package example.template;

/***

 * 抽象类AbstractDisplay 其中抽象方法交给子类去实现

 * @author Administrator

 *

 */

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 example.template;

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.print(">>");

	}

}

package example.template;

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() {

		printLength();

	}

	private void printLength() {

		System.out.print("+");

		for(int i = 0; i < width; i++) {

			System.out.print("-");

		}

		System.out.println("+");

	}

	@Override

	public void print() {

		System.out.println("|"+string+"|");

	}

	@Override

	public void close() {

		printLength();

	}

}

package example.template;

public class Main {

	public static void main(String[] args) {

		//在父类中定义处理流程，在子类中具体实现，就是Template(模板)模式

		AbstractDisplay abstractDisplay = new CharDisplay('H');

		AbstractDisplay abstractDisplay2 = new StringDisplay("HelloWworld");

		abstractDisplay2.display();

		abstractDisplay.display();

	}

}