Now, let's explore a few practical applications of these methods through the following example tasks:

Task 1

Create a program to securely encode a message. Display the encrypted message on the console.

We will write our own encryption method that shifts each character in the original string 3 positions forward in the ASCII table to encrypt the message.

Main.java


              12345678910111213141516
            
package com.example;

public class Main {
    public static void main(String[] args) {
        String secretMessage = "hello world"; // Original message
        char[] codedMessage = secretMessage.toCharArray(); // Convert message to a char array
        
        // Loop through each character and shift by 3 positions in the ASCII table to encrypt
        for (int i = 0; i < codedMessage.length; i++) {
            // Encrypt character
            codedMessage[i] = (char) (codedMessage[i] + 3);
        }
        // Print the encrypted message
        System.out.println(new String(codedMessage));
    }
}

This code demonstrates a simple encryption method for a password or secret message. The string hello world is converted into a character array, and each character is shifted forward by 3 positions in the ASCII table using (char) (codedMessage[i] + 3). The encrypted message is then printed to the console.

Task 2

You upload a document title, and it needs to be converted to uppercase with underscores _ added between words to create a system-friendly filename.

Main.java


              12345678910
            
package com.example;

public class Main {
    public static void main(String[] args) {
        String documentTitle = "Quarterly financial report"; // Document title
        String systemFileName = documentTitle.toUpperCase().replace(" ", "_");
        
        System.out.println(systemFileName); // Output
    }
}

This code processes a document title to create a system-friendly filename. It uses toUpperCase() to convert all letters to uppercase and replace(" ", "_") to replace spaces with underscores, ensuring consistency and compatibility for file storage. The result is then displayed on the console.

1. What will be printed to the console?

2. What will be printed to the console?

3. What will be printed to the console?

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 31

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Now, let's explore a few practical applications of these methods through the following example tasks:

Task 1

Create a program to securely encode a message. Display the encrypted message on the console.

We will write our own encryption method that shifts each character in the original string 3 positions forward in the ASCII table to encrypt the message.

Main.java


              12345678910111213141516
            
package com.example;

public class Main {
    public static void main(String[] args) {
        String secretMessage = "hello world"; // Original message
        char[] codedMessage = secretMessage.toCharArray(); // Convert message to a char array
        
        // Loop through each character and shift by 3 positions in the ASCII table to encrypt
        for (int i = 0; i < codedMessage.length; i++) {
            // Encrypt character
            codedMessage[i] = (char) (codedMessage[i] + 3);
        }
        // Print the encrypted message
        System.out.println(new String(codedMessage));
    }
}

Task 2

You upload a document title, and it needs to be converted to uppercase with underscores _ added between words to create a system-friendly filename.

Main.java


              12345678910
            
package com.example;

public class Main {
    public static void main(String[] args) {
        String documentTitle = "Quarterly financial report"; // Document title
        String systemFileName = documentTitle.toUpperCase().replace(" ", "_");
        
        System.out.println(systemFileName); // Output
    }
}

1. What will be printed to the console?

2. What will be printed to the console?

3. What will be printed to the console?

Var allt tydligt?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 31

Practical Applications of String Methods

Task 1

Task 2

1. What will be printed to the console?

2. What will be printed to the console?

3. What will be printed to the console?

Practical Applications of String Methods

Task 1

Task 2

1. What will be printed to the console?

2. What will be printed to the console?

3. What will be printed to the console?