Java Interview Guide : 200+ Interview Questions and Answers - toString method

The video tutorial explains the toString method in Java, which is inherited from the Object class. It describes the default behavior of the toString method, which outputs the class name and memory address. To display object details, the toString method must be overridden. The tutorial demonstrates how to override this method and generate it using Eclipse, highlighting the importance of adhering to the method signature. It also discusses different string formatting options, such as string concatenation and string format, and their performance implications.

What is the default behavior of the toString method in Java?

• It returns a null value.

• It throws an error if not overridden.

• It prints the object's attributes.

• It prints the class name and memory location.

Why is it important to override the toString method?

• To improve memory efficiency.

• To provide a meaningful string representation of the object.

• To enable object serialization.

• To enhance security.

What is a mandatory requirement for the toString method signature?

• It must throw an exception.

• It must be private.

• It must return a string.

• It must accept parameters.

Which tool can be used to generate the toString method in Java?

• Visual Studio

• Eclipse

• IntelliJ IDEA

• NetBeans

What is the recommended formatting style for the toString method for better performance?

• String concatenation

• String builder

• String buffer

• String format