Valor não aparece na lista ao executar o programa

natojose · Dezembro 15, 2021, 7:53pm

Sempre que executo o programa ele não me da os valores dentro da lista, ela fica como se não existisse e nenhum valor é fornecido. O que eu queria saber era como fazer os valores aparecerem na lista que foi criada no JFrame. Obrigado!

package classes;

import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.AbstractListModel;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.ListSelectionModel;
import javax.swing.DropMode;

public class TelaContador extends JFrame {

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					TelaContador frame = new TelaContador();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public TelaContador() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 654, 406);
		JPanel contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		JSlider sliInicio = new JSlider();
		
		sliInicio.setValue(0);
		sliInicio.setMaximum(5);
		sliInicio.setBounds(78, 38, 200, 26);
		contentPane.add(sliInicio);
		
		JSlider sliFim = new JSlider();
		
		sliFim.setValue(6);
		sliFim.setMinimum(6);
		sliFim.setMaximum(20);
		sliFim.setBounds(78, 80, 200, 26);
		contentPane.add(sliFim);
		
		JSlider sliPasso = new JSlider();
		
		sliPasso.setValue(1);
		sliPasso.setMinimum(1);
		sliPasso.setMaximum(4);
		sliPasso.setBounds(78, 128, 200, 26);
		contentPane.add(sliPasso);
		
		JLabel lblNewLabel = new JLabel("In\u00EDcio");
		lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 16));
		lblNewLabel.setBounds(22, 41, 46, 14);
		contentPane.add(lblNewLabel);
		
		JLabel lblNewLabel_1 = new JLabel("Fim");
		lblNewLabel_1.setFont(new Font("Tahoma", Font.PLAIN, 16));
		lblNewLabel_1.setBounds(22, 87, 46, 14);
		contentPane.add(lblNewLabel_1);
		
		JLabel lblNewLabel_2 = new JLabel("Passo");
		lblNewLabel_2.setFont(new Font("Tahoma", Font.PLAIN, 16));
		lblNewLabel_2.setBounds(22, 129, 46, 14);
		contentPane.add(lblNewLabel_2);
		
		JLabel lblInicio = new JLabel("0");
		lblInicio.setFont(new Font("Tahoma", Font.PLAIN, 16));
		lblInicio.setBounds(288, 41, 46, 14);
		contentPane.add(lblInicio);
		
		JLabel lblFim = new JLabel("6");
		lblFim.setFont(new Font("Tahoma", Font.PLAIN, 16));
		lblFim.setBounds(288, 87, 46, 14);
		contentPane.add(lblFim);
		
		JLabel lblPasso = new JLabel("1");
		lblPasso.setFont(new Font("Tahoma", Font.PLAIN, 16));
		lblPasso.setBounds(288, 129, 46, 14);
		contentPane.add(lblPasso);
		
		JButton btnCont = new JButton("Contar");
	
		btnCont.setFont(new Font("Tahoma", Font.PLAIN, 18));
		btnCont.setBounds(99, 176, 89, 23);
		contentPane.add(btnCont);
		
		JList lstContar = new JList();
		lstContar.setBounds(517, 325, -158, -279);
		contentPane.add(lstContar);
		
		
		sliInicio.addChangeListener(new ChangeListener() {
			public void stateChanged(ChangeEvent e) {
				int i = sliInicio.getValue();
				lblInicio.setText(Integer.toString(i));
				
			}
		});
		
		sliFim.addChangeListener(new ChangeListener() {
			public void stateChanged(ChangeEvent e) {
				int f = sliFim.getValue();
				lblFim.setText(Integer.toString(f));
			}
		});
		
		sliPasso.addChangeListener(new ChangeListener() {
			public void stateChanged(ChangeEvent e) {
				int p = sliPasso.getValue();
				lblPasso.setText(Integer.toString(p));
			}
		});
		
		btnCont.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int i = sliInicio.getValue();
				int f = sliFim.getValue();
				int p = sliPasso.getValue();
				
				DefaultListModel lista = new DefaultListModel();
				
				for (int c = i; c <= f; c += p) {
					lista.addElement(c);
				}
				
				lstContar.setModel(lista);
				
