In Windows:
mkdir XYZ
javac -d XYZ -classpath
c:\j2sdk1.4.2\lib\tools.jar RunItReload.java
In Unix:
mkdir XYZ
javac -d XYZ -classpath
/homedir/JDK14/j2sdk1.4.2/lib/tools.jar
RunItReload.java
Replace homedir with your actual home directory.
If you get an error that the system cannot find the path specified, be sure to create the XYZ directory before compilation.
As before, you need to include the tools.jar file in your runtime classpath, and you need to include the XYZ directory for the actual RunItReload program. To run the program, issue the following command. (Again, although the command is shown on multiple lines, it needs to go on one line).
In Windows:
java -classpath
c:\j2sdk1.4.2\lib\tools.jar;XYZ RunItReload
In Unix:
java -classpath
/homedir/jdk14/j2sdk1.4.2/lib/tools.jar:
XYZ RunItReload
The XYZ here is carried over from the prior javac step. The target directory for compilation (specified after -d) must match the runtime classpath.
Running the program displays the GUI. Then you can:
Enter the name of the class, such as Sample2, to be compiled in the JTextField.
Enter the source code in the JTextArea. Here's the source code for Sample2:
public class Sample2 {
public static void main(String args[]) {
System.out.println(new java.util.Date());
// System.out.println("Hello, World!");
}
}
Click the Go button.
Output is sent to the console. For example, Sample2 should produce output that looks something like this:
Tue Aug 19 11:25:16 PDT 2003
Comment out the line that prints the date, and uncomment the line that prints "Hello World". Click the Go button. You should now see the following in your console:
Hello, World!
You see a different line displayed because a new class loader was created, one that unloaded previously loaded classes.
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