how to run java

How to run java?

Step 1: Download and install JDK 6.0. The installation path is: C:\java\jdk1.6.

Step 2: Click on "My Computer" Right-click, select "Properties", select the "Advanced" tab in the "System Properties" window, then click the "Environment Variables" button, an "Environment Variables" window will pop up, create a new variable in the system variables, the variable name is "JAVA_HOME" , the variable value is "C:\java\jdk1.6"; if there is a "PATH" variable name, press edit and enter "C:\java\jdk1.6\bin;" at the front of the variable value. (Note that it is separated by At the end of the number, there are no quotation marks. If there is no "PATH", click to create a new "PATH" variable name, the variable value is the same).

Step 3: Click "Start" -> "Run" of Windows xp , enter cmd in the pop-up run window, press Enter, open a command line window, enter javac, you will see a series of javac common parameter options. Congratulations on the successful installation of the java environment.

Step 4 : Start programming (note that you first double-click to open "My Computer", go to "Tools" -> "Folder Options" -> click the "View" option -> find "Hide known file types" in "Advanced Settings" "Remove the small check mark in front of the extension"). Create a new subdirectory in the root directory of the C drive named "JavaTest" as a place to store Java source code. In the JavaTest folder, create a new text document and change "New Text Document.txt" to "HelloWorld.java". Open "HelloWorld.java" with Notepad, enter:

public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, world!");
System.out.println("恭喜你成功运行了第一个java应用程序!");
}
}

Note that the source file name must be the same as the class name, and the class modifier is public, and the file name suffix is ​​".java". Save the file.

Step 5: Enter cd C:\JavaTest in the command line window and transfer the current path to the JavaTest directory. Then, enter javac HelloWorld.java, and the JDK will compile and generate a HelloWorld.class class file in the JavaTest folder.

Step 6: Enter java HelloWorld in the command line window, (note there is no .class suffix) the screen appears

Hello world!

Congratulations on successfully running your first java application!

indicates success, and the first Java application is successfully compiled and run.

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