java界面应用程序设计——往组合框中添加内容。

JComboBox[] jco=new JComboBox[3];
        Font fnt=new Font("宋体",Font.PLAIN+Font.BOLD,20);
        String[] year=new String[20];
        String[] month=new String[12];
        String[] day=new String[31];
        for(int i=0;i<31;i++)
        {
            if(i<20)
                year[i]=""+(1990+i);
            if(i<12)
                month[i]=""+(i+1);
            day[i]=""+(i+1);
        }
        jco[0]=new JComboBox<String>(year);                 //创建3个组合框对象
        jco[1]=new JComboBox<String>(month);
        jco[2]=new JComboBox<String>(day);