Template Pattern

@Test public void test() { AbstractDisplay d1 = new CharDisplay('H'); AbstractDisplay d2 = new StringDisplay("Hello, world."); AbstractDisplay d3 = new StringDisplay("안녕하세요."); d1.display(); d2.display(); d3.display(); }

package com.tistory.tazz009.pattern; public abstract class AbstractDisplay { public abstract void open(); public abstract void print(); public abstract void close(); public final void display() { open(); for (int i = 0; i < 5; i++) { print(); } close(); } }

package com.tistory.tazz009.pattern; public class CharDisplay extends AbstractDisplay { private char ch; public CharDisplay(char ch) { this.ch = ch; } @Override public void open() { System.out.print("<<"); } @Override public void print() { System.out.print(ch); } @Override public void close() { System.out.println(">>"); } }

package com.tistory.tazz009.pattern; public class StringDisplay extends AbstractDisplay { private String string; private int width; public StringDisplay(String string) { this.string = string; this.width = string.getBytes().length; } @Override public void open() { printLine(); } @Override public void print() { System.out.println("|" + string + "|"); } @Override public void close() { printLine(); } private void printLine() { System.out.print("+"); for (int i = 0; i < width; i++) { System.out.print("-"); } System.out.println("+"); } }