public static void main(String args[]) {
    Employee e1 = Employee.builder(1234, "Marcus Chiu")
                              .comment("hello, world!")
                              .description("this is the most talented guy in the entire world")
                              .build();
    Employee e2 = Employee.builder(1235, "Erina Chiu")
                              .description("sister of marcus chiu")
                              .build();
}

public class Employee {
 
    // required
    private Integer id;
    private String name;
 
    // optional
    private String description;
    private String comment;
 
	public static EmployeeBuilder build(Integer id, String name) {
		return new EmployeeBuilder(id, name);
	}
 
    public static class EmployeeBuilder {
        private Integer id;
        private String name;
        private String description;
        private String comment;
 
        public EmployeeBuilder(Integer id, String name) {
            this.id = id;
            this.name = name;
        }
 
        public EmployeeBuilder description(String description) {
            this.description = description;
            return this;
        }
 
        public EmployeeBuilder comment(String comment) {
            this.comment = comment;
            return this;
        }
 
        public Employee build() {
            Employee e = new Employee();
            e.id = this.id;
            e.name = this.name;
            e.description = this.description;
            e.comment = comment;
            return e;
        }
    }
}