Java Invent: March 2022

Replacing character in a String

import java.util.*;

public class ReplaceCharInString{
    public static void main(String args[]){
        String s = "xoxoxoxoxox";
        System.out.println(s.replace('x', 'X'));
        
        
    }
}

Printing the given string in uppercase

public class PrintToUpperCase{

    public static void main(String args[]){
        String s = "I LOVE My Country And Its People";

        System.out.println(s.toUpperCase());
    }
}

Printing the given string to lowercase

public class PrintToLowerCase{

    public static void main(String args[]){
        String s = "I LOVE My Country And Its People";

        System.out.println(s.toLowerCase());
    }
}

Print substring of a String

public class PrintSubString{

    public static void main(String args[]){
        String s = "corejavacourse";

        System.out.println(s.substring(5)); // from 5th character to end of of the string will print
        System.out.println(s.substring(5,8)); //only three character will print i.e 5,6,7... 
    }
}

Are Strings equal

public class IsStringEqual {

  public static void main(String args[]) {
    String s = "Haryana";

    System.out.println(s.length());

    System.out.println(s.equalsIgnoreCase("HARYANA"));
    System.out.println(s.equals("HARYANA"));
    System.out.println(s.equals("Haryana"));


    System.out.println(s.equalsIgnoreCase("States"));
  }
}

Concatenating and printing a String

import java.util.*;

public class ConcatenateStrings {
    public static void main(String args[]) {
        String str1 = "My name is";
        String str2 = "Sudeep Kumar Bondwal";

        String str3 = str1.concat(str2);
        System.out.println(str3);
    }
}

Concatenating a String

public class ConcateString1{

    public static void main(String args []){
        String s = "Haryana";
        s += " State";
        
        System.out.println(s);

    }
}

Concatenating a String

public class ConcateString{

    public static void main(String args []){
        String s = "Author";
        
        System.out.println(s.concat(" Book"));

    }
}

String to Int conversion using valueOf Method

public class StringToIntConversion1{

    public static void main(String args[]){
        String s = "200";
        int i = Integer.valueOf(s);

       System.out.println(i);
    }
}

Counting factor of a number between two specific numbers

import java.util.*;

class PrintNoFactor{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int counter=0;
        for(int i=a; i<=b; i++){
            if(i%c == 0){
                counter++;
            }
        }
        System.out.println(counter);
    }
}

Finding a palindromic number

import java.util.*;

public class TestPalindrome{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter any number to check");
        int n = sc.nextInt();
        isPalindrome(n);
       
    }

    public static void isPalindrome(int n){
        int temp =0;
        int remainder = 0;
        int sum =0;
        temp = n;
        while(n>0){
            remainder=n%10;
            sum = (sum*10)+remainder;
            n = n/10;
        }
        if(sum == temp){
            System.out.println("This is a palindromic number");
        } else{
            System.out.println("This is not a palindromic number");
        }
    }
}

Finding prime number using square root method

import java.util.*;

public class PrintPrimeNo{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a number");
        int n = sc.nextInt();
        test_No(n);

    }

    public static void test_No(int n){
        int flag=0;
        if(n==0 || n==1){
            System.out.println("This is not a prime number");
        } else{
            for(int i=2;i<=(int)Math.sqrt(n);i++){
                if(n%1==0){
                    System.out.println("This is not a prime number");
                flag=1;
                break;
                }
            }
            
        }
        if(flag ==0){
            System.out.println("This is a prime number");
        }
    }
}

Fibonacci Series

public class PrintFibonacciSeries{

    public static void main(String args[]){
        int n1=0;
        int n2=1;
        int n3=0;
        int count=10;

        System.out.print(n1+" "+n2+" ");
        for(int i=2;i<count;i++){
            n3=n1+n2;
            n1=n2;
            n2=n3;
            System.out.print(n3+" ");
        }
       
