Writing programs in Java

public class StringBufferDemo {

public static void main(String[] args) {

StringBuffer s=new StringBuffer("The weather is not very good recently, sometimes I haven't seen the moon for several days, but today the moon is in the sky, and the sky is cloudless");

StringBuffer s1=new StringBuffer("The moon is in the sky, and the sky is cloudless");

s=s.delete(s.lastIndexOf("The bright moon is in the sky, the blue sky is cloudless"),s.length());//Remove "The bright moon is in the sky, the blue sky is cloudless" and save it to StringBuffer s1 .

System.out.println(s);

s1=s1.delete(3,s1.length());//Delete all characters of s1 starting from the third character character.

System.out.println(s1);

StringBuffer s2=new StringBuffer(s.substring(7,10));//Get a substring s2 of s (from Take out 3 characters starting from the 7th one).

System.out.println(s2);

s2.reverse();//Reverse substring s2.

System.out.println(s2);

s1.append(s2);//Add s2 to the end of s1.

System.out.println("The length of the string '"+s1+"' is: "+s1.length());//Calculate the length L of the new string and print out the result.

}

}

The result is:

The weather has not been very good recently, and sometimes the moon cannot be seen for several days.

But today it is

the bright moon

, sometimes

sometimes,

the length of the string 'there was a bright moon at that time' is ：6