第十九次发博不知道用什么标题好

public class Kettle{
    int volume;
    public Kettle(int water){
    volume = water;
  }
 
public int heatingWater(int needWater){
     int needWater1=0;
     if(needWater>volume)
      System.out.println("装不下");
    }
        else {
            needWater1=needWater-2;
            System.out.println(nedWater1);
            }

            return needWater1;
    }

public static void main(String[] args){
    
    Kettle k1 = new kettle(60);
    k1.heatingWater(40);
}