连接数据库java

package query
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class QueryFrame extends JFrame implements ActionListener{
JTextField jf = new JTextField(20);
String[] value = {"姓名","部门"};
JComboBox box = new JComboBox(value);
JButton find = new JButton("查询");
JPanel panel_find = new JPanel();
JPanel panel_content = new JPanel();
Statement stmt = null;

public QueryFrame() {
this.setTitle("查询系统");
Container c = this.getContent

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