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  1. package com.company;
  2.  
  3. import javax.swing.*;
  4. import javax.swing.event.ChangeEvent;
  5. import javax.swing.event.ChangeListener;
  6. import java.awt.*;
  7. import java.awt.event.ActionEvent;
  8. import java.awt.event.ActionListener;
  9.  
  10. public class Main {
  11.  
  12.     public static void main(String[] args) {
  13.         JFrame jFrame = new JFrame("This is my app");
  14.         JSpinner jSpinner = new JSpinner();
  15.         JLabel jLabel = new JLabel();
  16.         JButton jButton = new JButton("result");
  17.         SpinnerNumberModel spinnerNumberModel = new SpinnerNumberModel(0, 0, 9,1);
  18.  
  19.         jSpinner.addChangeListener(new ChangeListener() {
  20.             @Override
  21.             public void stateChanged(ChangeEvent e) {
  22.                 Object number = jSpinner.getValue();
  23.                 for(int i = 0; i < (int)number; i++){
  24.                     for(int j = 0; j < i + 1; j++){
  25.                         jLabel.setText(jSpinner.getValue());
  26.                     }
  27.                     jLabel.setText("\n");
  28.                 }
  29.             }
  30.         });
  31.  
  32.  
  33.         jSpinner.setModel(spinnerNumberModel);
  34.  
  35.         jFrame.setDefaultCloseOperation(jFrame.EXIT_ON_CLOSE);
  36.         jFrame.setLayout(new FlowLayout());
  37.         Toolkit toolkit = Toolkit.getDefaultToolkit();
  38.         Dimension dimension = toolkit.getScreenSize();
  39.         jFrame.setBounds(dimension.width/2 - 250,dimension.height/2 - 150, 500, 300);
  40.         jFrame.setLocationRelativeTo(null);
  41.         jFrame.add(jSpinner);
  42.         jFrame.add(jButton);
  43.         jFrame.add(jLabel);
  44.         jFrame.setVisible(true);
  45.     }
  46. }
  47.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:25: error: incompatible types: Object cannot be converted to String
                        jLabel.setText(jSpinner.getValue());
                                                        ^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error
stdout 
Standard output is empty
https://ideone.com/CT2T3F
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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