
  public static void main(String[] args) {
  Scanner Obj = new Scanner(System.in);

  System.out.println("Enter name, age and salary:");
  String name = Obj.nextLine();
  int age = Obj.nextInt();
  double salary = Obj.nextDouble();
  System.out.println("Name: " + name);
  System.out.println("Age: " + age);
  System.out.println("Salary: " + salary);
  }
}

//11 Syntax:Enums

public class Main {
  public static void main(String[] args) {
  Level myVar = Level.Mid;
  System.out.println(myVar);
  }

  enum Level {
  Max,
  Mid,
  Min
  }
}

//10 Syntax:OOPS:Encapsulation

public class Person {
  public static void main(String[] args) {
  Person myObj = new Person();
  myObj.setName("John"); // Set the value of the name variable to "John"
  System.out.println(myObj.getName());
  }

  private String name; // private = restricted access
  // Getter
  public String getName() {
  return name;
  }
  // Setter
  public void setName(String newName) {
  this.name = newName;
  }
}

//10 Syntax:OOPS:Class Constructors

public class Main {
  public static void main(String[] args) {
  Main myCar = new Main(1969, "Mustang");
  System.out.println(myCar.modelYear + " " + myCar.modelName);
  }

  int modelYear;
  String modelName;

  public Main(int year, String name) {
  modelYear = year;
  modelName = name;
  }

}

//10 Syntax:OOPS:Class methods

public class Main {
  public static void main(String[] args) {
  myStaticMethod(); // Call the static method
  Main myObj = new Main(); // Create an object of Main
  myObj.myPublicMethod(); // Call the public method on the object
  }

  static void myStaticMethod() {
  System.out.println("Static methods can be called without creating objects");
  }
  public void myPublicMethod() {
  System.out.println("Public methods must be called by creating objects");
  }
}

//10 Syntax:OOPS:Class and Obj

public class Java_C_O{
  public static void main(String[] args){
     Java_C_O obj1 = new Java_C_O();
     Java_C_O obj2 = new Java_C_O();
     System.out.println(obj1.x);
     System.out.println(obj2.y);
  }
 int x = 5, y=10;
}

//09 Syntax:Method/Function:Recursion

public class Fibonnaci{
  public static void main(String[] args){
     int N=10;
     System.out.print(n1+","+n2);
     pfibonnaci(N-2);
  }
    static int n1=0,n2=1,ns;
  static void pfibonnaci(int N){
      if(N>0){
          ns=n1+n2;
          n1=n2;
          n2=ns;
          System.out.print(","+ns);
          pfibonnaci(N-1);
      }
}
}

//09 Syntax:Method/Function:Overloading

public class Overloading {
  public static void main(String[] args) {
  System.out.println(plusMethod(6, 8));
  System.out.println(plusMethod(4.3, 9.2));
  }
static int plusMethod(int x, int y) {
  return x + y;
}
  static double plusMethod(double x, double y) {
  return x + y;
}
}

//09 Syntax:Method/Function:parameters// if-else

public class Parameters {
  public static void main(String[] args) {
  checkAge(20);
  }
static void checkAge(int age) {
  if (age < 18) {
      System.out.println("Noty Ho raha B**** ke L****");
  } else {
    System.out.println("kunDi mat khaDkao raja seedha andar aao raja..");
  }
  }
}

//09 Syntax:Method/Function:parameters// return value

public class Parameters {
public static void main(String[] args) {
  System.out.println(myMethod(5, 3));
  }
static int myMethod(int x, int y) {
  return x + y;
  }
}

//09 Syntax:Method/Function:parameters// return value

public class Parameters {
  public static void main(String[] args) {
  System.out.println(myMethod(3));
  }
 static int myMethod(int x) {
  return 5 + x;
  }
}

//09 Syntax:Method/Function:parameters

public class Parameters {
  public static void main(String[] args) {
  fun1("Liam", 5);
  fun1("Jenny", 8);
  fun1("Anja", 31);
  }
 static void fun1(String fname, int age) {
  System.out.println(fname + " is " + age);
  }
}

//09 Syntax:Method/Function

public class Method_Fuction {
  public static void main(String[] args) {
  Print();
  }
//Method
 static void Print() {
  System.out.println("I just got executed!");
  }
}

.

// 08 Syntax:Multi dimensional array

public class Array_multi{
  public static void main(String[] args) {
  int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };
  for (int i = 0; i < myNumbers.length; ++i) {
    for(int j = 0; j < myNumbers[i].length; ++j) {
      System.out.println(myNumbers[i][j]);
    }
  }
  }
}

//08 Syntax:Array length

public class Array_len{
  public static void main(String[] args) {
  String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};
  System.out.println(cars.length);
  }
}

//08 Syntax:Array

public class Array{
  public static void main(String[] args) {
  String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};
  System.out.println(cars[0]);
  cars[0] = "Suzuki";
  System.out.println("Value is changed \t" + cars[0]);
  }
}