Fundamental Operators And Wrapper Classes
- 1.IsNaN is made available in
- A.
long
- B.
short
- C.
double
- D.
byte
- 2.The three most important methods available in the wrapper classes are:
- A.
XxxValue()
- B.
Valueof()
- C.
ParseXxx()
- D.
Xxxvalue()
- E.
ValueOf()
- F.
ParseXxx()
- 3.Read the following program class test { public static void main(String [] args) { int x = 3; int y = 1; if (x = y) System.out.println("Equal"); else System.out.println("Not Equal"); } } What is the result?
- A.
The output is Equal
- B.
The output is Not Equal
- C.
An error at " if (x = y)" causes compilation to fall.
- D.
The program executes but no output is show on console.
- 4.What is the output? class Test { public static void main(String [] args) { int x=20; String sup = (x < 15) ? "small" : (x < 22)? "tiny" : "huge"; System.out.println(sup); } }
- A.
Small
- B.
Tiny
- C.
Huge
- D.
Compilation fails
- 5.Primitive data types
- A.
Are also called as objects
- B.
Are not objects
- C.
Cannot access methods of object class
- D.
Can access methods of object class
- 6.Which of the following are legal identifiers
- A.
2variable
- B.
Variable2
- C.
_whatavariable
- D.
_3_
- E.
$anothervar
- F.
#myvar
- 7.Class train { public static void main(String[] args) { Integer x = 0; int y= 0; for(int z = 0; z < 5; z++) if ((++x > 2) || (++y>1)) x++; System.out.println(x + " " + y); } } What is the output of the following program?
- A.
8 0
- B.
8 1
- C.
9 2
- D.
9 1
- 8.The default keyword can be located anywhere in the
- A.
Switch block
- B.
Switch expression
- C.
Switch statement
- D.
Switch construct
- 9.Wrapper classes are -----------
- A.
Extensible
- B.
Immutable
- C.
Serializable
- D.
All the above
- 10.The easiest way to turn a number into a string is to simply concatenate using
- A.
+
- B.
-
- C.
&
- D.
*
- 11.What is the output of System.out.println(-3>>>1)?
- A.
2147483646
- B.
1
- C.
2
- D.
Cannot be shifted
- 12.double c=Double.parseDouble("50h"); System.out.println(c); What is the output of the above program?
- A.
50h
- B.
This results in compile time error'Number Frame Exception'
- C.
This results in runtime error 'Number Format Exception'
- D.
50
- 13.boolean b; System.out.println(b); What is the output of the above program?
- A.
True
- B.
False
- C.
Null
- D.
0
- 14.Which will legally declare, construct, and initialize an array?
- A.
Int [] myList = {"1", "2", "3"};
- B.
Int [] myList = (5, 8, 2);
- C.
Int myList [] [] = {4,9,7,0};
- D.
Int myList [] = {4, 3, 7};
- 15.What gets printed when the following program is compiled and run. Select the one correct answer. class test { public static void main(String args[]) { int i,j,k,l=0; k = l++; j = ++k; i = j++; System.out.println(i); } }
- A.
0
- B.
1
- C.
2
- D.
3
Questions: 6 | Attempts: 6967 | Last updated: Mar 22, 2022
-
Sample QuestionAll of the following are Boolean Operators: AND, OR, NOT.
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