How to Include Variables in Strings in Java Without Concatenation?

What are the methods to include variables directly in strings in Java without using concatenation?

String name = "John";
String greeting = String.format("Hello, %s!", name); // Using String.format

In Java, including variables directly within strings can enhance readability and maintainability of code. While traditional string concatenation with the '+' operator works, it can be cumbersome, leading to less aesthetically pleasing code. This answer explores more elegant alternatives for variable inclusion in strings, resembling the desired format without concatenation.

// Using String.format
String name = "Alice";
String age = "30";
String introduction = String.format("My name is %s and I am %s years old.", name, age); // Output: My name is Alice and I am 30 years old.
// Using MessageFormat
String message = MessageFormat.format("Hello, {0}! You are {1} years old.", "Alice", 30); // Output: Hello, Alice! You are 30 years old.

Causes

• Desire for cleaner and more readable code.
• Handling multiple variables dynamically in strings.

Solutions

• Use String.format() method for formatted strings.
• Utilize MessageFormat class for internationalization.
• Explore Java's String.join() for joining multiple strings.
• Consider using StringBuilder for extensive concatenation.

Mistake: Forgetting to import java.text.MessageFormat when using MessageFormat class.

Solution: Add import statement: import java.text.MessageFormat.

Mistake: Misplacing variable types leading to incorrect formatting in String.format.

Solution: Ensure to match the variable type with the format specifier correctly.