用Java写出一段string和stringbuffer的代码

class Test{
public static void main(String args[]){
String s=&#;&#;;
Systemoutprintln( new StringBuffer(s)reverse());
String s=&#;MicrosoftSun&#;;
StringBuffer sw=new StringBuffer(stoLowerCase());
StringBuffer ss=new StringBuffer(swsubstring())reverse();
Systemoutprintln(ss);
String s=&#;kico&#;;
StringBuffer st=new StringBuffer(s);
stinsert(s)insert(&#; &&#;);
Systemoutprintln(st);
}
}