java - 如何将变量从一个 JFrame 传递到另一个 JFrame

Question

我是 Java 新手。我试图自己找到解决方案，但不知道如何继续。

我有 2 个 Jframe (JF1,JF2) ，我需要将变量从 JF1 传递到 JF2

这是 JF1 的代码:注意:我需要值 x ，值 x 从 JTextfeild 获取。

谁能帮帮我

/*
 * JF1.java
 *
 * Created on 04 مايو, 2012, 09:01 م
 */

package finalpro;

import java.io.BufferedInputStream;
import javax.swing.JOptionPane;

/**
 *
 * @author  OmaR
 */
public class JF1 extends javax.swing.JFrame {

    /** Creates new form JF1 */
    public JF1() {
        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.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        JB1 = new javax.swing.JButton();
        JB3 = new javax.swing.JButton();
        JB2 = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Online Test Creater");

        JB1.setText("Make");
        JB1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                JB1ActionPerformed(evt);
            }
        });

        JB3.setText("Quit");
        JB3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                JB3ActionPerformed(evt);
            }
        });

        JB2.setText("Reset");
        JB2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                JB2ActionPerformed(evt);
            }
        });

        jLabel2.setText("Number Of Question");

        jTextField1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jTextField1MouseClicked(evt);
            }
        });

        jButton1.setText("Main");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 127, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(43, 43, 43)
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 64, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 50, Short.MAX_VALUE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 128, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(34, 34, 34)))
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(JB2)
                    .addComponent(JB3)
                    .addComponent(JB1)
                    .addComponent(jButton1))
                .addGap(30, 30, 30))
        );

        layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {JB1, JB2, JB3, jButton1});

        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(19, 19, 19)
                        .addComponent(jLabel1))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(31, 31, 31)
                        .addComponent(JB1)))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel2)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jButton1))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(JB2)
                        .addGap(18, 18, 18)
                        .addComponent(JB3)))
                .addContainerGap(37, Short.MAX_VALUE))
        );

        layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {JB1, JB2, JB3, jButton1});

        pack();
    }// </editor-fold>                        

    private void JB3ActionPerformed(java.awt.event.ActionEvent evt) {                                    
        // TODO add your handling code here:
        System.exit(0);
    }                                   

    private void JB2ActionPerformed(java.awt.event.ActionEvent evt) {                                    
        // TODO add your handling code here:
        jTextField1.setText("");

    }                                   

    private void JB1ActionPerformed(java.awt.event.ActionEvent evt) {                                    
        // TODO add your handling code here:

            JF1 JFBU = new JF1()   ;
            JF2 JCreate = new JF2();

            this.setVisible(false);
        int  z = Integer.parseInt(jTextField1.getText());


          if (z == 0)
            {
               JOptionPane.showMessageDialog(null, " You Enter 0 Please write anumber ");

                 }
          else
          {
             JCreate.setVisible(true);
          }  


    }                                   

    private void jTextField1MouseClicked(java.awt.event.MouseEvent evt) {                                         
        // TODO add your handling code here:
        JOptionPane.showMessageDialog(null, "The Max Number of Questions Is 10");
    }                                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        JFmain JFm = new JFmain();
        JFm.setVisible(true);
        this.setVisible(false);
    }                                        

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
               new JF1().setVisible(true);

            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton JB1;
    private javax.swing.JButton JB2;
    private javax.swing.JButton JB3;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration                   


}

我有 JF2，我需要在其上传递 Var z。

Answer 1

使用参数int z创建构造函数:

public class JF2 extends JFrame {
    private int z;

    public void setZ(int z) {
        this.z = z;
    }

    public int getZ() {
        return z;
    }

    public JF2(int z) {
        this.z = z;
    }
}

并在创建 JF2 -> JF2 jCreate = new JF2(z); 或使用 setter 时传递变量 z >jCreate.setZ(z);