Simple core Java projects idea's,and how to do.Full details with coding .

 Here are some simple Java project ideas:

1. A simple calculator that performs basic arithmetic operations (addition, subtraction, multiplication, and division).

2. A program that generates a random number and asks the user to guess it. The program should give hints (e.g. "too high" or "too low") until the user correctly guesses the number.

3. A program that converts temperatures between Fahrenheit and Celsius.

4. A program that converts a given number of days into years, weeks, and days.

5. A program that finds the factorial of a given number.

To implement these projects, you will need a basic understanding of the Java programming language, including concepts such as variables, data types, loops, and conditional statements. You will also need a development environment, such as Eclipse or IntelliJ IDEA, to write and run your code.

You can start by creating a new project and writing the code in a main method. Then you can test your code by running the main method and checking the output.

For more complex projects, you may want to learn about more advanced topics such as object-oriented programming, data structures, and file input/output.

Details:

1. A simple calculator that performs basic arithmetic operations can be implemented in Java using a combination of user input, conditional statements, and arithmetic operations. Here is an example of how you might implement a basic calculator:

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import java.util.Scanner;

public class Calculator {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.println("Welcome to the calculator!");

        while (true) {

            System.out.println("Enter the first number:");

            double num1 = scanner.nextDouble();

            System.out.println("Enter the second number:");

            double num2 = scanner.nextDouble();

            System.out.println("Enter the operation (+, -, *, /):");

            String operation = scanner.next();

            double result;

            switch (operation) {

                case "+":

                    result = num1 + num2;

                    break;

                case "-":

                    result = num1 - num2;

                    break;

                case "*":

                    result = num1 * num2;

                    break;

                case "/":

                    result = num1 / num2;

                    break;

                default:

                    System.out.println("Invalid operation.");

                    continue;

            }

            System.out.println("Result: " + result);

        }

    }

}

In this example, we are using the Scanner class to get input from the user. The program prompts the user to enter two numbers and an operation, then uses a switch statement to perform the corresponding arithmetic operation. The result is then printed to the console.

It's a simple calculator that perform basic arithmetic operations and you can use it as a starting point for more complex calculator projects. You can also add validation on inputs, exception handling, and add more options for user.

2. A program that generates a random number and asks the user to guess it can be implemented in Java using the java.util.Random class to generate the random number, and a combination of user input, loops, and conditional statements to check the user's guess. Here is an example of how you might implement this program:

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import java.util.Random;

import java.util.Scanner;

public class NumberGuess {

    public static void main(String[] args) {

        Random random = new Random();

        int target = random.nextInt(100) + 1;

        Scanner scanner = new Scanner(System.in);

        while (true) {

            System.out.println("Enter your guess:");

            int guess = scanner.nextInt();

            if (guess == target) {

                System.out.println("Congratulations! You guessed the number.");

                break;

            } else if (guess < target) {

                System.out.println("Too low. Try again.");

            } else if (guess > target) {

                System.out.println("Too high. Try again.");

            }

        }

    }

}

In this example, we are using the Random class to generate a random number between 1 and 100 (inclusive). The program prompts the user to enter a guess, then uses an infinite loop (while(true)) and an if-else statement to check the user's guess against the target number. If the user's guess is correct, the program prints a congratulations message and breaks out of the loop. If the guess is incorrect, the program prints a hint (too low or too high) and continues the loop.

You can add more complexity to the program by adding a limit to the number of guesses or tracking the number of guesses the user has made so far and providing a message when the user has reached the limit.

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Let's practice. JAVA.