SCJP model question answer pagr 8

70)

if(0.0 == -0.0) {

  System.out.println("true");

}

else{

    System.out.println("false");

}

prints false

prints true

Ans: 2

71)

class C {

public static void main(String[] args) {

double d1 = Math.floor(0.5);

double d2 = Math.floor(1.5);

System.out.print(d1 + "," + d2);

}}

Prints: 0.0,1.0

Prints: 0.0,2.0

Prints: 1.0,1.0

Prints: 1.0,2.0

None of the above

Ans: 1

72)

System.out.println("String".substring(0,4));

This statement will Print

will print "Strin"

will print "Stri"

will cause compiler error

none of the above

Ans: 2

73)

if("String".replace('t','T') == "String".replace('t','T'))

System.out.println("Equal");

else

System.out.println("Not Equal");

will Print Equal

will Print Not Equal

compile time error

none of the above

Ans: 2

74)

Which of the following classes  will not allow unsynchronized read operations by multiple threads?

Vector

TreeMap

TreeSet

HashMap

HashSet

Ans: 1

75)

StringBuffer objects once created can not be modified

true

false

Ans: 2