Archive for the ‘SCJA’ category

What is the use of the fillArc() method?

September 26th, 2009

The fillArc() method is used to draw a filled arc. It belongs to the Graphics class. The syntax of this method is as follows:

void fillArc(int top, int left, int width, int height, int startAngle, int sweepAngle)

For example: fillArc(50,5,100,100,75,40);

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Posted in SCJA

Tags: CX310-019

What is the setTransactionIsolation() method?

September 25th, 2009

The setTransactionIsolation() method is used to specify the transaction isolation level. An integer is passed as a parameter specifying the level of isolation. JDBC supports 5 levels of isolation.

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Posted in CIW Professional, Master CIW Enterprise Developer, SCJA

Tags: 1D0-441 CX310-019

What are integer literals?

September 18th, 2009

Numeric values having no decimal parts are called integer literals. These values can be expressed in decimal, octal, and hexadecimal forms. By default, integer literals are in decimal form. The decimal form contains a sequence of decimal digits (0 to 9), the octal form contains a sequence of octal digits (0 to 7) prefixed by 0 (zero), whereas the hexadecimal form contains a sequence of hexadecimal digits (0 to 9, a to f) prefixed by 0x or 0X. In the hexadecimal form, the characters (a to f) may be in uppercase or lowercase.

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Posted in SCJA

Tags: CJP-JAVA-6 CX310-019 CX310-035 CX310-055 CX310-056 CX310-065 CX310-066

What is the purpose of declaring a variable as final?

August 15th, 2009

In Java, final is a keyword. The value of a variable declared as final remains unchanged in an application. This means that the variable should be initialized at the time of its declaration.

The syntax for declaring a variable as final is given below:

final <data-type> <variable-name>

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Posted in Master CIW Enterprise Developer, SCBCD, SCDJWS, SCJA, SCJP, SCJP 5/6, SCMAD, SCWCD

Tags: CX310-019 CX310-055 CX310-065

SCJA CX310-019 Short Notes: Exam passing tips

August 14th, 2009

Fundamental Object-Oriented Concepts

In Java, a narrowing conversion is also known as an explicit type conversion or casting.

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Posted in SCJA

Tags: CX310-019

JDBC

August 14th, 2009

The introduction of the Java language is required before introducing the concept of JDBC. Java is an object-oriented programming language. It incorporates all the objected-oriented concepts such as polymorphism, abstraction, encapsulation, etc. Java is a platform independent language because it can run on different operating systems. Java syntactically resembles C and C++, but it is simpler than the two, as it does not contain pointers and multiple inheritance. Both pointers and multiple inheritance seem complex to the application developer.

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Posted in CIW Professional, Master CIW Enterprise Developer, SCJA

Tags: 1D0-441 CX310-019

What are instance variables?

August 8th, 2009

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 the class.

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Posted in SCJA

Tags: CJP-JAVA-6 CX310-019 CX310-035 CX310-036 CX310-055 CX310-056 CX310-065 CX310-066

What is the increment operator?

August 7th, 2009

The increment operator is a unary operator that increases the value of its operand by one. For example, the expression a++ increases the value of a by 1. This statement is equivalent to the expression a = a + 1.

The increment operator can be used in either of the two forms given below:

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Posted in SCJA

Tags: CJP-JAVA-6 CX310-019 CX310-035 CX310-036 CX310-055 CX310-065

What is the decrement operator?

August 7th, 2009

The decrement operator is a unary operator that decreases the value of its operand by one. For example, the expression a– decreases the value of a by 1. This statement is equivalent to the expression a = a – 1.

The decrement operator can be used in either of the two forms given below:

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Posted in SCJA

Tags: CJP-JAVA-6 CX310-019 CX310-035 CX310-055 CX310-065 CX310-066

What is the setTransactionIsolation() method?

July 31st, 2009

The setTransactionIsolation() method is used to specify the transaction isolation level. An integer is passed as a parameter specifying the level of isolation. JDBC supports 5 levels of isolation.

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