add final key word to the constant
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@ -7,7 +7,7 @@ import java.util.HashMap;
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import java.util.HashSet;
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public class TodoItemManager {
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private static String TODO_LIST_SAVE_NAME = "todo-list.json";
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private static final String TODO_LIST_SAVE_NAME = "todo-list.json";
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private static TodoItemManager ourInstance;
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