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。