JAVA

1. Java-overview 2. Features of Java 3. History of Java 4. HW SW Req for Java SE 7 5. Java Environment Setup 6. Basic Requirement 7. Comments 8. My First Program in Java 9. Line Break 10. Escape Sequences 11. Literals in Java 12. Identifiers in Java 13. Variables in Java 14. Data-Types in Java 15. Declare Variables 16. Reserved Key Words 17. printf() 18. Chained & Embedded state 19. Prog.to print sum of 2 nos 20. Scanner class 21. Prg.to print sum & average 22. Area & Perimeter of Rectangle 23. Area Circumference of Circle 24. Prg.for Simple Calculator 25. Operatos in Java 26. Ex. Of Operators 27. Swap two numbers 28. Hierarchy of Operators 29. if( ) statement 30. Prg.to check +ve,-ve or zero 31. if..else statement 32. Prg.to check Odd or Even 33. Prg.to print larger of 2 nos 34. Prg.to print largest of 3 nos 35. Prg.to check divisibility 36. Prg.to check print range 37. for. . . loop statement 38. prg.to print series of nos 39. Prg.to check divisibility 40. prg.to print sum of nos 41. Prg.to print Pyramid 42. prg.for Factorial 43. prg.to fill screen 44. prg.for largest/smallest no 45. prg.to print reverse no 46. prg.to add each digit 47. prg.for sum of series 48. prg.for fibonacci series 49. prg.to check Prime nos 50. prg. Prime no from 1 to 100 51. prg.Specified Prime nos 52. while( ) statement 53. do. . While statement 54. break & continue statement 55. switch case statement 56. Array in Java 57. print reverse order using array 58. Ascending/Descending order 59. prg.to search no in Array 60. Multidimensional Array 61. String in Java 62. String with spaces 63. prg.to print string in reverse 64. prg. to count A,E,I,O,U vowel 65. User defined methods 66. Methods program example 67. General Purpose Programs 68. Loan & EMI calculation prg. 69. Table print prg. 70. Leap year program 71. lower to UPPER case prg. 72. Age Distribution prg. 73. Bank note calculation prg. 74. Simple Interest prg. 75. Compound Interest prg. 76. Simple Depreciation prg. 77. Reducing bal.Depreciation prg. 78. Marksheet prg. 79. Income Tax prg. 80. Time calculator prg. 81. Distance converter prg. 82. Volume Air Calculation prg. 83. Time to fill Water Tank prg. 84. Salary Calculation prg. 85. Total Sale Calculation prg. 86. Male/Female percentage prg. 87. Library Rent prg. 88. Office Expance prg. 89. Total Salary Calculation prg. 90. Profit or Loss prg. 91. Total Profit/Loss prg. 92. Palindrome program 93. Java Interview Part1 94. Java Interview Part2 95. Java Interview Part3 96. Java Interview Part4 97. Java Interview Part5 98. Java Interview Part6 99. Java Interview Part7 100. Java Interview Part8 101. Java Interview Part9 102. Java Interview Part10 103. Java Interview Part11
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Array in Java tutorials

  • An array is a collection of variables of the same type that are referred to by a common name.

  • In Java, arrays can have single or more dimensions, although the single-dimensional array is the most common. Arrays are used for a variety of purposes because they offer a convenient means of grouping together related variables.

  • For example, you might use an array to hold a record of the daily high temperature for a month, a list of stock prices, or your collection of programming books.

  • The principal advantage of an array is that it organizes data in such a way that it can be easily manipulated.

  • For example, if you have an array containing the dividends for a selected group of stocks, it is easy to compute the average income by cycling through the array.

  • Also, arrays organize data in such a way that it can be easily sorted.

  • Although arrays in Java can be used just like arrays in many other programming languages, they have one special attribute they are implemented as objects.

  • This fact is one reason that a discussion of arrays was deferred until objects had been introduced.

  • By implementing arrays as objects, several important advantages are gained, not the least of which is that unused arrays can be garbage-collected.


    Declaring Single Dimensional Array

  • A Single-dimensional array is a list of related variables. Such lists are common in programming.

  • For example, you might use a one-dimensional array to store the account numbers of the active users on a network, array can also store the current batting averages for a cricket team.

Syntax:

type[] array-name = new type[size]

  • Here in the above syntax, type declares the element type of the array.

  • The element type determines the data type of each element that comprises the array.

  • Notice: The square brackets that follow type. They indicate that a one-dimensional array is being declared. The number of elements that the array will hold is determined by size.

Example of array declaration:

int[ ] no =new int[10];

OR

int[ ] no;

no = new int[10];

 

First

Element

 

 

 

 

 

 

 

 

Last

Element

 

no[0]

no[1]

no[2]

no[3]

no[4]

no[5]

no[6]

no[7]

no[8]

no[9]

Where:

no[0] refers to the first element in the array.

no[1] refers to the second element in the array.

no[9] refers to the last element in the array.

 

Array initialization

  • All elements in an array variable cannot be initialized automatically.

  • Each element of an array has to be initialized separately, either in the declaration statement or using loop.

int[] no = new int[] {20,30,25,23,21};

OR

int no[] =new int[5];

no[0]=20;

no[1]=30;

no[2]=25;

no[3]=23;

no[4]=21;


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