1
2011
Oracle java download
Oracle sun 1.7 download
| Linux x86 | 77.27 MB |  jdk-7u1-linux-i586.rpm |
| Linux x86 | 92.17 MB | jdk-7u1-linux-i586.tar.gz |
| Linux x64 | 77.91 MB | jdk-7u1-linux-x64.rpm |
| Linux x64 | 90.57 MB | jdk-7u1-linux-x64.tar.gz |
| Solaris x86 | 154.78 MB | jdk-7u1-solaris-i586.tar.Z |
| Solaris x86 | 94.75 MB | > jdk-7u1-solaris-i586.tar.gz
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| Solaris SPARC | 157.81 MB | jdk-7u1-solaris-sparc.tar.Z |
| Solaris SPARC | 99.48 MB | jdk-7u1-solaris-sparc.tar.gz |
| Solaris SPARC 64-bit | 16.27 MB | jdk-7u1-solaris-sparcv9.tar.Z |
| Solaris SPARC 64-bit | 12.37 MB | jdk-7u1-solaris-sparcv9.tar.gz |
| Solaris x64 | 14.68 MB | jdk-7u1-solaris-x64.tar.Z |
| Solaris x64 | 9.38 MB | jdk-7u1-solaris-x64.tar.gz |
| Windows x86 | 79.46 MB | jdk-7u1-windows-i586.exe |
| Windows x64 | 80.24 MB | jdk-7u1-windows-x64.exe |
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30
2011
Struts 2 setup and beginning
Setting up first demo application
In this tutorial we will learn how to set up struts application and start the app in server.
The tutorials in these website are intend to deploy using Tomcat webserver. Download the Tomcat webserver from http://tomcat.apache.org. Once its downloaded extract or install the tomcat server in desired directory of yours.
Download latest version of Struts from http://struts.apache.org and extract the files from the downloaded file. The downloaded file will contain set of .war files which we will copy to web-apps folder of tomcat for building up our struts application. (more…)
23
2011
Struts 1.x Vs Struts 2.x
What is difference between struts 1.x and struts 2.x
In this article we will learn what is the difference between struts 1.x and struts 2.x
22
2011
10 best struts tutorials
1. Struts 2.2.1 Tutorial - from roseindia.net
2. Struts 1.x Tutorial - from vaannila.com
3. Struts 2.x tutorial - from vaannila.com
4. Struts tutorial from - from allapplabs.com
24
2011
Java inner classes best practice
In java it’s not necessary that we can write separate file for each class. We can write class definition within another class. The inside class is called inner class and enclosing class is called outer class.
Where should we use inner class?
Best practice of inner class is, it’s should not be create without any specific reason. Because using inner class is cost to high maintainability and readable. When you create an inner class and accessing private data of the outer class, at the compilation time JDK create separate package-access member functions in the outer class for inner class to access the private members, this lead to a security hole. In general we should avoid using inner classes. Use inner class only when an inner class is only relevant in the context of the outer class and/or inner class can be made private so that only outer class can access it. Inner classes are used primarily to implement helper classes like Iterators, Comparators etc which are used in the context of an outer class.
(more…)
23
2011
How does Java allocate stack and heap memory in jvm
When each time a new object created in Java it goes into the area of memory known as heap. The primitive variables like int, long, float, double…Etc are allocated in the stack (i.e. Stack follow Last In First Out algorithm), if variables are local variables it places in stack and if variables are member variables (i.e. fields of a class) then it place in heap. In Java methods and its local variables are pushed into stack when a method is invoked and stack pointer is decremented when a method call is completed. (more…)
21
2011
Difference between shallow cloning and deep cloning of objects
When we do object’s cloning by default it is a shallow copy. But to achieve a deep copy the classes must be edited or adjusted. Below is the object example where it shows the difference between shallow cloning and deep cloning. (more…)
21
2011
Best practices when implementing a user defined key
Best practices when you implement a user defined key. This is very important when you are using user defined key in collection. Below are the primary considerations when implementing a user defined key
- If a class overrides equals(), it must override hashCode().
- If 2 objects are equal, then their hashCode values must be equal as well.
- If a field is not used in equals(), then it must not be used in hashCode().
- If it is accessed often, hashCode() is a candidate for caching to enhance performance.
- It is a best practice to implement the user defined key class as an immutable
21
2011
Best practices to equals() and hashCode() in java
Whenever you are working collections and you want you add key as your own defined classes then you must understand the best practices of equals() and hashCode() non final methods.
The equals() and hashCode() methods prove to be very important, when user defined class implements these two methods are added to collections. If you implement these methods incorrectly or not implemented at all then your objects stored in a collection like a Set, List or Map may behave strangely and its very difficult to debug. (more…)
17
2011
Best practices relating to Java collection
Best practices while using java collections
Use ArrayList, HashMap etc as opposed to Vector, Hashtable etc, where possible to avoid any synchronization overhead. Even better is to use just arrays where possible. If multiple threads concurrently access a collection and at least one of the threads either adds or deletes an entry into the collection, then the collection must be externally synchronized.
NOTE: use java.util.concurrent package for J2SE 5.0
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