Java Builder模式构建MAP/LIST的实例讲解

Java Builder模式构建MAP/LIST的实例讲解

我们在构建一个MAP时，要不http://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 {

public Builder b;

public MapBuilder(Builder b){

this.b = b;

}

public Map map(){

return b.map;

}

public T get(String key){

return b.map.get(key);

}

public static class Builder{

public Map map;

public Builder(){

map = new HashMap();

}

public Builder map(String key, T value){

map.put(key, value);

return this;

}

public MapBuilder build(){

return new MapBuilder(this);

}

}

public static void main(String[] args) {

MapBuilder build = new MapBuilder.Builder().map("a", "b").build();

System.out.println(build.get("a"));

}

}

public class ListBuilder {

public Builder b;

public ListBuilder(Builder b){

this.b = b;

}

public List list(){

return b.list;

}

public T get(int index){

return b.list.get(index);

}

public static class Builder{

public List list;

public Builder(){

list = new ArrayList();

}

public Builder add(T value){

list.add(value);

return this;

}

public ListBuilder build(){

return new ListBuilder(this);

}

}

public static void main(String[] args) {

ListBuilder build = new ListBuilder.Builder().add("a").add("b").build();

System.out.println(build.get(0));

}

}

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