Java Builder模式构建MAP/LIST的实例讲解

我们在构建一个map时，要不停的调用put，有时候看着觉得很麻烦，刚好，看了下builder模式，觉得这思路不错，于是乎，照着用builder模式写了一个构建map的示例，

代码如下：

import java.util.hashmap;
import java.util.map;
 
public class mapbuilder<t> {
  
 public builder<t> b;
  
 public mapbuilder(builder<t> b){
  this.b = b;
 }
  
 public map<string,t> map(){
  return b.map;
 }
  
 public t get(string key){
  return b.map.get(key);
 }
 
 public static class builder<t>{
   
  public map<string, t> map;
   
  public builder(){
   map = new hashmap<string, t>();
  }
   
  public builder<t> map(string key, t value){
   map.put(key, value);
   return this;
  }
   
   
  public mapbuilder<t> build(){
   return new mapbuilder<t>(this);
  }
 }
  
 public static void main(string[] args) {
  mapbuilder<string> build = new mapbuilder.builder<string>().map("a", "b").build();
  system.out.println(build.get("a"));
 }
  
}

public class listbuilder<t> {
  
 public builder<t> b;
  
 public listbuilder(builder<t> b){
  this.b = b;
 }
  
 public list<t> list(){
  return b.list;
 }
  
 public t get(int index){
  return b.list.get(index);
 }
 
 public static class builder<t>{
   
  public list<t> list;
   
  public builder(){
   list = new arraylist<t>();
  }
   
  public builder<t> add(t value){
   list.add(value);
   return this;
  }
   
   
  public listbuilder<t> build(){
   return new listbuilder<t>(this);
  }
 }
  
 public static void main(string[] args) {
  listbuilder<string> build = new listbuilder.builder<string>().add("a").add("b").build();
  system.out.println(build.get(0));
 }
  
}

以上这篇java builder模式构建map/list的实例讲解就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。