class Zyzf

{

    public static void main(String[] args)

    {

        System.out.println("\"hello\" \"world\"");//使后面的字符意义改变

        System.out.println("hello \n world");//代表换行

        System.out.println("hello \t world");//代表一个table键

        System.out.println("hello \b world");//代表回退

    }

}

class Ljzf

{

    public static void main(String[] args)

    {

          int num1 = 23;

          byte num2 = 67;

          System.out.println(""+"num1:"+num1+"num2:"+num2);

    }

}