Null pointer exception on hashmap

Processing Coding Questions
1

I’m initialising a hashmap in a constructor

Menu(float xx, float yy, float ww, float hh){
    x = xx;
    y = yy;
    w = ww;
    h = hh;
    xoff = 0;
    yoff = 0;
    toggle =0;
    
    values = new HashMap<String,Boolean>(){{
    put("drag",false);
    put("resize",false);
    put("slide",false);
    put("visible",false);
    put("border",false);
    put("menu",false);
    put("menuhover",false);
    }};
  }

however this returns a null pointer exception when called in an even listener

void event_listener(){
    
    if(drag&&!values.get("drag")){
      values.put("drag",true);
    }
    else if(!drag &&values.get("drag")){
      values.put("drag",false);
    }
    if(resize&&!values.get("resize")){
      values.put("resize",true);
    }
    else if(!resize &&values.get("resize")){
      values.put("resize",false);
    }
    if(slide&&values.get("slide")){
      values.put("slide",true);
    }
    else if(!slide &&values.get("slide")){
      values.put("slide",false);
    }
    if(visible&&!values.get("visible")){
      values.put("visible",true);
    }
    else if(!visible &&values.get("visible")){
      values.put("visible",false);
    }
    if(border && !values.get("border")){
      values.put("border",true);
    }
    else if(!border &&values.get("border")){
      values.put("border",false);
    }
    if(menu && !values.get("menu")){
      values.put("menu",true);
    }
    else if(!menu &&values.get("menu")){
      values.put("menu",false);
    }
    if(menuhover && !values.get("menuhover")){
      values.put("menuhover",true);
    }
    else if(!menuhover &&values.get("menuhover")){
      values.put("menuhover",false);
    }
  };

This only happens in one of my classes, and I dont understand why. Error only happens in the else if part of the code. Not the if part.

1 Like
2

Overloaded the constructor and failed to add it to all constructors.

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