デザインパターン「Template Method」 ref: http://qiita.com/shoheiyokoyama/items/c2ce16b4f492cd014d50

AbstractDisplay.java

public abstract class AbstractDisplay {
    public abstract void open();
    public abstract void print();
    public abstract void close();
    //Template Method
    public final void display() {
        open();
        for (int i =0; i < 3; i++) {
            print();
        }
        close();
    }
}

CharDisplay.java

public class CharDisplay extends AbstractDisplay {
    private char ch;
    public CharDisplay(char ch) {
        this.ch = ch;
    }

    public void open() {
        System.out.print("***");
    }
    public void print() {
        System.out.print(ch);
    }
    public void close() {
        System.out.println("***");
    }

}

file4.java

***TTT***
+--------------+
|Design Pattern|
|Design Pattern|
|Design Pattern|
+--------------+
+---------------+
|Template Method|
|Template Method|
|Template Method|
+---------------+

Main.java

public static void main(String[] args) {

        //※
        AbstractDisplay cd = new CharDisplay('T');
        AbstractDisplay sd = new StringDisplay("Design Pattern");
        AbstractDisplay sd2 = new StringDisplay("Template Method");

        cd.display();
        sd.display();
        sd2.display();  
}

StringDisplay.java

public class StringDisplay extends AbstractDisplay {
    private String string;
    private int width;
    public StringDisplay(String string) {
        this.string = string;
        this.width = string.getBytes().length;
    }

    public void open() {
        printLine();

    }
    public void print() {
        System.out.println("|" + string + "|");

    }
    public void close() {
        printLine();

    }

    private void printLine() {
        System.out.print("+");
        for (int i = 0; i < width; i++) {
            System.out.print("-");
        }

        System.out.println("+");
    }

}