JAVA Builder模式构建MAP的示例

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"));
	}
	
}