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programming languages Online Quiz - 336

Description: programming languages Online Quiz - 336
Number of Questions: 20
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Tags: programming languages
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Which is simplest and correct code snippet needs to be put in the main function to replace the value object of the HashMap for the key “orange”?
technology programming languages

  1. itemMap.remove("orange"); itemMap.put("orange", new Item("Orange") );

  2. ((Item)itemMap.get(“orange”)).name = “Orange”;

  3. itemMap.put("orange", new Item("Orange") );

  4. None of above

Show answer
Correct Option: B

Which is the most performance efficient implementation for assignCode method from the given options?

technology programming languages

  1. code attribute cannot be changed as Item class doesn’t have setter method for it.

  2. for (int i = 0; i < itemList.size(); i++) { if(itemList.get(i) != null) { ((Item)itemList.get(i)).code = 50+i; } }

  3. int i = 0; Item im = null; while (i < itemList.size()) { im = (Item)itemList.get(i); if(im != null) { im.code = 50+i; } i++; }

  4. int i = 0; Item im = null; Iterator itr = itemList.iterator(); while (itr.hasNext()) { im =(Item) itr.next(); im.code = 50+i; i++; }

Show answer
Correct Option: D

Which of the given options code is correct and will not waste memory.
technology programming languages

  1. Item im = new Item(null); im = (Item ) itemList.get(0);

  2. Item im = new Item(“Done”); im = (Item ) itemList.get(0);

  3. Item im = null; im = (Item ) itemList.get(0);

  4. All of the above.

Show answer
Correct Option: C

Which code in the given options if put in below Main class will not print “Done”?

technology programming languages

  1. Function call:- changeName(im); Function implementation :- { im.name = "Done"; return null; }

  2. Function call:- changeName(im); Function implementation :- { im = new Item("Done"); return null; }

  3. Function call :- im = changeName(im); function implementation :- { Item otherObject = new Item("Done"); return otherObject; }

  4. All of the above

Show answer
Correct Option: B

Which code from the given options if put in Main class will not print “Done”?

technology programming languages

  1. Function call:- changeName(im); Function implementation :- { im.name = "Done"; return null; }

  2. Function call:- changeName(im); Function implementation :- { im = new Item("Done"); return null; }

  3. Function call :- im = changeName(im); function implementation :- { Item otherObject = new Item("Done"); return otherObject; }

  4. All of the above

Show answer
Correct Option: B

Which is simplest code snippet you will add in the main function to set the name attribute of 50th in the ItemList to “Done”?
technology programming languages

  1. im.name = "Done";

  2. Item otherObject = new Item(“Done”); itemList.set(49, otherObject);

  3. ((Item)itemList.get(49)).name = “Done”;

  4. None of above is correct as they are not changing 50th element.

Show answer
Correct Option: A

Which of the given options code is correct and will not waste memory. Note :- Defination of the Class Item is class Item { public int code; public String name; public Item(String name) { this.name = name; } } itemList is ArrayList containing 50 objects of Class Items.
technology programming languages

  1. Item im = new Item(null); im = (Item ) itemList.get(0);

  2. Item im = new Item(“Done”); im = (Item ) itemList.get(0);

  3. Item im = null; im = (Item ) itemList.get(0);

  4. All of the above.

Show answer
Correct Option: C

Which is simplest and correct code snippet needs to be put in the main function to replace the value object of the HashMap for the key “orange”?
technology programming languages

  1. itemMap.remove("orange"); itemMap.put("orange", new Item("Orange") );

  2. ((Item)itemMap.get(“orange”)).name = “Orange”;

  3. itemMap.put("orange", new Item("Orange") );

  4. None of above

Show answer
Correct Option: B

Which is the most performance efficient implementation for assignCode method from the given options?
technology programming languages

  1. code attribute cannot be changed as Item class doesn’t have setter method for it.

