First, preface
The JDK (Java development Kit) is the foundation of all Java applications, and it can be said that all Java applications are built on this. It is a set of APIs, or it can be said to be some Java Class. The latest version, which is now officially released, is JDK1.3. Considering I'm not familiar with Linux, and most of it is under the MS System, so here I'm using Win2000.
Second, download, install
Download address for Java official site: java.sun.com, the country is also everywhere.
Windows, run the. exe file directly, install to a directory, I use F:JDK13 as an example here.
Third, the configuration
Select My Computer on the desktop (right-click)
Senior
Environment variables
In the system variables---> New
Enter in the variable name: CLASSPATH, enter the value of the variable:
F:jdk13libdt.jar; F:jdk13libtools. JAR; F:jdk13bin; then determine;
OK, the environment variable will be valid after you restart the computer after the configuration is finished.
Iv. Testing
(1) Write a simple Java program with a text editor:
public class HelloWorld {
public static void Main (String args[]) {
System.out.println (' Hello world! ');
}
}
This example is known as "Hello World", and its function is to display "Hello World".
Note: The file name must be "Helloworld.java" and case sensitive. A careful friend will notice the same name as the public class.
(2) Compile: Execute at DOS command prompt: (note case)
Javac Helloworld.java
If normal, the Helloworld.class file is generated.
(3) Run: Execute at DOS command prompt: (note case)
Java HelloWorld
Here is a Java beginner is likely to encounter problems (not afraid of jokes, I also) is input:
Java Helloworld.class
After the. class, be sure to note that the following error will occur:
Exception in thread ' main ' Java.lang.noclassdeffounderror:helloworld/class
(I guess, is not the Java translation ".") "/", or other reasons that I do not know)
Well, running Java HelloWorld should show the great "Hello world".
In this step, you have successfully configured the JDK, you can start a long and painful (for like me, not before the Java friends, can use "pain" to describe, do not understand the concept, unfamiliar Java API ..., but, do not worry, I will be with you slowly to get started, slowly improve ... ...) Java process. (Source: viphot.com)
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