Add Designer PAttern Builder

src/builder/Annotation.txt

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+###############################
+#          Builder            #
+###############################
+
+
+
+
+
+##### Language - EN
+
+
+- The Builder makes it possible to separate the complexity of creating this object into a specific class for that,
+in addition to making it possible to implement optional attributes more easily.
+
+- Whenever we have a complex object to be created, which has several attributes,
+or that has complicated creation logic, we can hide it all in a Builder.
+
+- In addition to centralizing the creation code and facilitating maintenance, we also make life easier for the classes 
+that need to create this complex class, after all the Builder interface tends to be clearer and easier to use.
+
+
+##### Language - PT-BR
+
+- O Builder possibilita a separação da complexidade da criação desse objeto em uma classe específica para isso, 
+além de possibilitar a implementação de atributos opcionais mais facilmente.
+
+- Sempre que tivermos um objeto complexo de ser criado, que possui diversos atributos, 
+ou que possui uma lógica de criação complicada, podemos esconder tudo isso em um Builder.
+
+- Além de centralizar o código de criação e facilitar a manutenção, ainda facilitamos a vida das classes
+ que precisam criar essa classe complexa, afinal a interface do Builder tende a ser mais clara e fácil de ser usada.

src/builder/BuilderInvoice.java

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+package builder;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+
+public class BuilderInvoice {
+
+	private String companyName;
+	private String cnpj;
+	private List<NoteItem> allItems = new ArrayList<>();
+	private double grossAmountl;
+	private double taxes;
+	private String notes;
+	private LocalDate date;
+
+	public BuilderInvoice toCompany(String companyName) {
+		this.companyName = companyName;
+		return this; //Return this use for method in cascade for BUILDER
+	}
+
+	public BuilderInvoice withCnpj(String cnpj) {
+		this.cnpj = cnpj;
+		return this; //Return this use for method in cascade for BUILDER
+	}
+
+	public BuilderInvoice withItem(NoteItem item) {
+		this.allItems.add(item);
+		this.grossAmountl += item.getValue();
+		this.taxes = item.getValue() * 0.05;
+		return this; //Return this use for method in cascade for BUILDER
+	}
+
+	public BuilderInvoice withNotes(String notes) {
+		this.notes = notes;
+		return this; //Return this use for method in cascade for BUILDER
+	}
+
+	public BuilderInvoice onCurrentDate() {
+		this.date = LocalDate.now();
+		return this; //Return this use for method in cascade for BUILDER
+	}
+
+	public Invoice builder() {
+		return new Invoice(companyName, cnpj, date, grossAmountl, taxes, allItems, notes);
+	}
+
+
+}

src/builder/BuilderMain.java

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+package builder;
+
+public class BuilderMain {
+
+	public static void main(String[] args) {
+		System.out.println("--------------------------------------------- Begin Test Builder");
+
+
+		// BUILDER -> Call in cascade because
+		BuilderInvoice builderInvoice = new BuilderInvoice();
+		builderInvoice.toCompany("Murillo Pezzuol LTDA")
+			.withCnpj("123456789")
+			.withItem(new NoteItem("Notebook", 200))
+			.withItem(new NoteItem("Mouse", 300))
+			.withItem(new NoteItem("Keyboard", 400))
+			.withNotes("Anottation....")
+			.onCurrentDate();
+		// continue if you want.....
+
+		Invoice invoice = builderInvoice.builder();//Return Object Invoice
+
+		System.out.println("Company Name: " + invoice.getCompanyName());// Murillo Pezzuol LTDA
+		System.out.println("Gross Amountl: " + invoice.getGrossAmountl()); // 900
+		System.out.println("Taxes: " + invoice.getTaxes()); // 20
+
+
+		System.out.println("--------------------------------------------- End Test Builder");
+	}
+
+}

src/builder/Invoice.java

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+package builder;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Invoice {
+
+	private String companyName;
+	private String cnpj;
+	private LocalDate dateOfIssue;
+	private double grossAmountl;
+	private double taxes;
+	private List<NoteItem> allItems = new ArrayList<>();
+	private String notes;
+
+
+	public Invoice(String companyName, String cnpj, LocalDate dateOfIssue, double grossAmountl, double taxes,
+			List<NoteItem> allItems, String notes) {
+		super();
+		this.companyName = companyName;
+		this.cnpj = cnpj;
+		this.dateOfIssue = dateOfIssue;
+		this.grossAmountl = grossAmountl;
+		this.taxes = taxes;
+		this.allItems = allItems;
+		this.notes = notes;
+	}
+
+
+	public String getCompanyName() {
+		return companyName;
+	}
+
+
+	public void setCompanyName(String companyName) {
+		this.companyName = companyName;
+	}
+
+
+	public String getCnpj() {
+		return cnpj;
+	}
+
+
+	public void setCnpj(String cnpj) {
+		this.cnpj = cnpj;
+	}
+
+
+	public LocalDate getDateOfIssue() {
+		return dateOfIssue;
+	}
+
+
+	public void setDateOfIssue(LocalDate dateOfIssue) {
+		this.dateOfIssue = dateOfIssue;
+	}
+
+
+	public double getGrossAmountl() {
+		return grossAmountl;
+	}
+
+
+	public void setGrossAmountl(double grossAmountl) {
+		this.grossAmountl = grossAmountl;
+	}
+
+
+	public double getTaxes() {
+		return taxes;
+	}
+
+
+	public void setTaxes(double taxes) {
+		this.taxes = taxes;
+	}
+
+
+	public List<NoteItem> getAllItems() {
+		return allItems;
+	}
+
+
+	public void setAllItems(List<NoteItem> allItems) {
+		this.allItems = allItems;
+	}
+
+
+	public String getNotes() {
+		return notes;
+	}
+
+
+	public void setNotes(String notes) {
+		this.notes = notes;
+	}
+
+
+}

src/builder/NoteItem.java

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+package builder;
+
+public class NoteItem {
+
+	private String name;
+	private double value;
+
+	public NoteItem(String name, double value) {
+		super();
+		this.name = name;
+		this.value = value;
+	}
+
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	public double getValue() {
+		return value;
+	}
+	public void setValue(double value) {
+		this.value = value;
+	}
+
+}