我正在创建一个程序，其中我有两个组合框“ jComboBox1 ”＆amp; “的 jComboBox2 ”。 “jComboBox1”正在从数据库中检索所有库。 而“jComboBox2”应该带来所选银行的所有账户。现在，我设法检索“jComboBox1”中的所有库。但我不明白如何将它与第二个组合框连接 我的代码如下。
package frame;
import java.beans.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import javax.swing.*;
//import org.apache.pdfbox.pdmodel.*;
import java.io.*;
public class print_cheque extends javax.swing.JFrame {
public print_cheque() {
initComponents();
Connection con = null;
//Statement st = null;
String query = "Select bnk_nm from d_bank_mst";
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ora10g", "payablek", "payablek");
System.out.println("connection successful");
java.sql.Statement st = con.createStatement();
ResultSet rs = st.executeQuery(query);
while (rs.next()) {
String bank = rs.getString(1);
jComboBox1.addItem(bank);
}
//con.close();
st.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e);
}
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jComboBox1 = new javax.swing.JComboBox<>();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jComboBox2 = new javax.swing.JComboBox<>();
jLabel3 = new javax.swing.JLabel();
jComboBox3 = new javax.swing.JComboBox<>();
jLabel4 = new javax.swing.JLabel();
jComboBox4 = new javax.swing.JComboBox<>();
jRadioButton1 = new javax.swing.JRadioButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jComboBox1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jComboBox1ActionPerformed(evt);
}
});
jLabel1.setText("Bank Name");
jLabel2.setText("Account No");
jComboBox2.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
jLabel3.setText("From Cheque No");
jComboBox3.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
jLabel4.setText("To Cheque No");
jComboBox4.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
jRadioButton1.setText("Cash");
jRadioButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jRadioButton1ActionPerformed(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()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(33, 33, 33)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel2)
.addComponent(jLabel1)))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel3, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel4, javax.swing.GroupLayout.Alignment.TRAILING))))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jComboBox2, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jComboBox1, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jComboBox3, 0, 253, Short.MAX_VALUE)
.addComponent(jComboBox4, 0, 253, Short.MAX_VALUE))
.addComponent(jRadioButton1))
.addContainerGap(49, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(64, 64, 64)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jComboBox3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jComboBox4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4))
.addGap(18, 18, 18)
.addComponent(jRadioButton1)
.addContainerGap(82, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jRadioButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(print_cheque.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(print_cheque.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(print_cheque.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(print_cheque.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new print_cheque().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JComboBox<String> jComboBox1;
private javax.swing.JComboBox<String> jComboBox2;
private javax.swing.JComboBox<String> jComboBox3;
private javax.swing.JComboBox<String> jComboBox4;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JRadioButton jRadioButton1;
}
答案 0 :(得分：2)
试试这个
package com.example.user.smgapp;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
import java.util.HashMap;
import java.util.List;
public class Prd_grid_adapter extends BaseAdapter {
List<HashMap<String, String>> Category_listData;
HashMap<String, String> map;
Context context;
Typeface face;
String wishList_url, remove_wishList_url;
Cursor cursor;
NavigationDrawer nav = new NavigationDrawer();
private static LayoutInflater inflater = null;
public Prd_grid_adapter(Activity context, List<HashMap<String, String>> aList) {
// TODO Auto-generated constructor stub
Category_listData = aList;
/*/for(int i=1;i<aList.size();i++)
{
Category_listData.add(aList.get(i));
}*/
this.context = context;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return Category_listData.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public class Holder {
TextView name, price, original_price;
ImageView img, wish_list;
}
@Override
public View getView(final int position, final View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final Holder holder = new Holder();
final View rowView;
this.face = Typeface.createFromAsset(context.getAssets(), "fonts/OpenSans-Regular.ttf");
rowView = inflater.inflate(R.layout.grid_item_view, null);
holder.name = (TextView) rowView.findViewById(R.id.p_name);
holder.img = (ImageView) rowView.findViewById(R.id.p_img);
holder.wish_list = (ImageView) rowView.findViewById(R.id.wish_list);
holder.price = (TextView) rowView.findViewById(R.id.p_price);
holder.original_price = (TextView) rowView.findViewById(R.id.orginal_p);
map = Category_listData.get(position);
holder.name.setTypeface(face);
holder.name.setText(map.get("product_name"));
Log.e("wish list staus..", "wishlist status.." + map.get("is_wishlist"));
if (map.get("is_wishlist").equals("0")) {
holder.wish_list.setImageResource(R.drawable.empty_wishlist);
} else {
holder.wish_list.setImageResource(R.drawable.wishlist);
}
holder.wish_list.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (SingletonActivity.custidstr.isEmpty()) {
Toast.makeText(context, "Ur not logged in,Please Login", Toast.LENGTH_SHORT).show();
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Alert!");
builder.setMessage("Ur not logged in")
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent intent = new Intent(context, Login.class);
context.startActivity(intent);
}
});
// Create the AlertDialog object and return it
builder.show();
