查询数据库所有表并统计数量

package com.dbexp.text;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.DatabaseMetaData;


public class DateExp {
        Connection conn = null;
	public Connection getcConnection(){
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/vocs", "root", "123456");
			return conn;
		} catch (ClassNotFoundException e) {
			System.out.println("com.mysql.jdbc.Driver不存在！");
		} catch (SQLException e) {
			System.out.println("数据库链接失败！");
		}
		return null;
		
	}
	
	public void close(){
		try {
			conn.close();
		} catch (SQLException e) {
			System.out.println("数据库链接关闭失败！");
		}
	}
	
	public List<Object> getAllTable(){
		getcConnection();
		//list集合中将会包含查询数据库的所有表名
		List<Object> list = new ArrayList<Object>();
		try {
			DatabaseMetaData dm = (DatabaseMetaData) conn.getMetaData();
			ResultSet rs = dm.getTables("", "", null, null);
			while(rs.next()){
				list.add(rs.getString("TABLE_NAME"));
			}
			close();
			return list;
		} catch (SQLException e) {
			System.out.println("获取数据表失败！");
			return null;
		}
	}

	public static void main(String[] args) {
		DateExp de =  new DateExp();
		List<Object> list = de.getAllTable();
		int count = 0;
		for (int i = 0; i < list.size(); i++) {
			System.out.println(list.get(i));
			if(i == list.size()-1){
				count = i + 1;
			}
		}
		System.out.println("共 "+count+"张表");
	}
}