December 1999
Intermediate to advanced
816 pages
20h 27m
English
Content preview from PURE Java™ 2Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Using Policy-Based Security
In JDK 1.0 and 1.1, security in terms of use of system resources was governed by the java.lang.SecurityManager class. Fundamental to the SecurityManager class and policy-based permissions as well is the principle that if a right is not expressly granted, your code does not have it. The SecurityManager class consists of several methods, mostly checkxxx, where xxx is the name of some operation that could adversely affect a host's data, such as checkRead() and checkWrite(). When you tried an operation that might be a security violation, Java called the appropriate SecurityManager method to see if it was okay to allow you to perform the operation. For example, this constructor call in an applet running in a Web browser: ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.