MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1671 Mcqs, each offering curated multiple-choice questions to sharpen your Technical Programming knowledge and support exam preparation. Choose a topic below to get started.
| 1401. |
What is the output of this program? class access { static int x; void increment() { x++; } } class static_use { public static void main(String args[]) { access obj1 = new access(); access obj2 = new access(); obj1.x = 0; obj1.increment(); obj2.increment(); System.out.println(obj1.x + " " + obj2.x); } } |
| A. | 1 2 |
| B. | 1 1 |
| C. | 2 2 |
| D. | Compilation Error |
| Answer» D. Compilation Error | |
| 1402. |
What is the output of this program? class access { public int x; static int y; void cal(int a, int b) { x += a ; y += b; } } class static_specifier { public static void main(String args[]) { access obj1 = new access(); access obj2 = new access(); obj1.x = 0; obj1.y = 0; obj1.cal(1, 2); obj2.x = 0; obj2.cal(2, 3); System.out.println(obj1.x + " " + obj2.y); } } |
| A. | 1 2 |
| B. | 2 3 |
| C. | 3 2 |
| D. | 1 5 |
| Answer» E. | |
| 1403. |
Which of these methods must be made static? |
| A. | main() |
| B. | delete() |
| C. | run() |
| D. | finalize() |
| Answer» B. delete() | |
| 1404. |
Which of these cannot be declared static? |
| A. | class |
| B. | Object |
| C. | variable |
| D. | Method |
| Answer» C. variable | |
| 1405. |
Which of these keywords is used to prevent content of a variable from being modified? |
| A. | Final |
| B. | Last |
| C. | constant |
| D. | static |
| Answer» B. Last | |
| 1406. |
Arrays in Java are implemented as? |
| A. | class |
| B. | object |
| C. | variable |
| D. | none of the mentioned |
| Answer» C. variable | |
| 1407. |
Which is the modifier when there is none mentioned explicitly? |
| A. | protected |
| B. | Private |
| C. | public |
| D. | default |
| Answer» E. | |
| 1408. |
Can a class be declared with protected modifier? |
| A. | True |
| B. | False |
| Answer» C. | |
| 1409. |
How many copies of static and class variables are created when 10 objects are created of a class? |
| A. | 1, 10 |
| B. | 10, 10 |
| C. | 10, 1 |
| D. | 1, 1 |
| Answer» B. 10, 10 | |
| 1410. |
What is true of final class? |
| A. | Final class cause compilation failure |
| B. | Final class cannot be instantiated |
| C. | Final class cause runtime failure |
| D. | Final class cannot be inherited |
| Answer» E. | |
| 1411. |
All the variables of interface should be ? |
| A. | default and final |
| B. | default and static |
| C. | public,static and final |
| D. | protect, static and final |
| Answer» D. protect, static and final | |
| 1412. |
What happens if constructor of class A is made private? |
| A. | Any class can instantiate objects of class A |
| B. | Objects of class A can be instantiated only within the class where it is declared |
| C. | Inherited class can instantiate objects of class A |
| D. | classes within the same package as class A can instantiate objects of class A |
| Answer» C. Inherited class can instantiate objects of class A | |
| 1413. |
How can a protected modifier be accessed? |
| A. | accessible only within the class |
| B. | accessible only within package |
| C. | accessible within package and outside the package but through inheritance only |
| D. | accessible by all |
| Answer» D. accessible by all | |
| 1414. |
Which of the following modifier means a particular variable cannot be accessed within the package? |
| A. | private |
| B. | public |
| C. | protected |
| D. | default |
| Answer» B. public | |
| 1415. |
All the variables of class should be ideally declared as ? |
| A. | private |
| B. | public |
| C. | protected |
| D. | Default |
| Answer» B. public | |
| 1416. |
Which one of the following is not an access modifier? |
| A. | Public |
| B. | Private |
| C. | Protected |
| D. | Void |
| Answer» E. | |
| 1417. |
Which of these access specifier must be used for class so that it can be inherited by another subclass? |
| A. | public |
| B. | private |
| C. | protected |
| D. | none of the mentioned |
| Answer» B. private | |
| 1418. |
What is the output of this program? class static_out { static int x; static int y; void add(int a, int b) { x = a + b; y = x + b; } } class static_use { public static void main(String args[]) { static_out obj1 = new static_out(); static_out obj2 = new static_out(); int a = 2; obj1.add(a, a + 1); obj2.add(5, a); System.out.println(obj1.x + " " + obj2.y); } } |
| A. | 7 7 |
| B. | 6 6 |
| C. | 7 9 |
| D. | 9 7 |
| Answer» D. 9 7 | |
