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脚本之家。