			}
		});
	}
}

Diegotutubarao · Dezembro 29, 2021, 3:43pm

Nao entendi o que vc Queria
Mas fiz aparcer a tela faltava vc add no component

package view.antigas;

import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class TelaContador extends JFrame {

/**
 * Launch the application.
 */
public static void main(String[] args) {
	EventQueue.invokeLater(new Runnable() {
		public void run() {
			try {
				TelaContador frame = new TelaContador();
				frame.setVisible(true);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	});
}

/**
 * Create the frame.
 */
public TelaContador() {
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setBounds(100, 100, 654, 406);
	final JPanel contentPane = new JPanel();
	contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
	setContentPane(contentPane);
	contentPane.setLayout(null);
	
	final JSlider sliInicio = new JSlider();
	
	sliInicio.setValue(0);
	sliInicio.setMaximum(5);
	sliInicio.setBounds(78, 38, 200, 26);
	contentPane.add(sliInicio);
	
	final JSlider sliFim = new JSlider();
	
	sliFim.setValue(6);
	sliFim.setMinimum(6);
	sliFim.setMaximum(20);
	sliFim.setBounds(78, 80, 200, 26);
	contentPane.add(sliFim);
	
	final JSlider sliPasso = new JSlider();
	
	sliPasso.setValue(1);
	sliPasso.setMinimum(1);
	sliPasso.setMaximum(4);
	sliPasso.setBounds(78, 128, 200, 26);
	contentPane.add(sliPasso);
	
	JLabel lblNewLabel = new JLabel("In\u00EDcio");
	lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblNewLabel.setBounds(22, 41, 46, 14);
	contentPane.add(lblNewLabel);
	
	JLabel lblNewLabel_1 = new JLabel("Fim");
	lblNewLabel_1.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblNewLabel_1.setBounds(22, 87, 46, 14);
	contentPane.add(lblNewLabel_1);
	
	JLabel lblNewLabel_2 = new JLabel("Passo");
	lblNewLabel_2.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblNewLabel_2.setBounds(22, 129, 46, 14);
	contentPane.add(lblNewLabel_2);
	
	final JLabel lblInicio = new JLabel("0");
	lblInicio.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblInicio.setBounds(288, 41, 46, 14);
	contentPane.add(lblInicio);
	
	final JLabel lblFim = new JLabel("6");
	lblFim.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblFim.setBounds(288, 87, 46, 14);
	contentPane.add(lblFim);
	
	final JLabel lblPasso = new JLabel("1");
	lblPasso.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblPasso.setBounds(288, 129, 46, 14);
	contentPane.add(lblPasso);
	
	JButton btnCont = new JButton("Contar");

	btnCont.setFont(new Font("Tahoma", Font.PLAIN, 18));
	btnCont.setBounds(99, 176, 89, 23);
	contentPane.add(btnCont);
	
	final JList lstContar = new JList();
	//lstContar.setBounds(517, 325, -158, -279);
            lstContar.setBounds(325, 30, 158, 279);
	
            
	sliInicio.addChangeListener(new ChangeListener() {
		public void stateChanged(ChangeEvent e) {
			int i = sliInicio.getValue();
			lblInicio.setText(Integer.toString(i));
			
		}
	});
	
	sliFim.addChangeListener(new ChangeListener() {
		public void stateChanged(ChangeEvent e) {
			int f = sliFim.getValue();
			lblFim.setText(Integer.toString(f));
		}
	});
	
	sliPasso.addChangeListener(new ChangeListener() {
		public void stateChanged(ChangeEvent e) {
			int p = sliPasso.getValue();
			lblPasso.setText(Integer.toString(p));
		}
	});
	
	btnCont.addActionListener(new ActionListener() {
		public void actionPerformed(ActionEvent e) {
			int i = sliInicio.getValue();
			int f = sliFim.getValue();
			int p = sliPasso.getValue();
			
			DefaultListModel lista = new DefaultListModel();
			
			for (int c = i; c <= f; c += p) {
				lista.addElement(c);
			}
			
			lstContar.setModel(lista);
			contentPane.add(lstContar);
		}
	});
}

}

natojose · Dezembro 30, 2021, 2:02am

A minha lista não aparece na janela JFRAME quando eu executo o programa… ela está invisível pois o programa roda e não da erro, mas a lista com o resultado não aparece.

