Few Java examples to show you how to generate a random alphanumeric String, with a fixed length.

Date: 2019-08-11 View: 1389

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: 1278

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

Date: 2019-08-11 View: 1511

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

Date: 2019-08-11 View: 1395

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

Date: 2019-08-11 View: 1246

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

Date: 2019-08-11 View: 1321

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

Date: 2019-08-11 View: 1269

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

Date: 2019-08-11 View: 1323

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

Date: 2019-08-11 View: 1211

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

Date: 2019-08-11 View: 1469

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: 1197

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

Date: 2019-08-11 View: 2163

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: 2220

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: 1746

Some Java Conferences and Events 2019.

Date: 2019-08-11 View: 1302