| 1419. |
What is the output of this program? class access { public int x; private int y; void cal(int a, int b) { x = a + 1; y = b; } void print() { system.out.println(" " + y); } } class access_specifier { public static void main(String args[]) { access obj = new access(); obj.cal(2, 3); System.out.println(obj.x); obj.print(); } } |
| A. | 2 3 |
| B. | 3 3 |
| C. | Runtime Error |
| D. | Compilation Error |
| Answer» C. Runtime Error | |
| 1420. |
What is the output of this program? class access { public int x; private int y; void cal(int a, int b) { x = a + 1; y = b; } } class access_specifier { public static void main(String args[]) { access obj = new access(); obj.cal(2, 3); System.out.println(obj.x + " " + obj.y); } } |
| A. | 3 3 |
| B. | 2 3 |
| C. | Runtime Error |
| D. | Compilation Error |
| Answer» D. Compilation Error | |
| 1421. |
What is the process by which we can control what parts of a program can access the members of a class? |
| A. | Polymorphism |
| B. | Abstraction |
| C. | Encapsulation |
| D. | Recursion |
| Answer» D. Recursion | |
| 1422. |
Which of these is used as default for a member of a class if no access specifier is used for it? |
| A. | private |
| B. | public |
| C. | public, within its own package |
| D. | protected |
| Answer» B. public | |
| 1423. |
Which of these is used to access member of class before object of that class is created? |
| A. | Public |
| B. | Private |
| C. | static |
| D. | protected |
| Answer» D. protected | |
| 1424. |
Which of these access specifiers must be used for main() method? |
| A. | private |
| B. | public |
| C. | protected |
| D. | none of the mentioned |
| Answer» C. protected | |
| 1425. |
What is the output of this program? class test { int a; int b; test(int i, int j) { a = i; b = j; } void meth(test o) { o.a *= 2; O.b /= 2; } } class Output { public static void main(String args[]) { test obj = new test(10 , 20); obj.meth(obj); System.out.println(obj.a + " " + obj.b); } } |
| A. | 10 20 |
| B. | 20 10 |
| C. | 20 40 |
| D. | 40 20 |
| Answer» C. 20 40 | |
| 1426. |
What is the output of this program? class test { int a; int b; void meth(int i , int j) { i *= 2; j /= 2; } } class Output { public static void main(String args[]) { test obj = new test(); int a = 10; int b = 20; obj.meth(a , b); System.out.println(a + " " + b); } } |
| A. | 10 20 |
| B. | 20 10 |
| C. | 20 40 |
| D. | 40 20 |
| Answer» B. 20 10 | |
| 1427. |
What is the output of this program? class overload { int x; double y; void add(int a , int b) { x = a + b; } void add(double c , double d) { y = c + d; } overload() { this.x = 0; this.y = 0; } } class Overload_methods { public static void main(String args[]) { overload obj = new overload(); int a = 2; double b = 3.2; obj.add(a, a); obj.add(b, b); System.out.println(obj.x + " " + obj.y); } } |
| A. | 6 6 |
| B. | 6.4 6.4 |
| C. | 6.4 6 |
| D. | 4 6.4 |
| Answer» E. | |
| 1428. |
What is the output of this program? class overload { int x; int y; void add(int a) { x = a + 1; } void add(int a , int b) { x = a + 2; } } class Overload_methods { public static void main(String args[]) { overload obj = new overload(); int a = 0; obj.add(6, 7); System.out.println(obj.x); } } |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 9 |
| Answer» D. 9 | |
| 1429. |
What is the output of this program? class overload { int x; int y; void add(int a) { x = a + 1; } void add(int a, int b) { x = a + 2; } } class Overload_methods { public static void main(String args[]) { overload obj = new overload(); int a = 0; obj.add(6); System.out.println(obj.x); } } |
| A. | 5 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» D. 8 | |
| 1430. |
What is the output of the following code? class San { public void m1 (int i,float f) { System.out.println(" int float method"); } public void m1(float f,int i); { System.out.println("float int method"); } public static void main(String[]args) { San s=new San(); s.m1(20,20); } } |
| A. | int float method |
| B. | float int method |
| C. | compile time error |
| D. | run time error |
| Answer» D. run time error | |
| 1431. |
What is the process of defining a method in terms of itself, that is a method that calls itself? |
| A. | Polymorphism |
| B. | Abstraction |
| C. | Encapsulation |
| D. | Recursion |
| Answer» E. | |
| 1432. |
Which of these is correct about passing an argument by call-by-value process? |
| A. | Copy of argument is made into the formal parameter of the subroutine |
| B. | Reference to original argument is passed to formal parameter of the subroutine |
