BlueJ Programs

BlueJ programs.

1. write a program to input a string and another string(word). find the frequency of second string in first string.( search for string in another string)
2.  write a program to input a string and a word to be searched in the first string and replace all the appearance of this word with a new word(in put this new word of same length as of word to be searched)
3. wap to input astring and arrange each letter lexicographically. 
4. wap to input a string and shift each letter to right except space. 
5. call by reference