private void setBreakableLines() {
        for (int i = 0; i < program.size(); i++) {
            if (program.getCode(i).getClass() == LineCode.class && ((LineCode) program.
                                                                    getCode(i)).
                    getLineNumber() > 0) {
                sourceLines.get(((LineCode) program.getCode(i)).getLineNumber()).
                        setAsPossibleBreakPoint();
            }
        }
    }