To slove your problem,i don';t think it's
difficult.<br>For your first quesiton,use java.io class to get the
input which you input  from keyboard.And use some
methods to change to the form which you want.<br>Be
carefull that ,which the System.in get is a string,so you
should use ,such like parseInt,or other to chage into
the int or float.

import java.io.*;public class G{public static
void main(String[] args){<br>System.out.println("Grade
is "
+<br>(g("Quizes")*0.3+g("Homework")*0.2+g("Cummulative")*0.3+g("Midterm")*0.2));\
}<br>public static double g(String s){<br>StreamTokenizer t =
new StreamTokenizer(new
InputStreamReader(System.in));<br>try{System.out.println("Enter score for
"+s+"...");t.nextToken();}<br>catch
(IOException e){System.out.println(e);}return
t.nval;}}<br><br>Now your homework is to figure out the spacing...