  2. for (int i = 0; i < itemList.size(); i++) { if(itemList.get(i) != null) { ((Item)itemList.get(i)).code = 50+i; } }

  3. int i = 0; Item im = null; while (i < itemList.size()) { im = (Item)itemList.get(i); if(im != null) { im.code = 50+i; } i++; }

  4. int i = 0; Item im = null; Iterator itr = itemList.iterator(); while (itr.hasNext()) { im =(Item) itr.next(); im.code = 50+i; i++; }

Show answer
Correct Option: D

Which is simplest and correct code snippet needs to be put in the main function to replace the value object of the HashMap for the key “orange”?
technology programming languages

  1. itemMap.remove("orange"); itemMap.put("orange", new Item("Orange") );

  2. ((Item)itemMap.get(“orange”)).name = “Orange”;

  3. itemMap.put("orange", new Item("Orange") );

  4. None of above

Show answer
Correct Option: B

Which is the most performance efficient implementation for assignCode method from the given options?

technology programming languages

  1. code attribute cannot be changed as Item class doesn’t have setter method for it.

  2. for (int i = 0; i < itemList.size(); i++) { if(itemList.get(i) != null) { ((Item)itemList.get(i)).code = 50+i; } }

  3. int i = 0; Item im = null; while (i < itemList.size()) { im = (Item)itemList.get(i); if(im != null) { im.code = 50+i; } i++; }

  4. int i = 0; Item im = null; Iterator itr = itemList.iterator(); while (itr.hasNext()) { im =(Item) itr.next(); im.code = 50+i; i++; }

Show answer
Correct Option: D

Which code from the given options if put in Main class will not print “Done”?

technology programming languages

  1. Function call:- changeName(im); Function implementation :- { im.name = "Done"; return null; }

  2. Function call:- changeName(im); Function implementation :- { im = new Item("Done"); return null; }

  3. Function call :- im = changeName(im); function implementation :- { Item otherObject = new Item("Done"); return otherObject; }

  4. All of the above

Show answer
Correct Option: B

Which is simplest code snippet you will add in the main function to set the name attribute of 50th in the ItemList to “Done”?
technology programming languages

  1. im.name = "Done";

  2. Item otherObject = new Item(“Done”); itemList.set(49, otherObject);

  3. ((Item)itemList.get(49)).name = “Done”;

  4. None of above is correct as they are not changing 50th element.

Show answer
Correct Option: A

Which of the given options code is correct and will not waste memory. Note :- Defination of the Class Item is class Item { public int code; public String name; public Item(String name) { this.name = name; } } itemList is ArrayList containing 50 objects of Class Items.

technology programming languages

  1. Item im = new Item(null); im = (Item ) itemList.get(0);

  2. Item im = new Item(“Done”); im = (Item ) itemList.get(0);

  3. Item im = null; im = (Item ) itemList.get(0);

  4. All of the above.

Show answer
Correct Option: C

Examine this package body: CREATE OR REPLACE PACKAGE BODY forward_pack IS V_sum NUMBER; - 44 - PROCEDURE calc_ord(. . . ); PROCEDURE generate_summary(. . . ) IS BEGIN Calc_ord(. . . ); . . . END calc_ord; END forward_pack; / Which construct has a forward declaration?
technology programming languages

  1. a) V_SUM

  2. b) CALC_ORD.

  3. c) FORWARD_PACK

  4. d) GENERATE_SUMMARY.

Show answer
Correct Option: B

Which of the following is not a java keyword?

technology programming languages

  1. assert

  2. interface

  3. extend

  4. transient

Show answer
Correct Option: C

which is the value of x and y after running this code? class a { public static void main(String args[]) { int x=1; int y=x++; } }
technology programming languages

  1. x=1 and y=1

  2. x=1 and y=2

  3. x=2 and y=2

  4. x=2 and y=1

Show answer
Correct Option: D

what is the value of x and y after running this code? class a { public static void main(String args[]) { int x=1; int y=x++; } }
technology programming languages

  1. x=1 and y=1

  2. x=2 and y=2

  3. x=1 and y=2

  4. x=2 and y=1

Show answer
Correct Option: D

What is the output:class a { public static void main (String args[]) { int x; int y=10; if (y>0) { x = 10; } System.out.println(x); } }

technology programming languages

  1. 10

  2. 0

  3. Garbage Value

  4. Compile time error

Show answer
Correct Option: D

How many times pre query and post query fired when we fetch 10 record from a table ?
technology programming languages

  1. 1,1

  2. 1,10

  3. 10,10

  4. 10,1

Show answer
Correct Option: B
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