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public class ExerciseRunner {
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public static void main(String[] args) {
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System.out.println(GoodbyeMars.goodbyeMars());
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}
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}
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## Singleton Blueprint
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### Instructions
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You are given an incomplete singleton class. Complete the class to demonstrate your understanding of how the Singleton design pattern works. The Singleton pattern ensures that a class has only one instance and provides a global point of access to that instance.
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### Expected Class
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```java
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public class Singleton {
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public static Singleton instance;
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private Singleton() {
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// Initialization code
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}
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public static Singleton get???() {
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// Implementation to return the single instance
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}
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}
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```
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### Usage
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Here is a possible `ExerciseRunner.java` to test your class:
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```java
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public class ExerciseRunner {
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public static void main(String[] args) {
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// Get the only object available
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Singleton singleton = Singleton.getInstance();
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// Show the message
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singleton.showMessage();
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}
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}
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```
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### Expected Output
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```shell
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$ javac *.java -d build
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$ java -cp build ExerciseRunner
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Hello, I am a singleton!
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$
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```
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