        
    }
}

Printing Prime Number

import java.util.*;

public class ListPrimeNo{
    public static void main(String args[]){
        int count =0;
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the starting number");
        int start = sc.nextInt();
        System.out.println("Enter the ending number");
        int end = sc.nextInt();
        System.out.println("Total Prime no between "+start+" " + "and"+" " + end+" "+"are : ");
        for(int i=start;i<=end;i++){
            if(Test_Prime(i)){
                System.out.print(i+","+" ");
                count += 1;
            }
        }
        System.out.println();
        System.out.println("Total Prime numbers are equal to = "+count);
    }

    public static boolean Test_Prime(int n){
        if(n<=1){
            return false;
        }
        for(int i=2;i<=(int)Math.sqrt(n);i++){
            if(n%i==0){
                return false;
            }
        }
        return true;
    }
}

Armstrong Number

import java.util.*;

public class ArmStrongNo {

  public static void main(String args[]) {
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter starting number number");
    int start = sc.nextInt();

    System.out.println("Enter ending number");
    int end = sc.nextInt();
    for (int i = start; i <= end; i++) {
      if (isArmStrong(i)) {
        System.out.print(i);
      }
    }
  }

  public static boolean isArmStrong(int n) {
    int temp;
    int digit = 0;
    int sum = 0;
    int last = 0;
    temp = n;
    while (temp > 0) {
      temp = temp / 10;
      digit += 1;
    }
    temp = n;
    while (temp > 0) {
      last = temp % 10;
      sum += Math.pow(last, digit);
      temp = temp / 10;
    }

    if (n == sum) {
      return true;
    } else {
      return false;
    }
  }
}

POLYMORPHISM

import bank;

class Person{
    String name;
    int age;

    public void printInfo(String name){
        System.out.println("Only name method was called");
        System.out.println(name);

    }
    public void printInfo(int age){
        System.out.println("Only age method was called");
        System.out.println(age);
    }
    public void printInfo(String name, int age){
        System.out.println("Both name and age method was called");
        System.out.println(name+""+age);
    }
}

public class TestPolymorphism{
    public static void main(String args[]){
        Person p1 = new Person();
        p1.name = "Sud";
        p1.age = 24;

        p1.printInfo(p1.age);
        p1.printInfo(p1.name);
        p1.printInfo(p1.name, p1.age);

        bank.Account account1 = new bank.Account(); //encapsulation
        account1.name = "customer1";
    }
}

Multiple Inheritance Using Interface

interface Animal{

    int eyes = 2;           //this value is fixed cant be changed
    public void walks();
    
}
interface Herbivore{

}

class Horse implements Animal, Herbivore{ //multiple inheritance not in class 
                                                but 
    public void walks(){                  // can be achieved using interface;
        System.out.println("Walks on 4 legs");
    }
}

public class TestInterface{
    public static void main(String args[]){
        Horse h1 = new Horse();
        h1.walks();
    }
}

Abstraction

abstractclassAnimal {
  Animal() {
    System.out.println("You are creating an animal");
  }

  public abstract void walk() {}

  public void eat() {
    System.out.println("animals eat");
  }
}

class Horse extends Animal {

  Horse() {
    System.out.println("You have created a Horse");
  }

  public void walk() {
    System.out.println("Walks on 4 legs");
  }
}

class Chicken extends Animal {

  public void walk() {
    System.out.println("walk on 2 legs");
  }
}

public class TestAbstraction {

  public static void main(String args[]) {
    Horse h1 = new Horse();
    h1.walk();
    h1.eat();
    //  Animal animal = new Animal();
    //  animal.walk();
  }
}

Inheritance

class Shape{   
 public void area(){
        System.out.println("Displays area");
    }
}

class Triangle extends Shape{                 
  //shape->triangle -> Single level inheritance;
    public void area(int l, int h){
        System.out.println(1/2*l*h);
    }

}

class EquilateralTriangle extends Triangle{    /
/ shape -> triangle -> equilateral-> multilevel inheritance
    public void area(int l, int h){
        System.out.println(1/2*l*h);
    }
}

class Circle extends Shape{                 
// Shape-> triangle
    public void area(int r){                
//Shape -> Circle -> Hierarchial Inheritance
//Single base class and multiple derived classes
        }
        System.out.println(3.14*r*r);       
    }



public class TestInheritance{
    public static void main(String args[]){
        Triangle t1 = new Triangle();
        t1.color = "Red";
    }
}

Copy Constructor

import java.util.*;

class Student1 {

  String name;
  int age;

  public void printInfo() {
    System.out.println(this.name);
    System.out.println(this.age);
  }

