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Canvas canvas;
Cir cir = new Cir();
Rec rec = new Rec();
Tri tri = new Tri();
 
 
canvas.addFigure(cir);
 
abstract class Figure{
  abstract boolean overPeriphery();
  abstract void clicked();
  abstract  void display();
}
 
class Canvas{
  int x,y;
  ArrayList<Figure> fig;
  Canvas(int xpos, int ypos){
    x = xpos;
    y = ypos;
  }
 
  void addFigure(Figure f){
    fig.add(f);
  }
 
  void display(){
    /*
    for(int i = 0; i < fig.size(); i++){
      fig.display();
    }
    */
    for(Iterator it = fig.iterator() ; it.hasNext(); ){
      it.display();
    }
  }
}

Main.java:1: class, interface, or enum expected
Canvas canvas;
^
Main.java:2: class, interface, or enum expected
Cir cir = new Cir();
^
Main.java:3: class, interface, or enum expected
Rec rec = new Rec();
^
Main.java:4: class, interface, or enum expected
Tri tri = new Tri();
^
Main.java:7: class, interface, or enum expected
canvas.addFigure(cir);
^
5 errors

Standard output is empty