Short s1 = 100;
Integer s2 = 200;
Long s3 = s1+(long)s2;
System.out.println(s3);
a) Compile error b) Exception thrown c) 200 d) 300
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is d) 300 : s2 int is cast to long, resolving type issue
Correct! 300 : s2 int is cast to long, resolving type issue
2. What is the output?
int var = 9;
if(var++ <10) {
System.out.println(var++ +" Less");
}
else {
System.out.println(var++ +" More");
}
a) 10 More b) 10 Less c) 11 More d) 11 Less
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is b) 10 Less : ++ operator works after usage of variable
Correct! 10 Less : ++ operator works after usage of variable
3. What is the output?
int[] n1 = new int[3];
int[] n2 = {1,2,3,4,5};
n1=n2;
for (int i : n1) {
System.out.print(i+":");
}
a) Compile error
b) Exception thrown
c) 1:2:3:4:5:
d) 1:2:3:
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is c) 1:2:3:4:5:
Correct! 1:2:3:4:5:
4. What changes can make code compile?
1. class P {
2. public void print() {
3. throw new IOException();
4. }
5. }
6. class Test {
7. public static void main(String[] args) {
8. P p = new P();
9. p.print();
10. }
11.}
A. add throws IOException at line 2
B. add throws IOException at line 7
C. try/catch at line 9
D. add throws Exception at line 2
a) A or B with C b) A with B or C c) B with C d) A or D
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is b) A with B or C : Checked exceptions have to be caught or declared in throws clause
Correct! A with B or C Checked exceptions have to be caught or declared in throws clause
5. Which lines do not compile?
1. int i = 25;
2. float f = 10.3f;
3. double d = 20.1;
4. i = f;
5. f= i;
6. d= f;
7. f = d;
8. d= i;
9. i = d;
a) 4, 7, 9 b) 7, 9 c) 4, 5, 7, 9 d) 5, 7, 9
Wrong! Try again..
Wrong Again! Try one more chance.
Wrong! The correct answer is a) 4, 7, 9 : int can be assigned to float and both to double
Correct! 4, 7, 9 int can be assigned to float and both to double
6. What should be added at XX and YY to get ouput 235?
int[] arr = {1,2,3,4,5,6};
for (int i=0;i<arr.length;i++) {
if(i<2) {
XX
}
System.out.print(i);
if(i==3) {
YY
}
}
a) continue and break b) continue and continue c) continue and i++ d) continue at XX only
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is c) continue and i++ : continue abandons current cycle of the loop and goes to next iteration
Correct! continue and i++ : continue abandons current cycle of the loop and goes to next iteration
7. What is the output?
String [][] arr = new String[2][];
arr[0] = new String[2];
arr[1] = new String[3];
int i = 85;
for (int j = 0; j < arr.length; j++) {
for (int k = 0; k < arr.length; k++) {
arr[j][k] = ""+i;
i++;
}
}
for(String[] a :arr) {
for(String b:a) {
System.out.print(b+" ");
}
}
a) 85 86 87 88 89 b) 85 86 87 88 c) 85 87 86 88 null d) 85 86 87 88 null
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is d) 85 86 87 88 null : inner loop runs twice only
