Tag: technology

Quizzes (307) Questions (36705)

Questions Related to technology

Multiple choice technology

import java.util.Scanner; public class ScannerTest { public static void main(String[] args) { Scanner scanner = new Scanner("hello 1 2.00 false"); scanner.useDelimiter(" "); String str = scanner.next(); int anInt = scanner.nextInt(); float aFloat = scanner.nextFloat(); boolean booleanValue = scanner.nextBoolean(); System.out.println(str + ":" + anInt + ":" + aFloat + ":" + booleanValue); } }

  1. The program will output 'hello:1:2.0:false'

  2. The program will throw Input Mismatch exception at the run-time

  3. The program will output nothing.

  4. The program will ouput ':1:2.0:false'
Reveal answer Fill a bubble to check yourself
A Correct answer
Full explanation
Multiple choice technology

public class Gen<G>{ G g; Gen(G g) { this.g =g; } public static void main(String[] args) { Gen<String> arr[] = new Gen[5]; //line 1 arr[0] = new Gen("Java"); //line 2 arr[1] = new Gen(1); //line 3 arr[2] = (Gen<String>)new Gen(1); //line 4 arr[3] = (Gen<String>)new Gen<Integer>(1); //line 5 for(Gen o:arr) { System.out.println(o); } } }

  1. Compile time Error at line 1

  2. Compile time Error at line 3

  3. Compile time Error at line 4

  4. Compile time Error at line 5

  5. Run Time Error
Reveal answer Fill a bubble to check yourself
D Correct answer
Full explanation
Multiple choice technology

What will be the result of attempting to compile and run the following code? abstract class MineBase { abstract void amethod(); static int i; } public class Mine extends MineBase { public static void main(String argv[]){ int[] ar=new int[5]; for(i=0;i < ar.length;i++) System.out.println(ar[i]); } }

  1. a sequence of 5 0's will be printed

  2. Error: ar is used before it is initialized

  3. Error Mine must be declared abstract

  4. IndexOutOfBoundes Error
Reveal answer Fill a bubble to check yourself
C Correct answer
Full explanation
Multiple choice technology

What will be output if you try to compile and run the following code, but there is no file called Hello.txt in the current directory? import java.io.*; public class Mine { public static void main(String argv[]){ Mine m=new Mine(); System.out.println(m.amethod()); } public int amethod() { try { FileInputStream dis=new FileInputStream("Hello.txt"); }catch (FileNotFoundException fne) { System.out.println("No such file found"); return -1; }catch(IOException ioe) { } finally{ System.out.println("Doing finally"); } return 0; } }

  1. No such file found

  2. No such file found ,-1

  3. No such file found, Doing finally, -1

  4. 0
Reveal answer Fill a bubble to check yourself
C Correct answer
Full explanation