Skills required for Sun test CX310-036

Sun has specified nineteen objectives for Sun test CX310-036 (Sun Certified Programmer for Java 2 Platform Upgrade Exam). These objectives are grouped under eight topics. Before taking the test, an individual should possess a good command over the following areas: Declaring classes, nested......
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Things to practice for Sun test CX310-036.

The CX310-036 (Sun Certified Programmer for Java 2 Platform Upgrade Exam) checks your real ability as a programmer. This test requires you to have a good understanding of the Java language and the capability to write code for well-defined design applications. For this purpose, along with studying......
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String Handling

The String class is defined in the java.lang package and hence is implicitly available to all the programs in Java. The String class is declared as final, which means that it cannot be subclassed. It extends the Object class and implements the Serializable, Comparable, and CharSequence......
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What are final variables?

Variables declared with the keyword final as a modifier are called final variables. They are so called because once initialized a value, their values cannot be modified. Any attempt made to modify the value of a pre-initialized final variable will result in a compile time error. A final......
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What are instance variables?

Variables associated with the instance of a class are called instance variables. Whenever a class is instantiated, the runtime system creates a separate copy of each instance variable defined by the class. Therefore, each instance of a class has its own copy of all instance variables defined by......
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What are local variables?

Variables declared within blocks (i.e., inside braces) are known as local variables. They are so called because they are not available for use outside the block where they are declared. These variables are temporary variables, which are visible to the program only within the scope of the block.......
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What are static variables?

Variables that have only one copy per class are known as static variables. They are not attached to a particular instance of a class but rather belong to a class as a whole. They are declared by using the static keyword as a modifier. For example: static type varIdentifier; where, the......
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What is a block?

When a sequence of statements are put inside the curly braces, they form a block. A block is a Java language feature that allows a programmer to execute multiple lines of code at a time. A block is executed by executing all the statements within the braces in the order from first to last. If......
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What is a catch statement?

A catch statement catches any exception that may arise during program execution and throws the specific exception. Code that is expected to raise an exception is written under a try statement. Multiple catch statements can be specified after a try block so that each catch block of statement can......
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What is a constructor?

A constructor is a special type of method. It initializes an object immediately upon creation. It has the same name as the class in which it resides. A constructor is automatically called immediately after an object is created, before the new operator completes. A constructor can be marked as......
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