can't compile the class XYZApp.java int the molecule viewer applet

can't compile the class XYZApp.java in the molecule viewer.

This is for the platforms : WIN95 and Solaris

Error message :

XYZApp.java:63: Exception java.io.IOException must be caught, or it must be declared in the throws clause of this method.
            switch (st.nextToken()) {
                                ^
XYZApp.java:86: Exception java.lang.Exception must be caught, or it must be declared in the throws clause of this method.
            throw new Exception(st.toString());
            ^
XYZApp.java:340: Exception java.lang.InterruptedException must be caught, or it must be declared in the throws clause of this method.
            wait();
                ^
3 errors
Exit 1