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Easy Learn Java: Programming Articles, Examples and Tips - Page 89


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What is the difference between applets loaded over the net and applets loaded vi

Go to all tips in Java Applets

Question: What is the difference between applets loaded over the net and applets loaded via the file system?

Answer: There are two different ways that applets are loaded by a Java system. The way an applet enters the system affects what it is allowed to do.

If an applet is loaded over the net, then it is loaded by the applet class loader, and is subject to the restrictions enforced by the applet security manager.

If an applet resides on the client's local disk, and in a directory that is on the client's CLASSPATH, then it is loaded by the file system loader. The most important differences are

  • applets loaded via the file system are allowed to read and write files
  • applets loaded via the file system are allowed to load libraries on the client
  • applets loaded via the file system are allowed to exec processes
  • applets loaded via the file system are allowed to exit the virtual machine
  • applets loaded via the file system are not passed through the byte code verifier
  • Java-enabled browsers use the applet class loader to load applets specified with file: URLs. So, the restrictions and protections that accrue from the class loader and its associated security manager are now in effect for applets loaded via file: URLs.

This means that if you specify the URL like so:

Location: file:/home/me/public_html/something.html
and the file something.html contains an applet, the browser loads it using its applet class loader.

From Java Applet Security FAQ



7 comments | Printer Friendly Page  Send to a Friend | Score: 4
Posted by jalex on Monday, October 06, 2003 (00:00:00) (4136 reads)

I want to to have a listener for a String's change event. Is it possible?

Go to all tips in Text processing

Question: I want to to have a listener for a String's change event. Is it possible?

Answer: String has no such listener because you can not change a String.
Strictly saying a String can not be changed. Each time when you change a value of an "old" String Java creates a new String and then refers to "old" one.
However you can write a wrapper class which has two methods - setString() and getString(). The body of those two methods could have additional code that notifies about String's "change" event. Something like this:

public void setString (String aString) {
this.aString = aString;

stringValueChanged();
}

The method stringValueChanged() is responsible for notification
*******************************************
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47 comments | Printer Friendly Page  Send to a Friend | Score: 4
Posted by jalex on Friday, October 03, 2003 (00:00:00) (4310 reads)

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