Tech Jargon - Decoded

💡 Approach Step 1: Import the Scanner class: Import java.util.Scanner to enable reading input from the user via the console. This class will be used to create a Scanner object. Step 2: Create a Scanner object: Inside the main method (or any relevant method), create a Scanner object that reads from System.in (standard input stream). This will allow you to read input from the keyboard. Step 3: Prompt the user for the first integer: Display a message to the console prompting the user to enter the first integer. Step 4: Read the first integer: Use the nextInt() method of the Scanner object to read the first integer entered by the user and store it in an integer variable. Step 5: Prompt the user for the second integer: Display a message to the console prompting the user to enter the second integer. Step 6: Read the second integer: Use the nextInt() method of the Scanner object to read the second integer entered by the user and store it in another integer variable. Step 7: Calculate the sum: Add the two integer variables together and store the result in a new integer variable called sum. Step 8: Print the sum: Display the calculated sum to the console using System.out.println(), along with a descriptive message. Step 9: Close the Scanner: Call the close() method on the Scanner object to release the resources. ───────────────────────────── Have you Understood? Drop a reaction: ❤️ Understood | 👎 Not Understood

☕ Calculate sum of two integers taken as input Write a Java program that reads two integer values from standard input using the Scanner class. Calculate the sum of these two integers and print the result to the console using System.out.println().

💻 Java Code:

import java.util.Scanner;

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

        System.out.print("Enter a float value: ");

        float floatValue = scanner.nextFloat();

        System.out.println("You entered: " + floatValue);

        scanner.close();
    }
}

💡 Approach Here's a step-by-step approach for getting float input from the user and displaying it in Java: Step 1: Import the Scanner class. This allows you to read input from the console. Step 2: Create a Scanner object. This object will be used to read the float value entered by the user. Step 3: Prompt the user to enter a float value. Display a message on the console, asking the user to input a float. Step 4: Read the float value using the nextFloat() method of the Scanner object. This method reads the next float value entered by the user. Step 5: Display the float value that was entered by the user. Print the value to the console using System.out.println(). Step 6: Close the Scanner object. This releases the resources used by the scanner. This is good practice, especially in larger programs. ───────────────────────────── Have you Understood? Drop a reaction: ❤️ Understood | 👎 Not Understood

☕ Get float input from the user and display it Write a Java program that prompts the user to enter a floating-point number using the Scanner class. The program should then read the float value entered by the user and display it to the console using System.out.println().

💻 Java Code:

import java.util.Scanner;

public class GetAndDisplayInteger {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter an integer: ");

        int number = scanner.nextInt();

        System.out.println("You entered: " + number);

        scanner.close();
    }
}

💡 Approach Step 1: Import the Scanner class: This allows you to read input from the console. Add import java.util.Scanner; at the beginning of your Java file. Step 2: Create a Scanner object: Inside the main method (or any other method where you want to take input), create an instance of the Scanner class: Scanner scanner = new Scanner(System.in);. This links the scanner to the standard input (keyboard). Step 3: Prompt the user: Display a message to the console asking the user to enter an integer: System.out.print("Enter an integer: ");. System.out.print is used instead of System.out.println to keep the cursor on the same line as the prompt. Step 4: Read the integer input: Use the nextInt() method of the Scanner object to read the integer entered by the user: int number = scanner.nextInt();. This will store the input as an integer in the variable number. Step 5: Display the integer: Use System.out.println() to display the value of the integer that the user entered: System.out.println("You entered: " + number);. Step 6: Close the Scanner: It's a good practice to close the Scanner object when you're done using it: scanner.close();. This releases system resources. ───────────────────────────── Have you Understood? Drop a reaction: ❤️ Understood | 👎 Not Understood

☕ Get integer input from the user and display it Write a Java program that prompts the user to enter an integer using Scanner. Read the integer value entered by the user from the standard input and then display that integer to the console using System.out.println().

💻 Java Code:

public class MyInfo {

    public static void main(String[] args) {
        System.out.println("John Doe");
        System.out.println("123 Main Street");
        System.out.println("Anytown, CA 91234");
    }
}

💡 Approach Step 1: Create a Java class: Every Java program needs a class. Name it something descriptive like MyInfo. This will be the container for our code. Step 2: Define the main method: The main method is the entry point of your program. It's where the execution begins. The method signature is public static void main(String[] args). Step 3: Use System.out.println() to print your name: This method prints the specified string to the console, followed by a new line. Include your name as the string argument. Step 4: Use System.out.println() to print your address: Use this method again, this time including your address as the string argument. You may use multiple System.out.println() calls if your address consists of multiple lines. ───────────────────────────── Have you Understood? Drop a reaction: ❤️ Understood | 👎 Not Understood

☕ Print your name and address Write a Java program that prints your name and address to the console using System.out.println(). Each piece of information (name, street address, city, state, zip code) should be printed on a separate line. Demonstrate the use of string literals and proper concatenation for output.

