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/* In this example, TextEditor uses different ITextState implementations * to alter how text is formatted based on the current state. * When the state changes (e.g., to bold or italic), the TypeText method * formats the text according to the rules defined in the current state. * This approach cleanly separates the concerns of text formatting from the * editor logic, making it easy to add new styles or modify existing ones * without changing the TextEditor class. */ TextEditor editor = new TextEditor(); // Typing in normal state Console.WriteLine(editor.TypeText("This is normal text.")); // Change state to bold editor.SetState(new BoldTextState()); Console.WriteLine(editor.TypeText("This is bold text.")); // Change state to italic editor.SetState(new ItalicTextState()); Console.WriteLine(editor.TypeText("This is italic text."));