public class HowMany {
    public String cc(){
        String str="abc";
        str=str+"123";
        str=str.substring(2,5);
        str=str.toUpperCase();
        return str.toString();
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        HowMany hw=new HowMany();
        hw.cc();//[color=#FF0000]调用此方法，创建了多少个String Object?[/color]    }
}