Builder pattern

Quick template code

 public class FullName {  
   private final String firstName;  
   private final String lastName;  
   public static class Builder{  
     private String firstName;  
     private String lastName;  
     public Builder(){}  
     public Builder firstName(String firstName){  
       this.firstName = firstName;  
       return this;  
     }  
     public Builder lastName(String lastName){  
       this.lastName = lastName;  
       return this;  
     }  
     public FullName build(){  
       return new FullName(this);  
     }  
   }  
   private FullName(Builder builder) {  
     firstName = builder.firstName;  
     lastName = builder.lastName;  
   }  
 }  

Client code

 FullName name = new FullName.Builder().firstName("Ming").lastName("Sun").build();