void (){
char[] s={'A','G','C','T'};
String st=String.valueOf(s);
System.out.println("This is : "+st);
}
>> This is : AGCT
String st="AGCT";
char[] s=st.toCharArray();
for (int i=0;i<st.length();i++){
System.out.println("This s[i]"+i+s[i]);
}
This s[i]0A
This s[i]1G
This s[i]2C
This s[i]3T