To indent a block of code using JBuilder, just do this:
Alvin Alexander | Java, Scala, Unix, Perl, Mac OS X
To compile a Java program with JBuilder, you must create a Project first. Select File | New Project..., then follow the instructions.
Java String to float FAQ: How do I convert a Java String to a Java float?
Answer: Here's an example that demonstrates how to convert a Java String to a float value. This example code segment converts the String "100.00" to a Java float:
Java compile FAQ: How do I compile my first Java program?
To compile a Java program you first need to download a Java development kit (see java.sun.com) if you don't already have one. Next, assuming you have a program named
MyProgram.java that you want to compile, you compile it like this with the
Assuming that there are no errors, this will create a file named
MyProgram.class. This file contains the Java bytecode representing the instructions of your program.
Java String FAQ: How do I merge/combine two Java String fields?
You can merge/concatenate/combine two Java String fields using the
+ operator, as shown in this example code:
MySQL FAQ - how do I list all the databases in a MySQL database?
Simple. From the mysql command line, use this command:
MySQL table/schema FAQ: How do I show a database table schema in a MySQL database?
Short answer: To show the schema for a MySQL database table, use the MySQL
desc command. You issue this command from the MySQL client command line prompt, like this:
MySQL FAQ: How do I show/list the tables in a MySQL database (using the
mysql command line client)?
To list/show the tables in a MySQL database:
MySQL “users” FAQ: How do I add a new user to a MySQL database (i.e., how do I create a MySQL user account, and then grant database permissions to that new user account)?
Solution: MySQL add user and grant syntax
Here’s an example of what I did recently to (a) create a new MySQL database and then (b) add a new MySQL user account to work with that database.
Step 1: Log in to the database
First, from my Unix prompt, I logged into my MySQL database server with the mysql command line client:
MySQL backup FAQ - How do I backup/dump a MySQL database schema?
Answer: Use the mysqldump database utility.
MySQL dump examples using the mysqldump utility
On a DOS/Windows pc with no name/password protection, you can dump a database named
my_db with the following command, but don't do this just yet:
Note that this gets you not only the database schema, but also the current data in the table.
CVS Login FAQ: Can you show me an example CVS login command?
Sure. Here's CVS login command example:
cvs -d :pserver:email@example.com:/usr/local/cvs login
This cvs login example assumes the following:
Assuming you are using Postgres (Postgresql), and:
- you have *just* done an INSERT into a table named
- the name of the sequence for that table is
- you are using the Java programming language
- you are still using the same database connection that you used with your
to get the value of the Postgres serial value just created after your
INSERT statement, use some code like this:
Java JDBC / database FAQ: Where can I get a JDBC driver for Postgres/Postgresql?
Templates are code snippets that can be easily included in your Java code. The basic idea is that you type in a shortcut code, hit [Ctrl][J], and JBuilder fills in the remainder of the code. You type in a few characters, and JBuilder does the hard work for you.
CVS command FAQ: How do I know if all the changes in my CVS sandbox have been committed?
One way to do this is to move to the directory just above the module you have checked out, then run the command
cvs release command. Let's look at an example:
Java FAQ: How do I multiple two integers (int) in Java?
Here's a quick example:
int i = 3; int j = 4; int k = i * j; System.out.println("k = " + k);
The value of
k here will be
Java integer FAQ: How do I add two Java integers (Java
Answer: Just use the Java addition operator, the plus sign (
+), to add two integers together.
Here's a quick example: If you have to drive 23 miles east, then 14 miles north, what is the total distance you had to drive?