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ImJavaDeveloperImJavaDeveloper
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Added Builder Pattern
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‎Builder/.gitignore‎

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.gradle
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/build/
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/bin/
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!gradle/wrapper/gradle-wrapper.jar
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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/out/
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/

‎Builder/build.gradle‎

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/********** Applying Plugin *************/
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apply plugin: 'java'
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apply plugin: 'eclipse'
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/********** buildscript *************/
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buildscript {
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ext {
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version = '2.0.1.RELEASE'
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}
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repositories {
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mavenCentral()
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}
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dependencies {
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}
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}
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repositories {
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mavenCentral()
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}
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sourceCompatibility = 1.7
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group = 'com.java.design.pattern'
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version = '0.0.1-SNAPSHOT'
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println "Starting Building Project:"+project.name
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jar
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{
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baseName=project.name
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}
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‎Builder/src/main/java/com/java/design/pattern/builder/TestBuilder.java‎

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package com.java.design.pattern.builder;
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public class TestBuilder {
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public static void main(String[] args) {
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User user1=new User.UserBuilder()
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.firstName("Rahat")
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.lastName("Ali")
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.age(31)
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.address("Pune")
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.occupation("Programmer")
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.mobile("8765434567")
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//.maritalStatus("Married")
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.build();
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System.out.println(user1.toString());
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}
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}

‎Builder/src/main/java/com/java/design/pattern/builder/User.java‎

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package com.java.design.pattern.builder;
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/*To build the builder, we must have all attributes should be private
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There must be inner static class
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constructer of outer class which accept the instance of inner class.
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*/
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public class User {
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private String firstName;
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private String lastName;
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private String address;
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private int age;
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private String mobile;
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private String maritalStatus;
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private String occupation;
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private User(UserBuilder userBuilder)
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{
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this.firstName=userBuilder.fname;
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this.lastName=userBuilder.lname;
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this.address=userBuilder.address;
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this.age=userBuilder.age;
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this.mobile=userBuilder.mobile;
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this.maritalStatus=userBuilder.maritalStatus;
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this.occupation=userBuilder.occupation;
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}
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@Override
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public String toString() {
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return "User [firstName=" + firstName + ", lastName=" + lastName + ", address=" + address + ", age=" + age
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+ ", mobile=" + mobile + ", maritalStatus=" + maritalStatus + ", occupation=" + occupation + "]";
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}
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public static class UserBuilder
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{
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private String fname;
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private String lname;
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private String address;
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private int age;
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private String mobile;
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private String maritalStatus;
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private String occupation;
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public UserBuilder firstName(String lastName)
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{
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this.fname=lastName;
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return this;
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}
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public UserBuilder lastName(String lastName)
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{
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this.lname=lastName;
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return this;
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}
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public UserBuilder address(String address)
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{
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this.address=address;
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return this;
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}
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public UserBuilder age(int age)
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{
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this.age=age;
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return this;
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}
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public UserBuilder mobile(String mobile)
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{
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this.mobile=mobile;
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return this;
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}
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public UserBuilder maritalStatus(String maritalStatus)
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{
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this.maritalStatus=maritalStatus;
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return this;
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}
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public UserBuilder occupation(String occupation)
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{
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this.occupation=occupation;
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return this;
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}
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public User build() {
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User user=new User(this);
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//validateUserObject(user);
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return user;
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}
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private void validateUserObject(User user) {
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//Do some basic validations to check
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//if user object does not break any assumption of system
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}
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}
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}

‎settings.gradle‎

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rootProject.name = 'DesignPattern'
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include 'Singelton'
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include 'Factory'
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include 'Builder'
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