💻 Java Code:

public class HelloWorld {

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

💡 Approach Step 1: Create a Java Class: Create a new file named HelloWorld.java (the filename must match the class name). This file will contain your Java code. Step 2: Define the Main Method: Inside the HelloWorld.java file, define the main method. This is the entry point of your Java program. The method signature is always public static void main(String[] args). Step 3: Print "Hello, World!" to the console: Inside the main method, use System.out.println("Hello, World!"); to display the output. System.out.println() is a standard Java method for printing text to the console. Step 4: Compile the Code: Open a terminal or command prompt, navigate to the directory containing HelloWorld.java, and compile the code using the command javac HelloWorld.java. This creates a HelloWorld.class file. Step 5: Run the Code: In the same terminal, execute the compiled code using the command java HelloWorld. This will run your program and print "Hello, World!" to the console. ───────────────────────────── Have you Understood? Drop a reaction: ❤️ Understood | 👎 Not Understood

☕ Hello World program Write a Java program that prints the phrase "Hello, World!" to the console using System.out.println(). This exercise demonstrates the fundamental structure of a Java program and basic output to the standard output stream.

☕ Basic Syntax & Input/Output

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Circular Queue Implementation

public class CircularQueue {
    private int[] queue;
    private int front;
    private int rear;
    private int size;
    private int capacity;

    public CircularQueue(int capacity) {
        this.capacity = capacity;
        this.queue = new int[capacity];
        this.front = -1;
        this.rear = -1;
        this.size = 0;
    }

    public boolean isEmpty() {
        return size == 0;
    }

    public boolean isFull() {
        return size == capacity;
    }

    public void enqueue(int data) {
        if (isFull()) {
            System.out.println("Queue is full.");
            return;
        }
        if (isEmpty()) {
            front = 0;
        }
        rear = (rear + 1) % capacity;
        queue[rear] = data;
        size++;
        System.out.println(data + " enqueued into queue");
    }

    public int dequeue() {
        if (isEmpty()) {
            System.out.println("Queue is empty.");
            return -1;
        }
        int data = queue[front];
        front = (front + 1) % capacity;
        size--;
        if (size == 0) {
            front = -1;
            rear = -1;
        }
        System.out.println(data + " dequeued from queue");
        return data;
    }

    public int peek() {
        if (isEmpty()) {
            System.out.println("Queue is empty.");
            return -1;
        }
        return queue[front];
    }

    public static void main(String[] args) {
        CircularQueue queue = new CircularQueue(5);
        queue.enqueue(1);
        queue.enqueue(2);
        queue.enqueue(3);
        queue.enqueue(4);
        queue.enqueue(5);
        queue.dequeue();
        queue.enqueue(6);
        System.out.println("Front element is " + queue.peek());
    }
}

Queue Implementation using Array

public class Queue {
    private int[] queueArray;
    private int front;
    private int rear;
    private int capacity;

    public Queue(int size) {
        capacity = size;
        queueArray = new int[capacity];
        front = 0;
        rear = -1;
    }

    public boolean isFull() {
        return rear == capacity - 1;
    }

    public boolean isEmpty() {
        return front > rear;
    }

    public void enqueue(int data) {
        if (isFull()) {
            System.out.println("Queue is full!");
            return;
        }
        queueArray[++rear] = data;
        System.out.println(data + " enqueued to queue");
    }

    public int dequeue() {
        if (isEmpty()) {
            System.out.println("Queue is empty!");
            return -1; 
        }
        int data = queueArray[front++];
        System.out.println(data + " dequeued from queue");
        return data;
    }

    public int peek() {
        if (isEmpty()) {
            System.out.println("Queue is empty!");
            return -1;
        }
        return queueArray[front];
    }

    public static void main(String[] args) {
        Queue queue = new Queue(5);
        queue.enqueue(10);
        queue.enqueue(20);
        queue.enqueue(30);
        System.out.println("
Front element is: " + queue.peek());
        queue.dequeue();
        queue.dequeue();
        System.out.println("
Front element is: " + queue.peek());
    }
}

Next Greater Element using Stack

import java.util.Stack;
import java.util.Arrays;

public class NextGreaterElement {

    public static int[] nextGreaterElement(int[] arr) {
        int n = arr.length;
        int[] result = new int[n];
        Arrays.fill(result, -1);
        Stack<Integer> stack = new Stack<>();

        for (int i = 0; i < n; i++) {
            while (!stack.isEmpty() && arr[i] > arr[stack.peek()]) {
                result[stack.pop()] = arr[i];
            }
            stack.push(i);
        }

        return result;
    }

    public static void main(String[] args) {
        int[] arr = {4, 5, 2, 25};
        int[] result = nextGreaterElement(arr);
        System.out.println(Arrays.toString(result));
    }
}

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