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| 5. 27. 12. 最后变量 |
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/*
* file: FinalVariables.java
* package: oreilly.hcj.finalstory
*
* This software is granted under the terms of the Common Public License,
* CPL, which may be found at the following URL:
* http://www-124.ibm.com/developerworks/oss/CPLv1.0.htm
*
* Copyright(c) 2003-2005 by the authors indicated in the @author tags.
* All Rights are Reserved by the various authors.
*
########## DO NOT EDIT ABOVE THIS LINE ########## */
import javax.swing.JDialog;
/**
* Demonstration of final variables.
*
* @author <a href=mailto:kraythe@arcor.de>Robert Simmons jr. (kraythe)</a>
* @version $Revision: 1.3 $
*/
public class FinalVariables {
/**
* Test code.
*
* @param args Command line arguments.
*/
public static final void main(final String[] args) {
System.out.println("Note how the key variable is changed.");
someMethod("JAVA_HOME");
someMethod("ANT_HOME");
}
/**
* Get an environment property.
*
* @param environmentKey The key to an environment property.
*
* @return The value of the property.
*/
public static String someBuggedMethod(final String environmentKey) {
final String key = "env." + environmentKey;
System.out.println("Key is: " + key);
// key = new String("someValue"); // <= compiler error.
return (System.getProperty(key));
}
/**
* Get an environment property.
*
* @param environmentKey The key to an environment property.
*
* @return The value of the property.
*/
public static String someMethod(final String environmentKey) {
final String key = "env." + environmentKey;
System.out.println("Key is: " + key);
return (System.getProperty(key));
}
/**
* build the panel that comprises the dialog.
*
* @param name The name of the instance.
*/
public void buildGUIDialog(final String name) {
final String instanceName;
if (name == null) {
// no problem here.
instanceName = getClass()
.getName() + hashCode();
} else {
// no problem here as well.
instanceName = getClass()
.getName() + name;
}
JDialog dialog = new JDialog();
// .. Do a bunch of layout and component building.
dialog.setTitle(instanceName);
// .. Do dialog assembly
// instanceName = "hello"; // <= compiler error
}
}
/* ########## End of File ########## */
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