Explanation

This Java program is designed to demonstrate fundamental operations on strings, which are sequences of characters. It takes two strings as input from the user and then performs three main tasks: converting a string to lowercase, comparing two strings for equality, and concatenating two strings.

Input Collection: The program first initializes a Scanner object, which is used to read input from the console. It then prompts the user to enter a "first string" and a "second string," reading each complete line of input using sc.nextLine() and storing them in str1 and str2 variables, respectively.
Lowercase Conversion: It takes the str1 (first string) and calls its toLowerCase() method. This method returns a new string where all uppercase characters in str1 have been converted to their lowercase equivalents, while other characters remain unchanged. This new string is then printed to the console.
String Comparison: The program then compares str1 and str2 to check if they are identical. It uses the equals() method, which performs a case-sensitive comparison of the content of the two strings. If the characters in both strings match exactly, including their case, the program prints that the strings are "EQUAL"; otherwise, it prints "NOT EQUAL." The commented line str1.equalsIgnoreCase(str2) is mentioned as an alternative for case-insensitive comparison, but the active code uses equals().
String Concatenation: Finally, the program demonstrates how to join two strings together. It creates a new string called combined by using the + operator to join str1, a space character (" "), and str2. This combined string is then printed. The line str1.concat(str2); is shown as another method for concatenation, but its result is not stored or printed, highlighting that String methods often return new strings that must be captured.
Resource Cleanup: After all operations are complete, sc.close() is called to release the system resources associated with the Scanner object.

Algorithm

The algorithm implemented by this Java program is as follows:

Initialize a Scanner object to read user input.
Prompt the user to enter the first string.
Read the first string from the console and store it in str1.
Prompt the user to enter the second string.
Read the second string from the console and store it in str2.
Convert str1 to its lowercase equivalent using toLowerCase() and print the result.
Compare str1 and str2 for exact equality (case-sensitive) using equals().
If the strings are equal, print a message indicating equality; otherwise, print a message indicating inequality.
Concatenate str1, a space, and str2 using the + operator to form a new string combined.
Print the combined string.
Close the Scanner object to release resources.

Explanation

Input Collection: The program first initializes a Scanner object, which is used to read input from the console. It then prompts the user to enter a "first string" and a "second string," reading each complete line of input using sc.nextLine() and storing them in str1 and str2 variables, respectively.
Lowercase Conversion: It takes the str1 (first string) and calls its toLowerCase() method. This method returns a new string where all uppercase characters in str1 have been converted to their lowercase equivalents, while other characters remain unchanged. This new string is then printed to the console.
String Comparison: The program then compares str1 and str2 to check if they are identical. It uses the equals() method, which performs a case-sensitive comparison of the content of the two strings. If the characters in both strings match exactly, including their case, the program prints that the strings are "EQUAL"; otherwise, it prints "NOT EQUAL." The commented line str1.equalsIgnoreCase(str2) is mentioned as an alternative for case-insensitive comparison, but the active code uses equals().
String Concatenation: Finally, the program demonstrates how to join two strings together. It creates a new string called combined by using the + operator to join str1, a space character (" "), and str2. This combined string is then printed. The line str1.concat(str2); is shown as another method for concatenation, but its result is not stored or printed, highlighting that String methods often return new strings that must be captured.
Resource Cleanup: After all operations are complete, sc.close() is called to release the system resources associated with the Scanner object.

To implement Java Programs using Strings

To implement Java Programs using Strings

Explanation

Algorithm

To implement Java Programs using Strings

Explanation

Algorithm