a) date1 : 2016-Dec-23, date2 : 2017-04-03 b) date1 : 2016-12-23, date2 : 2017-04-03 c) date1 : 2016-12-23, date2 : 03-Apr-2017 d) date1 : 2016-Dec-23, date2 : 2017-Apr-03
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is b) date1 : 2016-12-23, date2 : 2017-04-03
Correct! date1 : 2016-12-23, date2 : 2017-04-03
2. What is the output?
public class ForLoopTest {
public static void main(String[] args) {
int ii = 0;
int jj = 7;
for (ii = 0; ii < jj-1; ii=ii+2) {
System.out.print(ii +" ");
}
}
}
a) 0 3 6 b) 0 2 4 6 c) 0 2 4 d) Compile error
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is c) 0 2 4
Correct! 0 2 4
3. What is the output?
public class Printer {
int copy;
static int cp;
public Printer(int copy) {
if(cp<copy) {
cp=copy;
this.copy = copy;
}
}
void print() {
System.out.println("copy="+copy+" & cp="+cp);
}
}
public class Test {
public static void main(String[] args) {
Printer p1 = new Printer(25);
Printer p2 = new Printer(75);
Printer p3 = new Printer(50);
p1.print();
p2.print();
p3.print();
}
}
Wrong! The correct answer is a) copy=25 & cp=75, copy=75 & cp=75, copy=0 & cp=75 cp is static and shared by all instances
Correct! copy=25 & cp=75, copy=75 & cp=75, copy=0 & cp=75 cp is static and shared by all instances
4. What is the output?
public class Test {
public static void main(String[] args) {
String[] alphabets = {"A", "B", "C", "D", "E"};
for (int i = 0; i < alphabets.length; i++) {
System.out.print(alphabets[i] +" ");
if(alphabets[i].equals("C")) {
continue;
}
System.out.println("Done");
break;
}
}
}
a) A B C D Done b) A B C Done c) A Done d) ArrayIndexOutOfBoundsException
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is c) A Done 'break' stops the loop
Correct! A Done 'break' stops the loop
5. What code should be placed at XX to get output 10:20 ?
public class Test {
public static void main(String[] args) {
XX
arr[0] = 10;
arr[1] = 20;
System.out.println(arr[0]+":"+arr[1]);
}
}
a) int[] arr = new int[2]{10,20}; b) int arr = new int[2]; c) int arr[2]; d) int[] arr = new int[2];
Wrong! Try again..
Wrong Again! Try one more chance.
Wrong! The correct answer is d) int[] arr = new int[2];Arrays have to be declared and created with size
Correct! int[] arr = new int[2]; Arrays have to be declared and created with size
6. What is the output?
public class Test {
public static void main(String[] args) {
List<String> colors= new ArrayList<>();
colors.add("yellow");
colors.add("green");
colors.add("red");
colors.add("blue");
if(colors.remove("red")) {
colors.remove("green");
}
System.out.println(colors);
}
}
a) [yellow, green, blue] b) [yellow, blue] c) [yellow, green, red, blue] d) Compile error
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is b) [yellow, blue] : remove() returns true if successful
Correct! [yellow, blue] : remove() returns true if successful
7. To make the code compile:
public interface Liftable {
public void liftLoad();
public void setHook();// AA
}
public abstract class Vehicle implements Liftable { // BB
public void liftLoad() {}
// XX
}
public class Crane extends Vehicle {
public void liftLoad() {}
// YY
}
a) Change code at line AA to : default public void setHook(); b) Change code at line BB to : public class Vehicle implements Liftable c) Add code at line XX: public abstract void setHook() {} d) Add code at line YY: public void setHook() {}
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is d) Add code at line YY: public void setHook() {} abstract method has to be implemented
Correct! Add code at line YY: public void setHook() {} abstract method has to be implemented