  Student1(Student1 s2) {
    this.name = s2.name;
    this.age = s2.age;
  }

  Student1() {}
}

public class OOPS3 {

  public static void main(String args[]) {
    Student1 s1 = new Student1(); //This is a Constructor:- to construct object
    s1.name = "aman";
    s1.age = 24;

    Student1 s2 = new Student1(s1);
    s2.printInfo();
  }
}

Parametric Constructor

    import java.util.*;
     class Student2{
        String name;
        int age;
        public void printInfo(){
            System.out.println(this.name);
            System.out.println(this.age);
        }
        Student2(String name, int age){
            this.name = name;     //this.name here name is name of object of class Student
            this.age = age;        // and name is parameter which is passed;

        }
    }


public class OOPS2{
    public static void main(String args[]){
       Student2 s1 = new Student2("Sud",24);    //This is a Constructor:- to construct object

       s1.printInfo();
    }
}

Constructor

class Student {
    String name;
    int age;

    public void printInfo() {
        System.out.println(this.name);
        System.out.println(this.age);
    }

    Student() {
        System.out.println("Constructor called");
    }
}

public class OOPS1 {
    public static void main(String args[]) {
        Student s1 = new Student();// This is a Constructor:- to construct object

        s1.name = "Sudeep";
        s1.age = 24;

        s1.printInfo();
    }
}

Class and Object

   class Pen{
    String color;
    String type; //ballpoint, gel

    public void write(){
        System.out.println("Writing something");
    }

    public void printColor(){
        System.out.println(this.color);
    }
    public void printType(){
        System.out.println(this.type);
    }

}


public class OOPS{
    public static void main(String args[]){
        Pen pen1 = new Pen();
       
        pen1.color = "blue";
        pen1.type = "gel";

        Pen pen2 = new Pen();
        pen2.color = "black";
        pen2.type = "ballpoint";

        pen1.write();
        pen1.write();

        pen1.printColor();
        pen2.printColor();

        pen1.printType();
        pen2.printType();
    }
}

Sorting an ArrayList

import java.util.*;

public class SortEleOfArraylist{
    public static void main(String args[]){
        ArrayList<String> colors = new ArrayList<String>();
        colors.add("Violet");
        colors.add("Indigo");
        colors.add("Green");
        colors.add("Yellow");
        colors.add("Orange");
        colors.add("Red");

        Collections.sort(colors);
        System.out.println("The sorted Array is :"+colors);
      //  for(String i : colors)
      //  System.out.println(i);
    
    }
}

Shuffling an ArrayList

import java.util.*;

public class ShuffleEleOfArraylist{
    public static void main(String args[]){
        ArrayList<String> colors = new ArrayList<String>();
        colors.add("Violet");
        colors.add("Indigo");
        colors.add("Green");
        colors.add("Yellow");
        colors.add("Orange");
        colors.add("Red");

        Collections.shuffle(colors);
        System.out.println("The Shuffled Array is :"+colors);
     
    }
}

Searching specific element of an ArrayList

import java.util.*;

public class SearchEleOfArraylist{
    public static void main(String args[]){
        ArrayList<String> colors = new ArrayList<String>();
        colors.add("Violet");
        colors.add("Indigo");
        colors.add("Green");
        colors.add("Yellow");
        colors.add("Orange");
        colors.add("Red");

       for(int i=0; i<colors.size();i++){
           if(colors.get(i)=="Green"){
               System.out.println("Green color found at index "+i);
           }
       }
    
    }
}

Java Invent

Labels

Replacing character in a String

Printing the given string in uppercase

Printing the given string to lowercase

Print substring of a String

Are Strings equal

Concatenating and printing a String

Concatenating a String

Concatenating a String

String to Int conversion using valueOf Method

Counting factor of a number between two specific numbers

Finding a palindromic number

Finding prime number using square root method

Fibonacci Series

Printing Prime Number

Armstrong Number

POLYMORPHISM

Multiple Inheritance Using Interface

Abstraction

Inheritance

Copy Constructor

Parametric Constructor

Constructor

Class and Object

Sorting an ArrayList

Shuffling an ArrayList

Searching specific element of an ArrayList

Google Script for Data Entry Form in Google Spreadsheet

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