} else {
wishList_url = SingletonActivity.API_URL + "api/add_wishlist.php?customer_id=" + SingletonActivity.custidstr + "&product_id=" + Category_listData.get(position).get("product_id");
remove_wishList_url = SingletonActivity.API_URL + "api/remove_item_wishlist.php?customerid=" + SingletonActivity.custidstr + "&productid=" + Category_listData.get(position).get("product_id");
Log.e("wishlist api..", "wish list api.." + wishList_url);
Log.e("remove wishlist api..", "remove wish list api.." + remove_wishList_url);
v.setActivated(!v.isActivated());
String wish_status = map.get("is_wishlist");
Log.e("wish status..", "wish status.." + wish_status);
int stat = Integer.parseInt(wish_status);
// notifyDataSetChanged();
/*if (wish_status=="Product already exists in wishlist"){
Toast.makeText(context,"removed....",Toast.LENGTH_SHORT).show();
nav.removeFromwishList(remove_wishList_url);
holder.wish_list.setImageResource(R.drawable.empty_wishlist);
}
else
{
nav.addTowishList(wishList_url);
Toast.makeText(context,"addedd..",Toast.LENGTH_SHORT).show();
holder.wish_list.setImageResource(R.drawable.wishlist);
}*/
if (stat == 0) {
nav.addTowishList(wishList_url);
Toast.makeText(context, "addedd..", Toast.LENGTH_SHORT).show();
holder.wish_list.setImageResource(R.drawable.wishlist);
// notifyDataSetChanged();
/* ((Activity)context).finish();
Intent i= ((Activity) context).getIntent();
context.startActivity(i);*/
//
} else {
nav.removeFromwishList(remove_wishList_url);
holder.wish_list.setImageResource(R.drawable.empty_wishlist);
Toast.makeText(context, "removed....", Toast.LENGTH_SHORT).show();
/* ((Activity)context).finish();
Intent i= ((Activity) context).getIntent();
context.startActivity(i);*/
// notifyDataSetChanged();
}
/* v.setActivated(!v.isActivated());
if (v.isActivated()){
Toast.makeText(context,"addedd..",Toast.LENGTH_SHORT).show();
holder.wish_list.setImageResource(R.drawable.wishlist);
nav.addTowishList(wishList_url);
}
else {
Toast.makeText(context,"removed....",Toast.LENGTH_SHORT).show();
nav.removeFromwishList(remove_wishList_url);
holder.wish_list.setImageResource(R.drawable.empty_wishlist);
}*/
}
}
});
if (map.get("special_price").equals("0.00")) {
holder.price.setVisibility(View.INVISIBLE);
// holder.o_price.setVisibility(View.INVISIBLE);
holder.original_price.setText("Rs." + map.get("product_price"));
holder.original_price.setTextAppearance(context, R.style.product_price_txt);
} else {
holder.price.setText("Rs." + map.get("special_price"));
holder.original_price.setText("Rs." + map.get("product_price"));
holder.original_price.setPaintFlags(holder.original_price.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
}
/* holder.price.setText("Rs." + map.get("special_price"));
holder.original_price.setText("Rs."+map.get("product_price"));
holder.original_price.setPaintFlags(holder.original_price.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);*/
Picasso.with(context).load(map.get("product_image")).placeholder(R.drawable.loading)
.fit().into(holder.img);
return rowView;
}
}
import java.beans.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JComboBox;
import javax.swing.JOptionPane;
/**
*
* @author Sher Sodha
*/
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
Connection con = null;
java.sql.Statement stmt = null;
public NewJFrame() throws ClassNotFoundException, SQLException {
initComponents();
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ora10g", "payablek", "payablek");
System.out.println("connection successful");
String query = "Select bnk_nm from d_bank_mst";
java.sql.Statement st = con.createStatement();
ResultSet rs = st.executeQuery(query);
while (rs.next()) {
String bank = rs.getString(1);
jComboBox1.addItem(bank);
}
rs.close();
}
/**
* 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")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jComboBox1 = new javax.swing.JComboBox<>();
jComboBox2 = new javax.swing.JComboBox<>();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(null);
jComboBox1.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item3", "Item 4" }));
jComboBox1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jComboBox1ActionPerformed(evt);
}
});
getContentPane().add(jComboBox1);
jComboBox1.setBounds(60, 32, 56, 20);
jComboBox2.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
getContentPane().add(jComboBox2);
jComboBox2.setBounds(50, 100, 56, 20);
pack();
}// </editor-fold>
private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {
JOptionPane.showConfirmDialog(null, "ello"); // TODO add your handling code here:
JComboBox cb = (JComboBox) evt.getSource();
String banknm = (String) cb.getSelectedItem();
JOptionPane.showMessageDialog(null, banknm);
try {
stmt = con.createStatement();
} catch (SQLException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
ResultSet rs2 = null;
String Query = "Select colouumNafromme from tablename where bnk_nm=" + banknm + " ";
try {
rs2 = stmt.executeQuery(Query);
} catch (SQLException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
try {
while (rs2.next()) {
try {
jComboBox2.addItem(rs2.getString(1));
} catch (SQLException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
} catch (SQLException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
try {
new NewJFrame().setVisible(true);
} catch (ClassNotFoundException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
} catch (SQLException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
答案 1 :(得分：0)
PSEUDO-CODE 所有这些都发生在ActionListener
中ActionListener需要调用jComboBox1.getSelectedItem() jComboBox2.removeAllItems()清空jComboBox2 jComboBox2.addItem(Account) 答案 2 :(得分：0)
JComboBox中有几个方法，如getSelectedItem(), getSelectedIndex()，可用于从中获取和操作数据，也可以使用ActionListener注册JComboBox。
例如
jComboBox1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent event) {
JComboBox<String> jComboBox2 = (JComboBox<String>) event.getSource();
String str = (String) jComboBox2.getSelectedItem();
if (str.equals("A")) {
System.out.println("AAA");
} else if (str.equals("B")) {
System.out.println("BBB!");
}
}
});