Re: Help with Java Calculator Program

ram@zedat.fu-berlin.de (Stefan Ram) writes:


  Just for fun, here is a complete program with the above code
  in them method ?main?, except that ?getNext? was replaced by
  ?next?:

public class Main
{
  static class Counter
  { int value;
    void reset(){ this.value = 0; }
    void increment(){ if( value >= ++value )
      throw new java.lang.RuntimeException(); }
    public final java.lang.String toString()
    { return java.lang.String.valueOf( value ); }}

  static class Integer
  { int value;
    public Integer( final int value ){ this.value = value; }
    public boolean isGreaterThan( final int value )
    { return this.value > value; }}

  static final Counter counter = new Counter();

  static final java.util.ArrayList<Integer> list =
  new java.util.ArrayList<Integer>();

  static
  { list.add( new Integer( 1 ));
    list.add( new Integer( 11 ));
    list.add( new Integer( 11 ));

    java.lang.Runtime.getRuntime().addShutdownHook
    ( new java.lang.Thread
      ( new java.lang.Runnable()
        { public void run()
          { java.lang.System.out.println( counter ); }})); }

  static final java.util.Iterator<Integer> integers = list.iterator();

  public static void main( final java.lang.String[] args )
  {
    for( counter.reset(); integers.hasNext(); )
    if( integers.next().isGreaterThan( 9 ))counter.increment(); }}

  It prints ?2? because in the list, there are 2 numbers
  greater than 9. Thus, it has counted the numbers greater
  than 9.