MapBuilder.java

package jp.s5r;

import java.util.HashMap;
import java.util.Map;

public class MapBuilder<K, V> {
  private Object[] objects;

  public MapBuilder(Object[] args) {
    if (args.length % 2 != 0) {
      throw new IllegalArgumentException();
    }

    objects = args;
  }

  public Map<K, V> build() {
    Map<K, V> map = new HashMap<K, V>();

    for (int i = 0; i < objects.length; i += 2) {
      map.put((K)objects[i], (V)objects[i + 1]);
    }

    return map;
  }
}

Test.java

package jp.s5r;

import java.util.Map;

public class Test {
  public static void main(String[] args) {
    Map<String, Integer> map =
        new MapBuilder<String, Integer>(new Object[] {
            "hoge", 10,
            "fuga", 20,
            "hahe", 30
        }).build();

    for (Map.Entry<String, Integer> entry : map.entrySet()) {
      System.out.println(
          "key: " + entry.getKey() + ", " + "value: " + entry.getValue()
      );
    }
  }
}