Creating and naming GameObjects in Unity - Practice Exercises

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Unity C# code?

Consider the following Unity C# script attached to an empty GameObject. What will be the name of the newly created GameObject printed in the console?

Unity

using UnityEngine;

public class CreateObject : MonoBehaviour {
    void Start() {
        GameObject newObj = new GameObject("Player");
        Debug.Log(newObj.name);
    }
}

A ""

B "GameObject"

C "Player"

D "newObj"

💡 Hint

Look at how the GameObject is created and what name is passed to its constructor.

The GameObject constructor takes a string parameter that sets the name of the object. So the name will be exactly "Player".

🧠 Conceptual

intermediate

Which method creates a GameObject with a specific name in Unity?

In Unity C#, which of the following methods correctly creates a new GameObject and sets its name to "Enemy"?

A GameObject enemy = GameObject.Create("Enemy");

B GameObject enemy = new GameObject("Enemy");

C GameObject enemy = new GameObject(); enemy.name = "Enemy";

D GameObject enemy = GameObject.Instantiate("Enemy");

💡 Hint

Check which constructor or method allows passing a name string directly.

The GameObject constructor can take a string to set the name immediately. Option B creates a GameObject but sets the name after creation, which is valid but not the direct method asked.

🔧 Debug

advanced

Why does this code throw a NullReferenceException?

Examine the code below. Why does it throw a NullReferenceException at runtime?

Unity

using UnityEngine;

public class CreateAndName : MonoBehaviour {
    void Start() {
        GameObject obj;
        obj.name = "NPC";
    }
}

A Because name is a read-only property and cannot be set.

B Because "NPC" is an invalid name for a GameObject.

C Because Start() method cannot create or name GameObjects.

D Because obj is declared but never initialized, so obj is null when setting name.

💡 Hint

Think about what happens if you try to use a variable that has no object assigned.

The variable obj is declared but not assigned any GameObject instance, so it is null. Trying to access obj.name causes a NullReferenceException.

📝 Syntax

advanced

Which option correctly creates and names a GameObject in one line?

Which of the following lines of code correctly creates a new GameObject named "Boss" in Unity?

A GameObject boss = new GameObject("Boss");

B GameObject boss = new GameObject; boss.name = "Boss";

C GameObject boss = GameObject.Create("Boss");

D GameObject boss = new GameObject(); boss.name("Boss");

💡 Hint

Remember the syntax for calling constructors in C#.

Option A uses the correct constructor syntax with parentheses and a string argument. Option A misses parentheses, C uses a non-existent method, and D tries to call name as a method.

🚀 Application

expert

How many GameObjects are created and what are their names?

Analyze the following Unity C# code snippet. How many GameObjects are created and what are their names?

Unity

using UnityEngine;

public class MultiCreate : MonoBehaviour {
    void Start() {
        GameObject a = new GameObject("Alpha");
        GameObject b = new GameObject();
        b.name = "Beta";
        GameObject c = new GameObject();
    }
}

A 3 GameObjects: "Alpha", "Beta", "New GameObject"

B 3 GameObjects: "Alpha", "Beta", "GameObject"

C 2 GameObjects: "Alpha", "Beta"

D 3 GameObjects: "Alpha", "Beta", "" (empty string)

💡 Hint

Remember the default name assigned when no name is set explicitly.

The first GameObject is named "Alpha" by constructor. The second is created unnamed but then named "Beta". The third is created unnamed and keeps the default name "New GameObject".