Core Java Training in Training

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CORE Java Training in Chennai
By Accordittraining.com
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Array of java

• Topics
• 1. What is Array?
• 2. Array variables
• 3. Pass by reference
• 4. Multidimensional Arrays

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What is an array?

• An array is a very common type of data structure
  wherein all elements must be of the same data
  type.
• Once defined, the size of an array is fixed and
  cannot increase to accommodate more elements.
• The first element of an array starts with index
  zero.
• Ex
• x00 x11 x22 x33 x44
  x55

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ARRAY VARIABLES

• Using an array in your program is a 3 step
  process -
• 1) Declaring your Array
• 2) Constructing your Array
• 3) Initialize your Array
• 1) Declaring your Array
• Syntax
• ltelementTypegt ltarrayNamegt

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Contd.

• 2) Constructing an Array
• Syntax
• arrayname new dataType
• 3) Initialize an Array
• Syntax
• intArray01 // Assigns an integer value 1 to
  the first element 0 of the array
• intArray12 // Assigns an integer value 2 to
  the second element 1 of the array

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PASS BY REFERENCE

• Arrays are passed to functions by reference, or
  as a pointer to the original. This means anything
  you do to the Array inside the function affects
  the original.

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MULTI DIMENSIONAL ARRAY

• Multidimensional arrays are actually arrays of
  arrays.
• To declare a multidimensional array variable,
  specify each additional index using another set
  of square brackets.
• Ex int twoD new int45
• When you allocate memory for a multidimensional
  array, you need only specify the memory for the
  first (leftmost) dimension.
• You can allocate the remaining dimensions
  separately.

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