Carey Brown

What data type is cornflower? Where is it loaded?

You have a loop loading 30 images but those are not being added to the JScrollPane.

What is the program doing? What are you expecting it to do?

Welcome to The Ranch!

We would prefer that you cut and paste your code into a post rather than a screen snapshot.

In your screen snapshot the path starts with "first:". What is that? Is that specific to Visual Studio?

What is the absolute path to your symbolic link (shortcut)? What path does the link refer to?

This has been enlightening. Here's both together with some timing.
import java.util.Optional; import java.util.Spliterator; import java.util.concurrent.atomic.AtomicReference; import java.util.stream.IntStream; import java.util.stream.Stream; public class StreamLastElement { public static void main( String[] args ) { long start, stop; start = System.currentTimeMillis(); usingSpliterator(); stop = System.currentTimeMillis(); System.out.printf( "%-12s %s%n", "Spliterator", duration(start,stop) ); start = System.currentTimeMillis(); sequential(); stop = System.currentTimeMillis(); System.out.printf( "%-12s %s%n", "Sequential", duration(start,stop) ); } public static void usingSpliterator() { // Deliberately setting up a very big, very slow stream... var stream = IntStream.range( 1, 1_000_000_000 ).mapToObj( n -> { // System.out.println( "Evaluating element " + n + " in thread " // + Thread.currentThread().getName() ); // try // { // Thread.sleep( 1000 ); // } // catch( InterruptedException e ) // { // throw new RuntimeException( e ); // } return n; } ); var lastStream = streamWithLastElement( stream ); System.out.println( "Result: " + lastStream.toList() ); } public static <T> Stream<T> streamWithLastElement( Stream<T> in ) { return lastElementFrom( in.parallel().spliterator() ).stream(); } private static <T> Optional<T> lastElementFrom( Spliterator<T> split ) { var subsplit = split.trySplit(); if( subsplit != null ) { // System.out.println( "split: " + split.estimateSize() // + ", subsplit: " + subsplit.estimateSize() ); return lastElementFrom( split ) .or( () -> lastElementFrom( subsplit ) ); } else { // System.out.println( // "No further split, size=" + split.estimateSize() ); var last = new AtomicReference<T>(); split.forEachRemaining( t -> last.set( t ) ); return Optional.ofNullable( (T)last.get() ); } } public static void sequential() { var stream = IntStream.range( 1, 1_000_000_000 ).mapToObj( n -> n ); // var stream = Stream.of( "first", "middle", "last" ); var lastStream = streamWithLastElement2( stream ); System.out.println( "Result: " + lastStream.toList() ); } public static <T> Stream<T> streamWithLastElement2( Stream<T> in ) { return Stream .ofNullable( in.reduce( ( acc, ele ) -> ele ).orElse( null ) ); } private static String duration( long start, long stop ) { long millis = stop - start; long hours = millis / (60L * 60L * 1_000L); millis %= (60L * 60L * 1_000L); long minutes = millis / (60L * 1_000L); millis %= (60L * 1_000L); long seconds = millis / (1_000L); millis %= 1_000L; return String.format( "%02d:%02d:%02d.%03d", hours, minutes, seconds, millis ); } }
Output:
Result: [999999999] Spliterator  00:00:00.007 Result: [999999999] Sequential   00:00:02.547

This might be an example of an anonymous class with a field, though it also has a lambda feature.
import java.util.List; import java.util.function.Consumer; public class AnonymousClass { static List<String> ones = List.of( "one", "two", "three", "four" ); static List<String> tens = List.of( "ten", "twenty", "thirty", "forty" ); public static void main( String[] args ) { ones.forEach( new Consumer<Object>() { int num = 0; public void accept( Object s ) { System.out.println( ++num + "  " + s ); } }::accept ); tens.forEach( new Consumer<Object>() { int num = 0; public void accept( Object s ) { System.out.println( ++num + "  " + s ); } }::accept ); } }

Fikri Harlov wrote:Whenever I need a class with fields rather than a simple function like a lambda.

@Fikri, I think you may have a valid point but I'm having a hard time coming up with a legitimate example. Could you please provide one?

Although... I was trying to find an example in my source code archive and only came up with examples like this. This was NOT implemented as an ANONYMOUS class because the constructor takes a parameter so it could be used in more than one place.
private class DirectionAction extends AbstractAction { Direction direction; public DirectionAction( Direction direction ) { this.direction = direction; } public void actionPerformed( ActionEvent evt ) { if( directionPending == null ) directionPending = direction; } }

touché

I might suggest a different approach.  The problem with your approach is that if there was something beneath the circle  you drew then that would be erased also. If you drew the circle on it's own buffered image and then have paint() display the combined buffer images then you could just remove the one BufferedImage or effectively use the alpha value and set the pixels to transparent.

I suspect this:
Grafica.tela.repaint();
because it is called after you do the erase.

Can you show us the code for this?

Does your product look like this:
Product@6a9cbbe

If so, the you are missing the Product.toString() method.

I can't compile this without the Product source code.

Preferred size is the starting point for the size a layout manager will use if possible. This size may be reduced due to constraints placed by other components but should not be reduced below Minimum size.

You'd need to start with a clear specification as to what constitutes a valid String. Only then can you decide on a technique for implementation and test cases.

"Close" is the last menu item in what would have been the "File" menu.