//1. Creating strings
StringBuffer str = new StringBuffer("abc123");
System.out.println("Before Reversal:" + str);
//2. Setting the inversion parameter/position
int start = 1;
int end = 5;
//3. will need to reverse the character to intercept, the return value is String
String reverse = str.substring(start, end);
//4. To perform the reverse operation, you need to convert String to StringBuffer or StringBuilder first.
// Because String doesn't have a reverse() method.
StringBuffer str2 = new StringBuffer(reverse);
//5. Call the reverse method reverse()
str2.reverse();
//6. Replace the original character with the reversed character
str.replace(start,ent, String.valueOf(str2));
System.out.println("After Reversal:" + str);
