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public class FB implements CaretListener {
 
	int i=0;
	JLabel[] labels;
	JTextField field;
 
	FB(){
		JFrame frame=new JFrame("Falling bricks");
		labels=new JLabel[10];
		field=new JTextField(10);
		field.addCaretListener(this);
		field.setHorizontalAlignment(JTextField.CENTER);
		field.setBackground(Color.GREEN);
		field.setText("tr");
		frame.add(field);
 
		frame.setLayout(new GridLayout(11,1,0,0));
				for(int i=9;i>-1;i--){
			labels[i]=new JLabel("0",10);
			labels[i].setHorizontalAlignment(JLabel.CENTER);
			frame.add(labels[i]);
			}
		frame.pack();
		frame.setVisible(true);
 
	}
	public static void main(String[] args) {
		SwingUtilities.invokeLater(new Runnable(){
			public void run(){
				new FB();
				}
		});
 
	}
	@Override
	public void caretUpdate(CaretEvent e) {
		if((field.getText().length()==10)&&(i!=10)&&(i!=11)){
			labels[i].setText(field.getText());
			field.setText("");
			i++;
		}
		else if(i==10){field.setBackground(Color.BLACK);
		Timer t=new Timer(200, new ActionListener(){
			public void actionPerformed(ActionEvent e){
			field.setBackground(Color.RED);
			i=11;
			}
		});
		t.start();
		}
 
	}
 
}
 

Main.java:1: error: class FB is public, should be declared in a file named FB.java
public class FB implements CaretListener {
       ^
Main.java:1: error: cannot find symbol
public class FB implements CaretListener {
                           ^
  symbol: class CaretListener
Main.java:4: error: cannot find symbol
	JLabel[] labels;
	^
  symbol:   class JLabel
  location: class FB
Main.java:5: error: cannot find symbol
	JTextField field;
	^
  symbol:   class JTextField
  location: class FB
Main.java:36: error: cannot find symbol
	public void caretUpdate(CaretEvent e) {
	                        ^
  symbol:   class CaretEvent
  location: class FB
Main.java:8: error: cannot find symbol
		JFrame frame=new JFrame("Falling bricks");
		^
  symbol:   class JFrame
  location: class FB
Main.java:8: error: cannot find symbol
		JFrame frame=new JFrame("Falling bricks");
		                 ^
  symbol:   class JFrame
  location: class FB
Main.java:9: error: cannot find symbol
		labels=new JLabel[10];
		           ^
  symbol:   class JLabel
  location: class FB
Main.java:10: error: cannot find symbol
		field=new JTextField(10);
		          ^
  symbol:   class JTextField
  location: class FB
Main.java:12: error: cannot find symbol
		field.setHorizontalAlignment(JTextField.CENTER);
		                             ^
  symbol:   variable JTextField
  location: class FB
Main.java:13: error: cannot find symbol
		field.setBackground(Color.GREEN);
		                    ^
  symbol:   variable Color
  location: class FB
Main.java:17: error: cannot find symbol
		frame.setLayout(new GridLayout(11,1,0,0));
		                    ^
  symbol:   class GridLayout
  location: class FB
Main.java:19: error: cannot find symbol
			labels[i]=new JLabel("0",10);
			              ^
  symbol:   class JLabel
  location: class FB
Main.java:20: error: cannot find symbol
			labels[i].setHorizontalAlignment(JLabel.CENTER);
			                                 ^
  symbol:   variable JLabel
  location: class FB
Main.java:28: error: cannot find symbol
		SwingUtilities.invokeLater(new Runnable(){
		^
  symbol:   variable SwingUtilities
  location: class FB
Main.java:42: error: cannot find symbol
		else if(i==10){field.setBackground(Color.BLACK);
		                                   ^
  symbol:   variable Color
  location: class FB
Main.java:43: error: cannot find symbol
		Timer t=new Timer(200, new ActionListener(){
		^
  symbol:   class Timer
  location: class FB
Main.java:43: error: cannot find symbol
		Timer t=new Timer(200, new ActionListener(){
		            ^
  symbol:   class Timer
  location: class FB
Main.java:43: error: cannot find symbol
		Timer t=new Timer(200, new ActionListener(){
		                           ^
  symbol:   class ActionListener
  location: class FB
Main.java:35: error: method does not override or implement a method from a supertype
	@Override
	^
20 errors

Standard output is empty