Java program please.

Suppose today is an int variable, use switch statement to print out "no class today" if today equals 1 or 3, print out "class today" if today equals to 2, 4, 5, print out"weekend" if today equals 6, 0, and print out "wrong day" for other values. . Given an int variable grade, based on its value, assign a char variable letter Grade in the following way: 90 and above, 'A', 80 -89, 'B', etc. Write a program to read a string, or double . Write code snippet to find the first letter of a word, change it to upper case. o Write code snippet to find the first word of a line, the last word, the second word