Java Design patterns

Java Design Patterns/javadevjournal/design/creational/builder/BuilderPatternDemo.java

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+package javadevjournal.design.creational.builder;
+
+/**
+ * @author Kunwar
+ * Builder Pattern Client Class
+ * Create Computer object with mandatory and optional properties
+ */
+public class BuilderPatternDemo {
+	public static void main(String[] args) {
+
+		Computer model1 = new Computer.ComputerBuilder(
+				"1 TB", "16 GB","15.6").setBluetoothEnabled(true)
+				.setGraphicsCardEnabled(true).setTouchScreenEnabled(true).setWebCamEnabled(true).build();
+		System.out.println("model1: " + model1.toString());
+
+		Computer model2 = new Computer.ComputerBuilder(
+				"256 GB", "8 GB","14.6").setBluetoothEnabled(true)
+				.setGraphicsCardEnabled(true).build();
+		System.out.println("model2: "+model2.toString());
+
+
+		Computer model3 = new Computer.ComputerBuilder(
+				"128 GB", "4 GB","13.6").build();
+		System.out.println("model3: "+model3.toString());
+	}
+}

Java Design Patterns/javadevjournal/design/creational/builder/Computer.java

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+package javadevjournal.design.creational.builder;
+
+/**
+ * @author Kunwar
+ * Product Class
+ * Builder Pattern Class
+ */
+public class Computer {
+	//required parameters
+	private String HDD;
+	private String RAM;
+	private String screenSize;
+
+	//optional parameters
+	private boolean isGraphicsCardEnabled;
+	private boolean isBluetoothEnabled;
+	private boolean isWebCamEnabled;
+	private boolean isTouchScreenEnabled;
+
+	public String getHDD() {
+		return HDD;
+	}
+
+	public String getRAM() {
+		return RAM;
+	}
+
+	public String getScreenSize() {
+		return screenSize;
+	}
+
+	public boolean isGraphicsCardEnabled() {
+		return isGraphicsCardEnabled;
+	}
+
+	public boolean isBluetoothEnabled() {
+		return isBluetoothEnabled;
+	}
+
+	public boolean isWebCamEnabled() {
+		return isWebCamEnabled;
+	}
+
+	public boolean isTouchScreenEnabled() {
+		return isTouchScreenEnabled;
+	}
+
+	private Computer(ComputerBuilder builder) {
+		this.HDD=builder.HDD;
+		this.RAM=builder.RAM;
+		this.screenSize=builder.screenSize;
+		this.isGraphicsCardEnabled=builder.isGraphicsCardEnabled;
+		this.isBluetoothEnabled=builder.isBluetoothEnabled;
+		this.isTouchScreenEnabled=builder.isTouchScreenEnabled;
+		this.isWebCamEnabled=builder.isWebCamEnabled;
+		this.isWebCamEnabled=builder.isWebCamEnabled;
+	}
+	
+	//Builder Class
+	public static class ComputerBuilder{
+
+		// required parameters
+		private String HDD;
+		private String RAM;
+		private String screenSize;
+
+		// optional parameters
+		private boolean isGraphicsCardEnabled;
+		private boolean isBluetoothEnabled;
+		private boolean isWebCamEnabled;
+		private boolean isTouchScreenEnabled;
+
+		public ComputerBuilder(String hdd, String ram, String screenSize){
+			this.HDD=hdd;
+			this.RAM=ram;
+			this.screenSize=screenSize;
+		}
+
+		public ComputerBuilder setGraphicsCardEnabled(boolean isGraphicsCardEnabled) {
+			this.isGraphicsCardEnabled = isGraphicsCardEnabled;
+			return this;
+		}
+
+		public ComputerBuilder setBluetoothEnabled(boolean isBluetoothEnabled) {
+			this.isBluetoothEnabled = isBluetoothEnabled;
+			return this;
+		}
+
+		public ComputerBuilder setWebCamEnabled(boolean webCamEnabled) {
+			isWebCamEnabled = webCamEnabled;
+			return this;
+		}
+
+		public ComputerBuilder setTouchScreenEnabled(boolean touchScreenEnabled) {
+			isTouchScreenEnabled = touchScreenEnabled;
+			return this;
+		}
+
+		public Computer build(){
+			return new Computer(this);
+		}
+	}
+
+	@Override
+	public String toString() {
+		return "Computer{" +
+				"HDD='" + HDD + '\'' +
+				", RAM='" + RAM + '\'' +
+				", screenSize='" + screenSize + '\'' +
+				", isGraphicsCardEnabled=" + isGraphicsCardEnabled +
+				", isBluetoothEnabled=" + isBluetoothEnabled +
+				", isWebCamEnabled=" + isWebCamEnabled +
+				", isTouchScreenEnabled=" + isTouchScreenEnabled +
+				'}';
+	}
+}