import java.util.*;class GraphicChar {   char c;   String fontFace;   public GraphicChar(char c, String fontFace) { this.c = c; this.fontFace = fontFace; }   public void printAtPosition(int x, int y)   { System.out.printf("Printing '%c' in '%s' at position %d:%d.\n", c, fontFace, x, y); }}class GraphicCharFactory {   HashMap<String, GraphicChar> pool = new HashMap<String, GraphicChar>(); // the Flyweights   public int getNum() { return pool.size(); }   public GraphicChar get(Character c, String fontFace) {       GraphicChar gc;       String key = c.toString() + fontFace;       if ((gc = pool.get(key)) != null) {           return gc;       } else {           gc = new GraphicChar(c, fontFace);           pool.put(key, gc);           return gc;       }   }}class FlyWeightExample {   public static void main(String[] args) {       GraphicCharFactory cf = new GraphicCharFactory();       // Compose the text by storing the characters as objects.       ArrayList<GraphicChar> text = new ArrayList<GraphicChar>();       text.add(cf.get('H', "Arial"));    // 'H' and "Arial" are called intrinsic information       text.add(cf.get('e', "Arial"));    // because it is stored in the object itself.       text.add(cf.get('l', "Arial"));       text.add(cf.get('l', "Arial"));       text.add(cf.get('o', "Times"));       // See how the Flyweight approach is beginning to save space:       System.out.printf("CharFactory created only %d objects for %d characters.\n", cf.getNum(), text.size());       int x=0, y=0;       for (GraphicChar c: text) {        // Passing position as extrinsic information to the objects,           c.printAtPosition(x++, y);      // as a top-left 'A' is not different to a top-right one.       }   }}