The String.format() method in Java allows you to create formatted strings using placeholders. It is similar to printf but returns the formatted string instead of printing it. Placeholders, such as %s for strings, %d for integers, and %f for floating-point numbers, specify the desired format. For example, String.format("Hello, %s!", "John") returns “Hello, John!”.
You can also control precision, width, and alignment, such as %.2f for two decimal places or %10s for right-aligned text. It is commonly used for creating user-friendly outputs, logging, and constructing strings dynamically with specific formatting requirements.