JAVAmydb.propertiesmaria.DB_URL = jdbc:mariadb://localhost:3306/mydbmaria.DB_ID = itmaria.DB_PW = 0000oracle.DB_URL = jdbc:oracle:thin:@localhost:1521:XE#oracle.DB_URL = jdbc:oracle:thin:@192.168.0.40:1521:XEoracle.DB_ID = itoracle.DB_PW = 0000 DBManagerpackage com.myjdbc;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;public interface DBManager { public Co..

JAVA IO package com.lec;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.Arrays;public class chap14_IO { public static void main(String[] args) { chap14_IO io..

package com.lec;import java.io.File;import java.text.DecimalFormat;import java.util.stream.IntStream;public class chap13_File2 { public void getDirect(String fileDir) { File f = new File(fileDir); File[] files = f.listFiles(); for (int i = 0; i files[i]) .forEach(file -> { if (file.isDirectory()) { getDirect(file.getAbsolutePath()); } else {// System.out.println(file.getName()); ..

JAVApackage com.lec;import java.util.ArrayList;import java.util.List;import java.util.stream.Collectors;import java.util.stream.IntStream;public class chap11_collections2 { public static void main(String[] args) { EmpVo evo = new EmpVo(); evo.setEmpno(7733); evo.setEname("SMITH"); evo.setSal(1000); evo.toString(); // EmpVo(int empno, String ename, int sal) EmpVo evo2 = new EmpVo(888..