package xyz.igorgee.imagecreator3d;

import java.io.File;

public class Model {
    String name;
    File location;
    String modelID;

    public Model(String name, File location) {
        this.name = name;
        this.location = location;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public File getLocation() {
        return location;
    }

    public void setLocation(File location) {
        this.location = location;
    }

    public String getModelID() {
        return modelID;
    }

    public void setModelID(String modelID) {
        this.modelID = modelID;
    }
}

@@ -113,22 +113,23 @@
 on;%0A    
-String
+Integer
  modelID
@@ -532,30 +532,31 @@
 %0A    public 
-String
+Integer
  getModelID(
@@ -617,22 +617,23 @@
 ModelID(
-String
+Integer
  modelID

Change modelId to type Integer