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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"));
}
}
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