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Basic programs/checkNoisOddorEven.java

+import java.util.Scanner;
+
+// first method using if-else
+public class checkNoisOddorEven {
+
+    static public void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+
+        System.out.print("Enter a number:");
+        int val = input.nextInt();
+
+        if (val % 2 == 0) {
+            // if((val | 1) > val)
+            // if (val & 1 == 1)
+            System.out.println("No. is even");
+        }
+        else {
+            System.out.println("No. is odd");
+        }
+
+    }
+}

Basic programs/findFactorial.java

+public class findFactorial {
+    static public int printFactorial(int n) {
+        if(n==0) 
+            return 1;
+        
+        return n * printFactorial(n-1);
+    }
+    static public int printFactorialIterative(int n) {
+        int res = 1;
+        for(int i = 2; i <= n; i++ ) {
+            res = res*i;
+        }
+        return res;
+    }
+    public static void main(String[] args) {
+        int factVal = 6;
+        int x = printFactorial(factVal);
+        System.out.println("factorial of "+ factVal +" is "+ x);
+        System.out.println(printFactorialIterative(factVal));
+    }
+}

Basic programs/findLargestAmongThree.java

+public class findLargestAmongThree {
+    static int largestOfThree(int a, int b, int c) {
+        // return Math.max(a, Math.max(b, c));
+        return a>b?(a>c?a:c):(b>c?b:c);
+    }
+    public static void main(String[] args) {
+        int a = 2;
+        int b = 5;
+        int c = 4;
+        int largest = 0;
+        if (a > b) {
+            largest = a;
+        } else if (b > c) {
+            largest = b;
+        } else {
+            largest = c;
+        }
+        System.out.println("Largest among three numbers is: " + largest);
+        System.out.println("Largest among three numbers is: " + largestOfThree(a, b, c));
+    }    
+}

Basic programs/helloworld.java

+public class helloworld {
+    public static void main(String[] arge) {
+        System.out.println("Hello, World!");
+    }
+}

Basic programs/isLeapYear.java

+public class isLeapYear {
+    public static void main(String[] args) {
+        int year = 2020;
+        if (year % 4 == 0) {
+            System.out.println("Leap Year");
+        } else {
+            System.out.println("Not a Leap Year");
+        }
+    }
+}

Basic programs/multiply.java

+// java program to multiply two floating nos.
+
+public class multiply {
+    public static void main(String[] args) {
+        float a = 2.5f;
+        float b = 3.5f;
+
+        float c = a * b;
+        
+        System.out.println(c);
+    }
+}

Basic programs/readInput.java

+import java.util.Scanner;
+
+public class readInput {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.print("Enter a number:");
+        int val = input.nextInt();
+        System.out.println(val);
+    }
+}

Basic programs/swapNo.java

+// public class swapNo {
+//     public static void main(String[] args) {
+//         int a = 2;
+//         int b = 3;
+//         int temp;
+//         System.out.println("values of a and b before swaping: ");
+//         System.out.println("a: "+ a);
+//         System.out.println("b: "+ b);
+//         temp = a;
+//         a = b;
+//         b = temp;
+//         System.out.println("values of a and b after swaping: ");
+//         System.out.println("a:"+ a);
+//         System.out.println("b:"+ b);
+//     }
+// }
+
+// we will make seprate function for swapping
+
+public class swapNo {
+
+    // static void swapValues(int a, int b) {
+    //     int temp;
+    //     temp = a;
+    //     a = b;
+    //     b = temp;
+    //     swapValues(a, b);
+    //     System.out.println("values of a and b after swaping:");
+    //     System.out.println("a: " + a);
+    //     System.out.println("b: " + b);
+    // }
+    static void swapWithoutTemp(int a, int b) {
+        a = a * b;
+        b = a / b;
+        a = a / b;
+        System.out.println("values of a and b after swaping:");
+        System.out.println("a: " + a);
+        System.out.println("b: " + b);
+    }
+    public static void main(String[] args) {
+        int a = 3;
+        int b = 8;
+        // swapValues(a, b);
+        swapWithoutTemp(a, b);
+    }
+}
\ No newline at end of file

Basic programs/vowelOrConsonent.java

+public class vowelOrConsonent {
+    public static void vowel_or_consonent(char y) {
+        if (y == 'a' || y == 'e' || y == 'i' || y =='o' || y == 'u') {
+            System.out.println("It is vowel");
+        } else {
+            System.out.println("It is consonent");
+        }
+    }
+    public static void main(String[] args) {
+        vowel_or_consonent('b');
+    }
+}