Data Structures: Arrays and Array Processing
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Questions and Answers

What is the correct syntax to declare and create a one-dimensional array of integers?

  • int[] arr = new int;
  • int arr = new int[15];
  • int arr = new int[15];
  • int[] arr; arr = new int[15]; (correct)

    • What can be the type of elements in an array?

  • Neither primitives nor objects
  • Only objects
  • Either primitives or objects (correct)
  • Only primitives

    • What is the term for the variables in an array?

  • Components (correct)
  • Variables
  • Items
  • Elements

    • What happens when you create a new array?

    <p>Only the array is created, not the objects that will be stored in it</p> Signup and view all the answers

    How do you create an array of Strings and store 5 Strings in it?

    <p>String[] str = new String[5];</p> Signup and view all the answers

    What is the term for the number of components an array has?

    <p>Length</p> Signup and view all the answers

    What is the type of data stored in an array?

    <p>Same data type</p> Signup and view all the answers

    What is the syntax to refer to an array element?

    <p>arrayname[subscript]</p> Signup and view all the answers

    What happens when an array is passed as a parameter to a function?

    <p>A reference to the array is passed</p> Signup and view all the answers

    How are arrays instantiated in a program?

    <p>Using the new operator</p> Signup and view all the answers

    What is the index of the last element in an array with 15 elements?

    <p>14</p> Signup and view all the answers

    What is the result of arr[k % j] if k is 7 and j is 5?

    <p>arr[2]</p> Signup and view all the answers

    What is the purpose of the 'length' variable in an array?

    <p>To get the number of elements in an array</p> Signup and view all the answers

    What happens when you initialize an array without assigning initial values?

    <p>It is initialized with default values</p> Signup and view all the answers

    What is the syntax to initialize an array with initial values in Java?

    <p>int[] arr = new int[] {-2,8,-1,-3,16,20,25,16,16,8,18,19,45,21,-2};</p> Signup and view all the answers

    How do you refer to the elements of an array?

    <p>Using the array name followed by the index</p> Signup and view all the answers

    What is the default value of an uninitialized integer array in Java?

    <p>0</p> Signup and view all the answers

    How do you declare an array of objects in Java?

    <p>Person[] persons;</p> Signup and view all the answers

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