1600 PMP mock questions 1400 CAPM mock questions 800 SCJP 6 mock questions 600 OCAJP 7 mock questions 590 OCPJP 7 mock questions 556 SCWCD 5 mock questions 500 OCEJWCD 6 mock questions pdfDownload (java,struts, hibernet etc)

OOPs and Design Pattern interview questions

  • What is Observer pattern ? Explain with Code Example ? view answer
  • "is-a" relationship describes inheritance relationship between objects view answer
  • has-a relationship, which is also called object composition view answer
  • The four main concepts are involved in OOP view answer
  • Example Java Code For Association & Aggregation & Composition view answer
  • What are the common things need to consider while Creating and Destroying Objects view answer
  • what is the difference between encapsulation and data hiding? explain with Code example? view answer
  • Dependency In Java view answer
  • Is Singleton class is serialized ? view answer
  • What is Singleton ? and Double-checked locking ? view answer
  • What is Factory Method pattern? view answer
  • What is Adapter pattern ? view answer
  • What is Proxy and Decorator patterns ? With Java Example ? view answer
  • Brief Introduction to OOP Concepts view answer
  • What is Abstract Factory Pattern ? With Code Example ? view answer

!!! OOPs and Design Pattern interview questions !!!

"is-a" relationship describes inheritance relationship between objects



"is-a" relationship describes inheritance relationship between objects. If you can talk something with word "is". They can be described with keyword extends in coding. "is-a" relationship is also called classification.

public class Pepperoni extends Pizza {//is-a relationship
private int size;//has a relationship
private String style;

public int getSize() {
return size;
}
public void setSize(int sz) {
this.size = sz;
}

public String getStyle() {
return style;
}
public void setStyle(String style) {
this.style = style;
}
}



Note that is-a relationship described with Java code by using extends keyword

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