Question

Let us consider the builder pattern where Product has four possible parts Part1, Part2, Part3, and Part4 (all integer).

Assume we have three concrete builders: ConcreteBuilder1, ConcreteBuilder2, and ConcreteBuilder3.

ConcreteBuilder1 assigns 11, 12, 13, and 14 to Part1, Part2, Part 3, and Part4 respectively.

ConcreteBuilder2 assigns 21, 22, 23, and 24 to Part1, Part2, Part 3, and Part4 respectively.

ConcreteBuilder3 assigns 31, 32, 33, and 34 to Part1, Part2, Part3, and Part4 respectively.

1) Give the UML diagram.

2) Implement the UML class diagram given in 1 in Java.

Answer 1

1) UML diagram below

2) Java prpgram below

class Product
{
  
private String part1;
private String part2;
private String part3;
private String part4;
  
public void setPart1(String _part1)
{   this.part1 = _part1;
}
  
public void setPart2(String _part2)
{
this.part2 = _part2;
}
  
public void setPart3(String _part3)
{
this.part3 = _part3;
}
  
public void setPart4(String _part4)
{
this.part4 = _part4;
}
  
public String toString()
{
return " Part 1 : "+part1+
"\nPart 2 : "+part2+
"\nPart 3 : "+part3+
"\nPart 4 : "+part4;
}
}

interface Builder{
  
void buildPart1();
void buildPart2();
void buildPart3();
void buildPart4();
Product getProduct();
}

class ConcreteBuilder1 implements Builder{
Product product;
  
ConcreteBuilder1(){
this.product = new Product();
}
public void buildPart1(){
product.setPart1("11");
}
public void buildPart2(){
product.setPart2("12");
}
public void buildPart3(){
product.setPart3("13");
}
public void buildPart4(){
product.setPart4("14");
}
public Product getProduct(){
return product;
}
}

class ConcreteBuilder2 implements Builder{
Product product;
  
ConcreteBuilder2(){
this.product = new Product();
}
public void buildPart1(){
product.setPart1("21");
}
public void buildPart2(){
product.setPart2("22");
}
public void buildPart3(){
product.setPart3("23");
}
public void buildPart4(){
product.setPart4("24");
}
public Product getProduct(){
return product;
}
}

class ConcreteBuilder3 implements Builder{
Product product;
  
ConcreteBuilder3(){
this.product = new Product();
}
public void buildPart1(){
product.setPart1("31");
}
public void buildPart2(){
product.setPart2("32");
}
public void buildPart3(){
product.setPart3("33");
}
public void buildPart4(){
product.setPart4("34");
}
public Product getProduct(){
return product;
}
}

class ProductAssembler {

Builder builder ;
ProductAssembler (Builder builder){
this.builder = builder;
}

public void assemble(){
builder.buildPart1();
builder.buildPart2();
builder.buildPart3();
builder.buildPart4();
}
}

public class Main {
public static void main (String args[]){
  
Builder b1 = new ConcreteBuilder1();
ProductAssembler assembler = new ProductAssembler(b1);
  
assembler.assemble();
  
Product finalProduct = b1.getProduct();
System.out.println(" Final Product " + finalProduct);
  
}
}