1. For the following:
public class Test {
public static void main(String args[]) {
Scanner scan = new Scanner("1234");
System.out.println(scan.nextInt());
}
}
a) Gives output: 1234 b) Compile error c) Exception at runtime d) None of the above
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Wrong! The correct answer is a) Gives output: 1234
Correct! Gives output: 1234
2. What is the output?
public class Test {
public static void main(String args[]) {
System.out.println(A.B.C.i);
}
public static class A {
public static class B {
public static class C {
public static int i=8;
static {
i =8;
}
}
}
}
}
a) Compile error : illegal static declaration in inner class b) Compile error : Cannot have nested inner classes c) Gives output: 8 d) Compile error : Cannot access i from main
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Wrong! The correct answer is c) Gives output: 8 All are static and so can be accessed without instance being created
Correct! c) Gives output: 8 All are static and so can be accessed without instance being created
3. What is output?
import java.util.Date;
public class Test {
public static void main(String args[]) {
Date d1 = new Date();
Date d2 = (Date) d1.clone();
System.out.println(d1=d2);
}
}
a) Compile error: Cannot clone Date b) Gives output: false c) Gives output: true d) Prints current date-time
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Wrong! The correct answer is d) Prints current date-time d1=d2 is assignment
Correct! Prints current date-time d1=d2 is assignment
4. public class Test {
public static void main(String args[]) {
String a = "abc";
System.out.println(a.hashCode());
String b = "def";
System.out.println(b.hashCode());
a = a+b;
System.out.println(a.hashCode());
}
}
a) Prints three numbers all of which are same b) First and third numbers are same c) Compile error d) Prints three different numbers
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Wrong! The correct answer is d) Prints three different numbers For String object always a new instance is created
Correct! Prints three different numbers For String object always a new instance is created
5. To prevent a field from being saved when an object is serialized,
The field should be marked as :
a) strictfp b) deserialize c) volatile d) transient
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Wrong! The correct answer is d) transient
Correct! transient
6. For the following :
public class Test {
public static void main(String args[]) {
String [][] names = {
{"Mr.", "Mrs.", "Ms."},
{"John", "Gupta", "Hegde", "Khan"},
{" : M", " : F"}
};
String[][] arrNew = new String[2][2];
System.arraycopy(names, 1, arrNew, 0, 2);
System.out.println(arrNew[0][1] + arrNew[1][0]);
}
}
a) Gives output : Gupta : M b) Gives output : Mrs.John c) Compile Error d) Throws ArrayIndexOutOfBoundsException
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Wrong! The correct answer is a) Gives output : Gupta : M
Correct! Gives output : Gupta : M
7. public class Test extends Parent{
public void calculate() {
System.out.println("in Test");
}
public static void main(String[] args) {
Parent p = new Test();
p.calculate();
}
}
public class Parent {
private void calculate() {
System.out.println("in Parent");
}
}
a) class Test will not compile b) Gives Output: in Test c) Gives Output: in Parent d) class Parent will not compile
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Wrong!The correct answer is a) class Test will not compile calculate() is not visible in Parent
Correct! class Test will not compile calculate() is not visible in Parent
