图解设计模式-Template Method模式

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();
    }
}

public class CharDisplay extends AbstractDisplay {
    @Override
    public void open() {
        System.out.println("CharDisplay open");
    }

    @Override
    public void print() {
        System.out.println("CharDisplay print");
    }

    @Override
    public void close() {
        System.out.println("CharDisplay close");
    }
}

public class StringDisplay extends AbstractDisplay {

    private String string;
    private int width;

    public StringDisplay(String string,int width) {
        this.string=string;
        this.width=width;
    }
    @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("+");
    }
}

public class Main {
    public static void main(String[] args) {
        AbstractDisplay charDisplay = new CharDisplay();
        charDisplay.display();
        AbstractDisplay stringDisplay = new StringDisplay("testname",5);
        stringDisplay.display();
    }
}