public class Outprintln{
    
    public static void main(String[] agrs){
/*        byte[] d="abc美丽的向日葵".getBytes();
        System.out.println(d.length);
        String s = new String(d,0,7);
        System.out.println(s);
        
        String s="1234567890";
        MyString ms = new MyString();
        System.out.println(ms.getString(s));
*/        
        String regex = "\\djava\\w{1,}";
        String str1 = "8javaoook";// \d匹配数字：[0-9]
        String str2 = "9javaILoveYou";
    
        if(str1.matches(regex)){
            System.out.println(str1);
        }
        if(str2.matches(regex)){
            System.out.println(str2);
        }
    }
}
class MyString{
    public String getString(String s){
        StringBuffer str = new StringBuffer();
        for (int i = 0; i<s.length(); i++){
            if(i%2==0){
                char c = s.charAt(i);
                str.append(c);
            }
        }
        return new String(str);
    }
}