Reverse a String (using StringBuilder class) in java.
import java.util.*;
public class Strings {
public static void main(String args[]) {
StringBuilder sb = new StringBuilder("HelloWorld");
for(int i=0; i
int front = i;
int back = sb.length() - i - 1;
char frontChar = sb.charAt(front);
char backChar = sb.charAt(back);
sb.setCharAt(front, backChar);
sb.setCharAt(back, frontChar);
}
System.out.println(sb);
}
}
Write a program to print Fibonacci series of n terms where n is input by user :
0 1 1 2 3 5 8 13 21 .....
In the Fibonacci series, a number is the sum of the previous 2 numbers that came before it.
Take an array of numbers as input and check if it is an array sorted in ascending order.
Eg : { 1, 2, 4, 7 } is sorted in ascending order.
{3, 4, 6, 2} is not sorted in ascending order.
Input an email from the user. You have to create a username from the email by deleting the part that comes after ‘@’. Display that username to the user.
Example :
email = “mejona@gmail.com” ; username = “mejona”
email = “helloWorld123@gmail.com”; username = “helloWorld123”