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anilbachi SCJP Practice
Exams
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chapter1 | chapter2 | chapter3 | chapter4 | chapter5 | chapter6 | |
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Chapter 2: Operators and Assignments Questions Q1:The java operator which performs a right shift of an integer primitive value without extending the sign bit. a).>> b).>>> c).<<
Q2:What is the output of the following statement. X=20; System.out.println(x++); a).20 b).19 c).21 d).0
Q3:Which of the following assignments causes a compile error with the following variables defined. char c; int i; a). c='A'; b). i=10; c). i=c; d). c=i+1;
Q4: State the value of flags[0] when the following statement is compiled . boolean flags[]=new boolean[100]; a).true b).null c).NULL d).false
Q5:Given two int variables initialized as follows: int a=63; int b=4; what is the value of a&b. a).63 b).4 c).null d).0
Q6:Given two int variables initialized as follows. int a=63; int b=4; what is the value of a&&b? a).63 b).4 c).null d).runtime exception occurs can't convert int to boolean.
Q7: Given two int variables initialized as follows: int a=63; int b=4; which of the following expression initializes c to 59. a).int c=a | b; b).int c=a ^ b; c).int c=a & b; d).int c=a >> b;
Q8:Given the following variable declarations boolean b=false; Boolean a=new Boolean(); state the consequence of the following statement: if(a.equals(b)) System.out.println("Equal"); else System.out.println("Not equal"); a).output is Not equal .b).output is equal c).the code will not compile d).none Q9:Which of the following assignments are invalid a). double d=2.3; b). byte b=12; c). int I='12'; d). float f=2.3; e). short s=28;
Q10:State the possible output of the following statements int a=12; System.out.println(a/0); a).0 b).null c).infinity d).a compile time exception occurs.
Q11:State the output of the following statements double d=3.123; int i=0; System.out.println(d/i); a).0 b).null c).an Arithmetic Exception is generated d).infinity
Q12:Which of the following operation are known as short circuit operators a). & b). | c). && d). || e). a and b f).c and d g).none
Q13:State the output of the following code public class short{ public static void main(String args()){ int t=0; boolean t=true; boolean f=false,b; b=(t || ((i++) ==0)); b=(f || ((i+=2)>0)); System.out.println(i); }} a).0 b).1 c).2 d).3
Q14:What is default integer primitive a).char b).short c).int d).long
Q!5:Java is entitled with which of the following types of operators. a).unary b).binary c).ternary d).a,b e).a,b,c
Q16:Which among the following is a valid conversion a). integer to boolean primitive b). Numeric to reference variable c).Reference to Numeric d).between two array types e).byte to integer
Q17:Which among the following statements are true in case of a arithmetic expression evaluation a).if either operand is a double,the other is converted to double b).if either operand is a float the other is converted to float c).if either operand is of type long then the other is conveted to long d).if either operand is of type int the other is converted to int e).if either operand is a short the other is converted to short f).all the above
Q18:A byte variable is declared as byte X=0; the expression X+=4; is equivalent to a). X=X+4; b). X=(byte)X+4; c). X=(byte)(X+4); d). none
Q19: Two short variables are declared as short a=10; short b=11; the result of the following assignments is short d=a & b ; a).no error occurs and result is 10 b).a compiler error occurs "Explicit cast is required to convert int to short". c).none
Q20:Given the following variables int X=10; int Y=12; select the correct answer for the following statement if (X>1 || Y<12) a).both operands are evaluated b).first operand only is evaluated c).seconnd operand only is evaluated d).no operand is evaluated
Q21:The following code creates a long object and an Integer object,both with the same value. Long c=new Long(42); Integer b=new Integer(42); if(a.equals(b)) System.out.println("Equal"); else System.out println("Notequal"); what is the output when the two objects are compared with the equals method? a). Equal b). Notequal
Q22:The folowing codes creates two Integer objects having the same value: Integer X=new Integer(97); Integer Y=new Integer(97); if(X==Y) System.out.println("Equal"); else System.out.println("Not Equal"); what is the result when the two objects are compared ? a). Equal b). Not Equal
Q23:Given the following code: 1. String X="one"; 2. String Y="two"; 3. X+=Y+"three"; what is contained in X? a). one two b). one two three c). two three d). null
Q24:What is the result of compiling the code String a="file"; String b=".txt"; String c=a-b; a). c contains "file" b). c contains "file.txt" c). results in compiletime error d). c contains null
Q25:What is the result after the following code is executed 1. int X=2; 2. int Y=3; 3. int Z=(X=Y)*X+Y; a). X contains 3, Y contains 7 b). X contains 2,Y contains7 c). X contains 3,Y contains 12 d). X contains 3,Y contains 18
Q26:Which of the following statements are invalid a). address instanceof Object b). address instanceof String c). address instanceof 100 d). address instanceof Object[]
Q27:Which of the following statements are valid a).address instanceof null b).address instanceof NULL c).address instanceof 100 d).address instanceof Object
Q28:Which of the following operators evaluates both the operands always. a). && b). & c). || d). none
Q29: Given a is an integer what can be said about c after the statement int c=a<<2; a). the result is always positive b).the result is always negative c).the result is may be positive or negative
Q30:Which operator is used to perform bitwise inversion in java a). ~ b). ! c). & d). | e). ^
Q31:Given a byte variable byte X=3 state the result of (byte)~X; a).3 b).0 c).-4 d).-3
Q32:Which operator is an bitwise exclusive or a). & b). ^ c). | d). ~
Q33:Given two integers by X=5>>2; Y=X>>>2; state the value of Y a).5 b).2 c).80 d).0 e).64 answer:d Q34:State the output of the following code public class test{ public static void main(String args()){ int X=0,Y=1,Z; if(X) Z=0; else Z=1; if(Y) Z=2; else Z=3 System.out.println(Z); a).0 b).1 c).2 d).3 e).results in a compile time error
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