如何将值加载到JTable中，以便在打开表单时显示以前的值？

Question

我需要一些帮助。是为了我的学校项目。仅供参考，我使用过的一些符号:rbtn=radiobutton、tb=textfields、lbl=label

public class Customer extends javax.swing.JFrame {
String gender;
int year = Calendar.getInstance().get(Calendar.YEAR);
int month = Calendar.getInstance().get(Calendar.MONTH);
int day = Calendar.getInstance().get(Calendar.DAY_OF_MONTH);

int m=10; //array memory size

String[] name = new String[m];
String[] age = new String[m];
String[] genderm = new String [m];
String[] id = new String [m];
String[] mobile = new String [m];
String[] email = new String [m];
String[] address = new String [m];
String[] date = new String [m];
String[] photo = new String[m];

public Customer() {
    initComponents();
    tbdate.setText(day+"/"+(month+1)+"/"+year);
    lblphoto.setIcon(null);              
}     

private void btncreateActionPerformed(java.awt.event.ActionEvent  evt)      {                                          
    // TODO add your handling code here:
    if (rbtnmale.isSelected()){
        gender = "Male";
    }
    else if (rbtnfemale.isSelected()){
        gender = "Female";
    }
    DefaultTableModel model = (DefaultTableModel) jtablecustinfo.getModel();
    model.addRow(new Object[]{tbname.getText(),tbage.getText(),gender,tbid.getText(),tbmobile.getText(),tbemail.getText(),tbaddress.getText(),tbdate.getText(),lblphoto.getIcon()});

    for(int i=0;i<m;i++){
    name[i]=tbname.getText();
    age[i] = tbage.getText();
    genderm[i]=gender;
    id[i]=tbid.getText();
    mobile[i]=tbmobile.getText();
    email[i]=tbemail.getText();
    address[i]=tbaddress.getText();
    date[i]=tbdate.getText();
    photo[i]= tbimage.getText();;
    }

    //Reset everything after creation
    JOptionPane.showMessageDialog(null,"Successfully Created Customer");
    tbname.setText("");
    tbage.setText("");
    tbid.setText("");
    tbmobile.setText("");
    tbemail.setText("");
    tbaddress.setText("");
    tbdate.setText("");
    rbtnmale.setSelected(false);
    rbtnfemale.setSelected(false);
    tbdate.setText(day+"/"+(month+1)+"/"+year);
    gender = "";
    tbimage.setText("");
    lblphoto.setText("          -Import photo-");
    lblphoto.setIcon(null);
}                                         

我已经包括了我的代码要点，希望足以查看！

Answer 1

对于少量数据，请考虑java.util.prefs.preferences。

你能给我提供一些如何使用它的例子吗？

Preferences API概述和这里引用的示例（API和代码）中分析了几个示例。或者，考虑javax.jnlp.persistenceService，这里引用“对于在受限执行环境中运行的应用程序”。

package org.name.table;

import java.awt.Dimension;
import java.awt.EventQueue;
import java.util.prefs.Preferences;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

/**
 * @see https://stackoverflow.com/a/34616583/230513
 */
public class TablePreference {

    private void display() {
        JFrame f = new JFrame("TablePreference");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new JScrollPane(new JTable(new PrefModel()) {

            @Override
            public Dimension getPreferredScrollableViewportSize() {
                return new Dimension(128, 32);
            }
        }));
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private static class PrefModel extends DefaultTableModel {

        private static final int DEFAULT = 42;
        private static final String VALUE_NAME = "value";
        private final Preferences p = Preferences.userNodeForPackage(TablePreference.class);

        public PrefModel() {
            addColumn("A");
            addRow(new Object[]{p.getInt(VALUE_NAME, DEFAULT)});
        }

        @Override
        public void setValueAt(Object aValue, int row, int col) {
            super.setValueAt(aValue, row, col);
            p.putInt(VALUE_NAME, (int) aValue);
        }

        @Override
        public Class<?> getColumnClass(int col) {
            return getValueAt(0, col).getClass();
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new TablePreference()::display);
    }
}