Diegotutubarao · Dezembro 31, 2021, 1:33pm

Tela01
Tela02
As duas telas aparecem usando esse codigo que eu consertei e mandei para vc

////
package view.antigas;

import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class TelaContador extends JFrame {

public static void main(String[] args) {
	EventQueue.invokeLater(new Runnable() {
		public void run() {
			try {
				TelaContador frame = new TelaContador();
				frame.setVisible(true);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	});
}


public TelaContador() {
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setBounds(100, 100, 654, 406);
	final JPanel contentPane = new JPanel();
	contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
	setContentPane(contentPane);
	contentPane.setLayout(null);
	
	final JSlider sliInicio = new JSlider();
	
	sliInicio.setValue(0);
	sliInicio.setMaximum(5);
	sliInicio.setBounds(78, 38, 200, 26);
	contentPane.add(sliInicio);
	
	final JSlider sliFim = new JSlider();
	
	sliFim.setValue(6);
	sliFim.setMinimum(6);
	sliFim.setMaximum(20);
	sliFim.setBounds(78, 80, 200, 26);
	contentPane.add(sliFim);
	
	final JSlider sliPasso = new JSlider();
	
	sliPasso.setValue(1);
	sliPasso.setMinimum(1);
	sliPasso.setMaximum(4);
	sliPasso.setBounds(78, 128, 200, 26);
	contentPane.add(sliPasso);
	
	JLabel lblNewLabel = new JLabel("In\u00EDcio");
	lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblNewLabel.setBounds(22, 41, 46, 14);
	contentPane.add(lblNewLabel);
	
	JLabel lblNewLabel_1 = new JLabel("Fim");
	lblNewLabel_1.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblNewLabel_1.setBounds(22, 87, 46, 14);
	contentPane.add(lblNewLabel_1);
	
	JLabel lblNewLabel_2 = new JLabel("Passo");
	lblNewLabel_2.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblNewLabel_2.setBounds(22, 129, 46, 14);
	contentPane.add(lblNewLabel_2);
	
	final JLabel lblInicio = new JLabel("0");
	lblInicio.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblInicio.setBounds(288, 41, 46, 14);
	contentPane.add(lblInicio);
	
	final JLabel lblFim = new JLabel("6");
	lblFim.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblFim.setBounds(288, 87, 46, 14);
	contentPane.add(lblFim);
	
	final JLabel lblPasso = new JLabel("1");
	lblPasso.setFont(new Font("Tahoma", Font.PLAIN, 16));
	lblPasso.setBounds(288, 129, 46, 14);
	contentPane.add(lblPasso);
	
	JButton btnCont = new JButton("Contar");

	btnCont.setFont(new Font("Tahoma", Font.PLAIN, 18));
	btnCont.setBounds(99, 176, 89, 23);
	contentPane.add(btnCont);
	
	final JList lstContar = new JList();
	//lstContar.setBounds(517, 325, -158, -279);
            lstContar.setBounds(325, 30, 158, 279);
	
            
	sliInicio.addChangeListener(new ChangeListener() {
		public void stateChanged(ChangeEvent e) {
			int i = sliInicio.getValue();
			lblInicio.setText(Integer.toString(i));
			
		}
	});
	
	sliFim.addChangeListener(new ChangeListener() {
		public void stateChanged(ChangeEvent e) {
			int f = sliFim.getValue();
			lblFim.setText(Integer.toString(f));
		}
	});
	
	sliPasso.addChangeListener(new ChangeListener() {
		public void stateChanged(ChangeEvent e) {
			int p = sliPasso.getValue();
			lblPasso.setText(Integer.toString(p));
		}
	});
	
	btnCont.addActionListener(new ActionListener() {
		public void actionPerformed(ActionEvent e) {
			int i = sliInicio.getValue();
			int f = sliFim.getValue();
			int p = sliPasso.getValue();
			
			DefaultListModel lista = new DefaultListModel();
			
			for (int c = i; c <= f; c += p) {
				lista.addElement(c);
			}
			
			lstContar.setModel(lista);
			contentPane.add(lstContar);
		}
	});
}

}

natojose · Janeiro 11, 2022, 1:17am

Obrigado @Diegotutubarao deu certo apesar de não conseguir achar o que você alterou no codigo, vou procurar aqui com mais cuidado.

Valor não aparece na lista ao executar o programa

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