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

Date: 2019-08-11 View: 1483

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

Date: 2019-08-11 View: 1374

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

Date: 2019-08-11 View: 1224

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

Date: 2019-08-11 View: 1294

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

Date: 2019-08-11 View: 1252

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

Date: 2019-08-11 View: 1301

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

Date: 2019-08-11 View: 1187

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

Date: 2019-08-11 View: 1450

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: 1171

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

Date: 2019-08-11 View: 2138

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: 2193

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: 1714

Some Java Conferences and Events 2019.

Date: 2019-08-11 View: 1281

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

Date: 2019-08-11 View: 1485

Many examples are using the .count() as the terminal operation for .peek(), for example:

Date: 2019-08-11 View: 1609