class MyResource1 implements AutoCloseable {
public void close() { System.out.print("1 "); } // A1
}
class MyResource2 implements AutoCloseable {
public void close() { System.out.print("2 "); } // A2
}
public class Triangle {
public static void main(String[] args) {
try ( MyResource1 r1 = new MyResource1(); MyResource2 r2 = new MyResource2();) { // B
System.out.print("t ");
}
finally {
System.out.print("f ");
}
}
}
a) Gives output: t 2 1 f b) Compilation fails due to an error on line B c) Compilation fails due to an error on lines A1, A2, B d) Compilation fails due to an error on lines A1, A2
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is a) Gives output: t 2 1 f
Correct! Gives output: t 2 1 f
2. Which are correct?
StringBuilder sb = new StringBuilder();
A. sb.deleteAll();
B. sb.delete(0, sb.size());
C. sb.delete(0, sb.length());
D. sb.removeAll();
a) A, B b) C, D c) A, C d) C
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is d) C
Correct! d) C
3. Which is most closely associated with the object-oriented design concept known as "has-a"?
a) log3:false, log4:true b) log3:true, log4:false c) log3:false, log4:false d) log3:true, log4:true
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is d) log3:true, log4:true
Correct! log3:true, log4:true
5. What is the output?
String name = "Nitin";
Runnable r1 = ()->System.out.println(name);
name += " M";
Runnable r2 = ()->System.out.println(name);
r2.run();
a) Nitin, Nitin M b) Nitin M c) Exception thrown d) Compile error
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is d) Compile error : name is effectively final, cannot modify it
Correct! Compile error. name is effectively final, cannot modify it
6. Using JDK 1.7, what is the output?
public class Triangle {
public static void main(String[] args) {
try ( MyResource1 r1 = new MyResource1(); MyResource2 r2 = new MyResource2();) {
System.out.print("t ");
}
finally {
System.out.print("f ");
}
}
}
class MyResource1 implements AutoCloseable {
public void close() {
System.out.print("1 ");
}
}
class MyResource2 implements AutoCloseable {
public void close() {
System.out.print("2 ");
}
}
a) t 2 1 f b) 2 1 t f c) t 1 2 f d) Compile Error
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is a)t 2 1 f
Correct! t 2 1 f
7. What is output ?
public class Test {
public Test() {
short s = 1; int i = 2; long l = 3L;
doIt(s); doIt(i); doIt(l);
}
private void doIt(Short s) {
System.out.println("short:"+s);
}
private void doIt(int i) {
System.out.println("int:"+i);
}
private void doIt(long l) {
System.out.println("long:"+l);
}
public static void main(String[] args) {
new Test();
}
}
a) Compile error b) short:1 int:2 long:3 c) int:1 int:2 long:3 d) long:1 long:2 long:3
Wrong! Try again.
Wrong Again! Try one more chance.
Wrong! The correct answer is c) int:1 int:2 long:3 Use casting doIt((Short)s); or change signature private void doIt(short s)
Correct! int:1 int:2 long:3 Use casting doIt((Short)s); or change signature private void doIt(short s)
