Your theme posted here is interesting. Min/max, combinatoric algorithms.
Line public static void main(String[] args); change to
public static void main(String[] args){
Add }} at end of program.
Download from http://www.netbeans.org/ NetBans IDE 6.5, select Java SE 37 MB.
and Java SE Development Kit (JDK) 6 Update 11 from http://java.sun.com/javase/downloads/index.jsp ,

or

JDK 6 Update 11 with NetBeans 6.5 from http://java.sun.com/javase/downloads/index.jsp .
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Install and work.
Advanced editor show to You all wrong points in code before compiling.