comptuer science help public void hitSave() {saved TextWindow = textWindow.save();}public void hitUndo() {textWindow.restore(savedTextWindow);public class Main(){public static void main(String[] args)(TextEditor textEditor = new TextEditor(new TextWindow());textEditor.write("This is XYZ design pattern");textEditor.write("in Java?\n");textEditor.hitSave();textEditor.write("This is SE class \n");textEditor.hitUndo();assertThat(textEditor.print()).isEqualTo("This is XYZ design pattern in Java\n");}}A) MementoB CommandChain of ResponsibilityD MediatorE) InterpreterF Iterator What is the behavioral design pattern used in the following Java code?public class TextEditor {private TextWindow textWindow;public TextEditor(TextWindow textWindow) {this.textWindow = textWindow;}}public class TextWindow (private StringBuilder currentText;public TextWindow() {this.currentText = new StringBuilder();}public void addText(String text) {currentText.append(text);}}}public class TextWindowState {private String text;public TextWindowState(String text) {this.text = text;}public String getText() {return text;}}private StringBuilder currentText;public TextWindowState save() {return new TextWindowState(currentText.toString());}public void restore(TextWindowState save) {currentText = new StringBuilder(save.getText());private TextWindowState saved TextWindow;public void hitSave() {saved TextWindow = textWindow.save();

“Since you have asked multiple questions, we will solve the first question for you. If you want any…

public void hitSave() { saved TextWindow = textWindow.save(); } public void hitUndo() { textWindow.restore(savedTextWindow); public class Main(){ public static void main(String[] args) ( TextEditor textEditor = new TextEditor(new TextWindow()); textEditor.write("This is XYZ design pattern"); textEditor.write("in Java?\n"); textEditor.hitSave(); textEditor.write("This is SE class \n"); textEditor.hitUndo(); assertThat(textEditor.print()).isEqualTo("This is XYZ design pattern in Java\n"); } } A) Memento B Command Chain of Responsibility D Mediator E) Interpreter Iterator

public void hitSave() { saved TextWindow = textWindow.save(); } public void hitUndo() { textWindow.restore(savedTextWindow); public class Main(){ public static void main(String[] args) ( TextEditor textEditor = new TextEditor(new TextWindow()); textEditor.write("This is XYZ design pattern"); textEditor.write("in Java?\n"); textEditor.hitSave(); textEditor.write("This is SE class \n"); textEditor.hitUndo(); assertThat(textEditor.print()).isEqualTo("This is XYZ design pattern in Java\n"); } } A) Memento B Command Chain of Responsibility D Mediator E) Interpreter Iterator

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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