Ir para outra tela e fechar a janela

Posta o código pra gente ver como você implementou.

Não estou conseguindo postar

Quando eu coloco o código diz que os usuários novo só pode mandar mensagens para dois contatos

package CADASTRO;

import Principal.principal;

/**
*

• @author Ademir
  */
  public class Cadastro extends javax.swing.JFrame {

  /**

  • Creates new form Cadastro
    */
    public Cadastro() {
    initComponents();
    }

  /**

  • This method is called from within the constructor to initialize the form.

  • WARNING: Do NOT modify this code. The content of this method is always

  • regenerated by the Form Editor.
    
    */
    
    @SuppressWarnings(“unchecked”)
    
    // 
    
    private void initComponents() {
    

    jPanel1 = new javax.swing.JPanel();
    
    jButton1 = new javax.swing.JButton();
    
    jLabel1 = new javax.swing.JLabel();
    
    jTextField1 = new javax.swing.JTextField();
    
    jScrollPane1 = new javax.swing.JScrollPane();
    
    jTable1 = new javax.swing.JTable();
    
    button1 = new java.awt.Button();
    
    button2 = new java.awt.Button();
    
    jButton2 = new javax.swing.JButton();
    

    setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
    setPreferredSize(new java.awt.Dimension(1020, 540));

    jPanel1.setBackground(new java.awt.Color(153, 153, 255));

    jButton1.setText(“NOVO CLIENTE”);

    jLabel1.setText(“PESQUISA CLIENTE”);

    jTable1.setAutoCreateRowSorter(true);
    
    jTable1.setModel(new javax.swing.table.DefaultTableModel(
    
    new Object [][] {
    
    {null, null, null, null},
    
    {null, null, null, null},
    
    {null, null, null, null},
    
    {null, null, null, null}
    
    },
    
    new String [] {
    
    “CLIENTE”, “TELEFONE”, “PLACA DO VEÍCULO”, “DATA DO CADASTRO”
    
    }
    
    ));
    
    jScrollPane1.setViewportView(jTable1);
    

    button1.setLabel(“Sair”);
    
    button1.addActionListener(new java.awt.event.ActionListener() {
    
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    
    button1ActionPerformed(evt);
    
    }
    
    });
    

    button2.setLabel(“Salvar”);

    jButton2.setText(“Voltar Principal”);
    
    jButton2.addActionListener(new java.awt.event.ActionListener() {
    
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    
    jButton2ActionPerformed(evt);
    
    }
    
    });
    

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    
    jPanel1.setLayout(jPanel1Layout);
    
    jPanel1Layout.setHorizontalGroup(
    
    jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addContainerGap()
    
    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 798, Short.MAX_VALUE)
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addComponent(jButton1)
    
    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    
    .addComponent(jButton2)
    
    .addGap(116, 116, 116)
    
    .addComponent(button1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addComponent(button2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addComponent(jLabel1)
    
    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
    
    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 187, javax.swing.GroupLayout.PREFERRED_SIZE)))
    
    .addGap(0, 0, Short.MAX_VALUE)))
    
    .addContainerGap())
    
    );
    
    jPanel1Layout.setVerticalGroup(
    
    jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addGroup(jPanel1Layout.createSequentialGroup()
    
    .addContainerGap()
    
    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
    
    .addComponent(jButton1)
    
    .addComponent(jButton2))
    
    .addComponent(button1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    
    .addGap(18, 18, 18)
    
    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
    
    .addComponent(jLabel1)
    
    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    
    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
    
    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 240, javax.swing.GroupLayout.PREFERRED_SIZE)
    
    .addGap(2, 2, 2)
    
    .addComponent(button2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
    
    .addContainerGap(18, Short.MAX_VALUE))
    
    );
    

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    
    getContentPane().setLayout(layout);
    
    layout.setHorizontalGroup(
    
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    
    );
    
    layout.setVerticalGroup(
    
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    
    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    
    );
    

    pack();
    }//

  private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
  
  new principal().setVisible(true);
  
  System.exit(0); // TODO add your handling code here:
  
  }
  

Mas como que faço para fechar somente a tela ?

Se para abrir você invoca o método setVisible(true), para fechar é só fazer o contrário.