public JFontSelector() {
        initComponents();
        
        // gets font size value
        this.fontSize = lbl_display.getFont().getSize();
        
        // creates Font instance
        this.TimesNewRoman = new Font("Times New Roman", 0, getFontSize());
        this.CenturyGothic = new Font("Century Gothic", 0, getFontSize());
        this.CourierNew = new Font("Courier New", 0, getFontSize());
        this.Impact = new Font("Impact", 0, getFontSize());
        this.OldEnglish = new Font("Old English Text MT", 0, getFontSize());
    }