Java Codes Basic to Advance

//07 Syntax:For Each loop

public class For_each_loop{
  public static void main(String[] args) {
  String[] alpha = {"A", "B", "C", "D", "E", "F"};
  for (String i : alpha) {
     System.out.println(i);
  }
  }
}

//06 Syntax: Switch

public class Switch_day{
  public static void main(String[] args) {
   int day = 4;
  switch (day) {
  case 1:
    System.out.println("Monday");
    break;
  case 2:
    System.out.println("Tuesday");
    break;
  case 3:
    System.out.println("Wednesday");
    break;
  case 4:
    System.out.println("Thursday");
    break;
  case 5:
    System.out.println("Friday");
    break;
  case 6:
    System.out.println("Saturday");
    break;
  case 7:
    System.out.println("Sunday");
    break;
  }
  }
}

// 05 Syntax:Short hand if else

public class Time{
  public static void main(String[] args) {
   int time = 20;
   String result = (time < 18) ? "Good day." : "Good evening.";
   System.out.println(result);
  }
}

//05 Syntax:Else If

public class Time{
  public static void main(String[] args) {
   int time = 16;
   if (time < 12) {
   System.out.println("Good morning.");
   } else if (time <= 15) {
   System.out.println("Good day.");
   } else {
  System.out.println("Good evening.");
  }
  }
}

//04 Syntax:String 04

public class String_con{
  public static void main(String[] args) {
   String firstName = "Jack ";
   String lastName = "Ingof";
   System.out.println(firstName.concat(lastName));
  }
}

// 04 Syntax:String 03

public class String_loc{
  public static void main(String[] args) {
   String txt = "Find me where Am I";
   System.out.println(txt.indexOf("Am"));
  }
}

// 04 Syntax:String 02

public class String_case{
  public static void main(String[] args) {
   String txt = "Hello World";
  System.out.println(txt.toUpperCase());
  System.out.println(txt.toLowerCase());
  }
}

// 04 Syntax:String

public class String_length {
  public static void main(String[] args) {
   String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
   System.out.println("The length of the txt string is: " + txt.length());
  }
}

//03 Syntax:Basic 02

public class Type_Casting {
  public static void main(String[] args) {
  double myDouble = 9.256d;
  int myInt = (int) myDouble; // Manual casting: double to int
  System.out.println(myDouble);    
  System.out.println(myInt);
  }
}

//03 Syntax:Basic 01

public class Type_Casting {
  public static void main(String[] args) {
   int myInt = 9;
  double myDouble = myInt; // Automatic casting: int to double
  System.out.println(myInt);    
  System.out.println(myDouble);
  }
}

//02 Syntax:Basic 04

public class Variables {
  public static void main(String[] args) {
   char Var1 = 65, Var2 = 66, Var3 = 67;
   System.out.println(Var1);
   System.out.println(Var2);
   System.out.println(Var3);
   //Character of ASCII
  }
}

//02 Syntax:Basic 03

public class Variables {
  public static void main(String[] args) {
   float f1 = 35e3f;
   double d1 = 12E4d;
//e or E represent scientific Number
   System.out.println(f1);
   System.out.println(d1);
  }
}

//02 Syntax:Basic

public class Variables {
  public static void main(String[] args) {
   int Num = 5;
   float FloatNum = 5.99f;
   char Letter = 'D';
   boolean Bool = true;
   String Text = "Hello";
   
  System.out.println(Num);
  System.out.println(FloatNum);
  System.out.println(Letter);
  System.out.println(Bool);
  System.out.println(Text);
  }
}

//01 Syntax:Basic 02

public class Hello_World {
  public static void main(String[] args) {
  System.out.print("1");//Same line
  System.out.println("2");// add new line
  System.out.println("3");
  }
}

//01 Syntax:Basic

public class Hello_World {
  public static void main(String[] args) {
  System.out.println("Hello World");
  }
}

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// Remove duplicates from array

import java.util.Arrays;
import java.util.LinkedHashSet;

public class RemoveDuplicates {
    public static void main(String[] args) {
        Integer[] arrayWithDuplicates = {1, 2, 3, 3, 4, 5, 5, 6};
        
        // Convert array to LinkedHashSet to remove duplicates while preserving order
        LinkedHashSet<Integer> set = new LinkedHashSet<>(Arrays.asList(arrayWithDuplicates));
        
        // Convert back to array
        Integer[] arrayWithoutDuplicates = set.toArray(new Integer[0]);
        
        // Print array without duplicates
        System.out.println(Arrays.toString(arrayWithoutDuplicates));
    }
}

//Even odd using if else in java

public class Main {
    public static void main(String[] args) {
        int num = 4;
        if( num % 2 == 0){
            System.out.println("Number is Even");
        }
        else{
            System.out.println("Nunber is Odd");
        }
    }
}

//multiply two numbers in Java

public class Main {
    public static void main(String[] args) {
     
        int num1 = 6;
    
        int num2 = 5;

        int product = num1 * num2;

        System.out.println("product is: " + product);
        
    }
}

//sum two numbers in Java

public class Main {
    public static void main(String[] args) {
        int num1 = 5; // First number
        int num2 = 7; // Second number

        int sum = num1 + num2; // Adding the two numbers

        System.out.println("Sum is: " + sum); // Printing the sum
    }
}