Need Help!:( Java problem

Hello,

I have to solve 3 java Problems, there actually simple but i'm stuck with it:(. Would be really grateful, if somebody could help me out.:)

1. Write a complete and syntactically correct Java class named FiveDigitNum

which receives as input on 5-digit number from the user, say 42338,

and separates the number into its individual digits and displays each digit

separated by 3 blank spaces, ie 4 2 3 3 8

2. Write a complete and syntactically correct Java program(class name Dollars)

which computes and outputs the conversion of an entered number of dollars

into currency denominations, as in 100s, 50s, 20s, 10s, 5s and 1s.

3. 1. Prompt the user for the coefficients of the quadratic equation,

and compute and output the roots R1 and R2.

Keep prompting the user to enter new coefficients until the user

enters 0 for the a coefficient, in which case pgm ends.