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programming languages Online Quiz - 180

Description: programming languages Online Quiz - 180
Number of Questions: 20
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Tags: programming languages
Attempted 0/20 Correct 0 Score 0

The parameter Id of the field will be mentioned at what level?

  1. Domain

  2. Data element

  3. Technical settings

  4. None of the above


Correct Option: B

What is T-code for Database Utility?

  1. SE15

  2. SE14

  3. SE16

  4. SM30


Correct Option: B

REPORT ZTEST. statics: a(3) type c value ‘10’. data: b(3) type c value ‘10’. Do 5 times. perform add using a b. enddo. write: a,b. form ADD using a b. if sy-index eq 3. exit. else. a = a + 1. b = b + 1. endif. endform. " ADD What is the values of a and b?

  1. 10,13

  2. 10,14

  3. 14,14

  4. Syntax error


Correct Option: D

Which is the most suitable Java collection class for storing various companies and their stock prices? It is required that the class should support synchronization inherently.

  1. Hashtable

  2. Hashmap

  3. Linked Hashmap

  4. Hashset


Correct Option: A

Which of the following statements is not true about threads?

  1. If the start() method is invoked twice on the same Thread object, an exception is thrown at runtime.

  2. The order in which threads were started might differ from the order in which they actually run.

  3. If the run() method is directly invoked on a Thread object, an exception is thrown at runtime.

  4. If the sleep() method is invoked on a thread while executing synchronized code, the lock is not released.


Correct Option: C
Explanation:

To answer this question one needs to know about threads in programming. Threads are the smallest unit of execution that can be scheduled by an operating system. Each thread represents a separate flow of control. Threads are lightweight compared to processes, and they share memory with other threads in the same process.

Now let's go through each option and explain why it is true or false:

A. If the start() method is invoked twice on the same Thread object, an exception is thrown at runtime.

This statement is true. If the start() method is invoked twice on the same Thread object, an exception (IllegalThreadStateException) is thrown at runtime.

B. The order in which threads were started might differ from the order in which they actually run.

This statement is true. The operating system schedules threads based on its own algorithm, which might differ from the order in which the threads were started.

C. If the run() method is directly invoked on a Thread object, an exception is thrown at runtime.

This statement is false. If the run() method is directly invoked on a Thread object, the run() method will execute just like any other method. However, it will not start a new thread of execution, and any other code that is waiting for the thread to complete will not be notified.

D. If the sleep() method is invoked on a thread while executing synchronized code, the lock is not released.

This statement is true. When a thread invokes the sleep() method while executing synchronized code, the lock associated with the synchronized code is not released. This means that other threads that require the same lock will have to wait until the sleeping thread releases the lock.

Therefore, the correct answer is: C. If the run() method is directly invoked on a Thread object, an exception is thrown at runtime.

  1. sets a bit to 1 if both operand's bits are 1

  2. sets a bit to 1 if only one operand's bit is 1.

  3. sets a bit to 1 if at least one operand's bit is 1

  4. reverses the value of every bit in the operand


Correct Option: A

Select the new keyword since J2SE 1.4

  1. abstract

  2. assert

  3. synchronized

  4. strictfp


Correct Option: B

Assume the bit pattern of byte x is: 10110001. What will the sign of x be after x>>2?

  1. postive

  2. negative

  3. can't be find

  4. none of the above


Correct Option: B

What happens when you compare two primitives of different numerical types?

  1. compiler error

  2. smaller type is promoted

  3. must explicitly cast

  4. none of the above


Correct Option: B

All exceptions inherit from

  1. java.lang.Exception

  2. java.lang.Error

  3. java.lang.Throwable

  4. none of the above


Correct Option: C

package polymorphism; class TestSup { static int p = 100; } public class TestPoly extends TestSup { public static void main(String[] args) { TestPoly TP = new TestPoly(); TP.p = 400; TestSup TS = new TestSup(); TS.p = 100; TestSup TSP = new TestPoly(); TSP.p = 500; System.out.print("TestSup = " + TestSup.p); System.out.print(" ,TestPoly = " + TestPoly.p); System.out.print(" ,TP = " + TP.p); System.out.print(" ,TS = " + TS.p); System.out.print(" ,TSP = " + TSP.p); } }

  1. TestSup = 100 ,TestPoly = 400 ,TP = 500 ,TS = 500 ,TSP = 500

  2. TestSup = 500 ,TestPoly = 500 ,TP = 500 ,TS = 500 ,TSP = 500

  3. TestSup = 100 ,TestPoly = 400 ,TP = 400 ,TS = 100 ,TSP = 500

  4. TestSup = 500 ,TestPoly = 400 ,TP = 500 ,TS = 100 ,TSP = 400


Correct Option: B

package polymorphism; class TestPolymorphismSuper { int p; TestPolymorphismSuper testPoly() { TestPolymorphismSuper TS = new TestPolymorphismSuper(); TS.p =100; return TS; } } public class TestPolymorphism1 extends TestPolymorphismSuper{ TestPolymorphism1 testPoly() { TestPolymorphism1 TSub = new TestPolymorphism1(); TSub.p =500; return TSub; } public static void main(String[] args) { TestPolymorphismSuper TSuper = new TestPolymorphism1(); TSuper = TSuper.testPoly(); System.out.println(TSuper.p); } }

  1. 500

  2. 100

  3. 0

  4. Null Pointer Exception


Correct Option: A

package polymorphism; class TestSuperr { double TestPoly(long a, float b, int c) { return ((a + b) * c); } } public class TestPolym extends TestSuperr { double TestPoly(long a, double b, int c) { return (a + b + c); } public static void main(String[] args) { TestSuperr TSU = new TestPolym(); double p = TSU.TestPoly(11, 9, 10); System.out.print("p = " + p); p1 = TSU.TestPoly(11, 9.0, 10); System.out.print(" ,p1 = " + p1); } }

  1. Compiler Error

  2. p = 200.0, p1 = 30.0

  3. p = 200.0, p1 = 200.0

  4. p = 30.0, p1 = 30.0


Correct Option: A

package exceptions; public class TestException4 { static String trimString(String x) { return x.trim(); } public static void main(String[] args) { try { String s = trimString(" tcs "); System.out.println("s = "+s); } finally { System.out.println("In finally"); } } }

  1. s = tcs In finally

  2. Compiler Error

  3. Exception

  4. s = tcs


Correct Option: A
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