How to use printf to repeat a string in java?

Need a method to determine if two strings are palindromes of each other.  Write the declaration (header) for this method only. ] Java Programming

For this assignment, you must implement the ElGamal Public-Key Encryption scheme with any programming language that you are comfortable with. The recommendation is to use C/C++ or Java. You can accomplish this assignment individually or by forming a team of 2 students. Alternatively, you can work with your team members of the previous assignment. Your program should get the "key size" from the user in terms of number of bits (for instance, 64, 128, etc). Based on the size, use Fermat or Miller-Rabin primality test algorithm to define your large prime number. You can use the existing programming packages to find a generator of your finite field. Your program should then initialize a pair of key, i.e., private and public keys. For the computations, utilize the Square-and Multiply algorithm. In fact, your program should get a plaintext from the user to perform encryption (generating the ciphertext from the plaintext) and decryption (generating the original plaintext from the ciphertext).…

Write a program that accepts numbers.  If the number is non- negative, it saves the square root of the number; otherwise it saves the square of the number. After processing these numbers, print all the elements c++ bring a brief description (pseudocode). programming language c++