| C. | Copy of argument is made into the formal parameter of the subroutine and changes made on parameters of subroutine have effect on original argument |
| D. | Reference to original argument is passed to formal parameter of the subroutine and changes made on parameters of subroutine have effect on original argument |
| Answer» B. Reference to original argument is passed to formal parameter of the subroutine | |
| 1433. |
Which of these can be overloaded? |
| A. | Methods |
| B. | Constructors |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 1434. |
What is process of defining two or more methods within same class that have same name but different parameters declaration? |
| A. | method overloading |
| B. | method overriding |
| C. | method hiding |
| D. | none of the mentioned |
| Answer» B. method overriding | |
| 1435. |
Garbage Collection can be controlled by program? |
| A. | True |
| B. | False |
| Answer» C. | |
| 1436. |
Which of the below is not a memory leak solution? |
| A. | Code changes |
| B. | JVM parameter tuning |
| C. | Process restart |
| D. | GC parameter tuning |
| Answer» D. GC parameter tuning | |
| 1437. |
Which of the below is not a Java Profiler? |
| A. | JVM |
| B. | JConsole |
| C. | JProfiler |
| D. | Eclipse Profiler |
| Answer» B. JConsole | |
| 1438. |
What happens to thread when garbage collection kicks off? |
| A. | The thread continues its operation |
| B. | Garbage collection cannot happen until the thread is running |
| C. | The thread is paused while garbage collection runs |
| D. | The thread and garbage collection do not interfere with each other |
| Answer» D. The thread and garbage collection do not interfere with each other | |
| 1439. |
How to get prints of shared object memory maps or heap memory maps for a given process? |
| A. | jmap |
| B. | memorymap |
| C. | memorypath |
| D. | jvmmap |
| Answer» B. memorymap | |
| 1440. |
Which exception is thrown when java is out of memory? |
| A. | MemoryFullException |
| B. | MemoryOutOfBoundsException |
| C. | OutOfMemoryError |
| D. | MemoryError |
| Answer» D. MemoryError | |
| 1441. |
What is -Xms and -Xmx while starting jvm? |
| A. | Initial; Maximum memory |
| B. | Maximum; Initial memory |
| C. | Maximum memory |
| D. | Initial memory |
| Answer» B. Maximum; Initial memory | |
| 1442. |
Which of the following is a garbage collection technique? |
| A. | Cleanup model |
| B. | Mark and sweep model |
| C. | Space management model |
| D. | Sweep model |
| Answer» C. Space management model | |
| 1443. |
Where is a new object allocated memory? |
| A. | Young space |
| B. | Old space |
| C. | Young or Old space depending on space availability |
| D. | JVM |
| Answer» B. Old space | |
| 1444. |
Which of the following has highest memory requirement? |
| A. | Heap |
| B. | Stack |
| C. | JVM |
| D. | Class |
| Answer» D. Class | |
| 1445. |
What would be behaviour if constructor has a return type? |
| A. | Compilation error |
| B. | Runtime error |
| C. | Compilation and runs successfully |
| D. | Only String return type is allowed |
| Answer» B. Runtime error | |
| 1446. |
What would be the behaviour if one parameterized constructor is explicitly defined? |
| A. | Compilation error |
| B. | Compilation succeeds |
| C. | Runtime error |
| D. | Compilation succeeds but at the time of creating object using default constructor, it throws compilation error |
| Answer» E. | |
| 1447. |
What is not the use of “this” keyword in Java? |
| A. | Passing itself to another method |
| B. | Calling another constructor in constructor chaining |
| C. | Referring to the instance variable when local variable has the same name |
| D. | Passing itself to method of the same class |
| Answer» E. | |
| 1448. |
What is true about protected constructor? |
| A. | Protected constructor can be called directly |
| B. | Protected constructor can only be called using super() |
| C. | Protected constructor can be used outside package |
| D. | protected constructor can be instantiated even if child is in a different package |
| Answer» C. Protected constructor can be used outside package | |
| 1449. |
Abstract class cannot have a constructor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 1450. |
What is true about constructor? |
| A. | It can contain return type |
| B. | It can take any number of parameters |
| C. | It can have any non access modifiers |
| D. | Constructor cannot throw exception |
| Answer» C. It can have any non access modifiers | |