Q12: What is the Builder Method design pattern in Java?
The Builder design pattern is a way to build things step-by-step. It helps you make complicated things using a specific process. This pattern separates the building part from the final thing, so you can make different final things using the same process. The Builder pattern is useful when you want to make complicated things, but the process to make them is simple. It lets you make the thing little by little and then get the final thing when it’s done.
Here is an example of how the Builder Pattern might be implemented:
Java
public class BuilderExample { public static void main(String[] args) { // create the director Director director = new Director(); // create the builder Builder builder = new ConcreteBuilder(); // construct the complex object director.construct(builder); // retrieve the finished product ComplexObject complexObject = builder.getResult(); } } class ComplexObject { // fields for the complex object } class Director { public void construct(Builder builder) { // use the builder to construct the complex object } } abstract class Builder { // methods for constructing the complex object public abstract ComplexObject getResult(); } class ConcreteBuilder extends Builder { private ComplexObject object = new ComplexObject(); // methods for constructing the complex object public ComplexObject getResult() { return object; } } |
Top 30 Java Design Patterns Interview Question
If you want to be a software developer or engineer, you need to know about design patterns. They’re like solutions to common problems in software design. In job interviews, employers ask about design patterns to see if you know what you’re doing. So, it’s important to be ready for those questions. We’ve made a list of 30 design pattern interview questions in Java. They cover different types of design patterns, like ones for creating things, organizing things, and making things work.
Top Java Design Patterns Interview Question
- Q1: What is a design pattern in Java?
- Q2: Difference between design pattern and architectural pattern.
- Q3: What are the types of design patterns in Java?
- Q4: What is the Singleton design pattern in Java?
- Q5: What is the Factory Method design pattern in Java?
- Q6: What is the Observer design pattern in Java?
- Q7: What is the Adapter design pattern in Java?
- Q8: What is the Decorator design pattern in Java?
- Q9: What is the Command design pattern in Java?
- Q10: What is the Iterator design pattern in Java?
- Q11: What is the Template Method design pattern in Java?
- Q12: What is the Builder Method design pattern in Java?
- Q13: How many ways we you create a singleton pattern?
- Q14: Describe the strategy to design a pattern?
- Q15: What is the decorator pattern in Java explain it with an example?
- Q16: Difference between Strategy and State design Pattern in Java?
- Q17: What are the advantages of Composite Design Pattern in Java?
- Q18: Describe the uses of the Composite Design Pattern.
- Q19: What are Some Design Patterns used in the JDK library?
- Q20: Advantage of Builder design pattern in Java.
- Q21: How to write Thread-safe Singleton in Java?
- Q22: Is it possible to create a clone of a singleton object?
- Q23: What is the proxy pattern, and what does it do?
- Q24: Explain some different type of proxies?
- Q25: Explain the Chain of Responsibility Pattern, when it is used & their advantages.
- Q26: How Bridge Pattern is different from the Adapter Pattern?
- Q27: What is the difference between the Dependency Injection and Service Locator Patterns?
- Q28: Explain the Intercepting Filter Design Pattern, components and its advantages?
- Q29: Explain Data Access Object (DAO) Design Pattern?
- Q30: what is the difference between Value Object (VO) and Java Data Object (JDO)?
- Conclusion