intersection.java

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;

/**
 * @author danushka
 */
public class test {
  public static void main(String[] args) {
    JsonArray arr1 = new JsonArray();
    JsonArray arr2 = new JsonArray();

    for (int i = 0; i < 5; i++) {
      JsonObject jsonObject = new JsonObject();
      jsonObject.addProperty("id",i);
      jsonObject.addProperty("name","a_"+i);
      jsonObject.addProperty("age",i);
      arr1.add(jsonObject);
    }

    for (int i = 3; i < 8; i++) {
      JsonObject jsonObject = new JsonObject();
      jsonObject.addProperty("id",i);
      jsonObject.addProperty("name","a_"+i);
      jsonObject.addProperty("age",i);
      arr2.add("{'name': 'abc'}");
      arr2.add(jsonObject);
    }

    JsonArray result = intersection(arr1, arr2, "id", "id");
    result.forEach(System.out::println);

  }

  private static JsonArray intersection(JsonArray arr1, JsonArray arr2, String columnName1, String columnName2){
    JsonArray result = new JsonArray();
    arr1.forEach((element1) -> {
      if(element1.getAsJsonObject().has(columnName1)){
        arr2.forEach((element2) -> {
          if (element2.getAsJsonObject().has(columnName2)){
            if(element1.getAsJsonObject().get(columnName1).equals(element2.getAsJsonObject().get(columnName2))){
              result.add(element2);
            }
          }
        });
      }
    });
    return result;
  }
}