A Java example to generate a strong, secure random password containing [a-zA-Z0-9!@#$%&*()_+-=[]?] characters, with a length of 15.

Date: 2019-08-11 View: 1541

FastJson provides easily APIs to convert Java objects to / from JSON

Date: 2019-08-11 View: 1807

In Java, there are many ways to write a String to a File.

Date: 2019-08-11 View: 1682

In Java, we have many ways to convert a File to a String.

Date: 2019-08-11 View: 1487

In Java, -Xms set initial Java heap size, while -Xmx set the maximum Java heap size.

Date: 2019-08-11 View: 1719

Only Streams whose source are an IO channel like Files.lines(Path, Charset) need to be closed.

Date: 2019-08-11 View: 1529

Different operating system has a different new line or line separator string:

Date: 2019-08-11 View: 1600

If Java 8, DateTimeFormatter, else SimpleDateFormat to change the date format in a String.

Date: 2019-08-11 View: 1459

A JDBC example to connect to a PostgreSQL, and print out all the tables from the default database postgres

Date: 2019-08-11 View: 1733

Since Java 1.6, JDBC 4.0 API, it provides a new feature to discover java.sql.Driver automatically, it means the Class.forName is no longer required. Just put any JDBC 4.x driver in the project classpath, and Java is able to detect it.

Date: 2019-08-11 View: 1451

A JDBC CallableStatement example to show you how to call a stored function from PostgreSQL database.

Date: 2019-08-11 View: 2457

How to Uninstall Oracle Database 19c on Windows

To uninstall Oracle database on Windows, we have to delete the all the related Ora* registry keys, files and folders manually.

Date: 2019-08-11 View: 2550

ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

This is caused by the requested SID doesn’t exist in {ORACLE_HOME}/network/admin/tnsnames.ora

Date: 2019-08-11 View: 2074

Some Java Conferences and Events 2019.

Date: 2019-08-11 View: 1565

In Java, we can use Timestamp.valueOf(LocalDateTime) to convert a LocalDateTime into a Timestamp.

Date: 2019-08-11 View: 1813