Predict the output:public class Test extends Thread{ private int i; public void run(){ i++; } public static void main(String[] args){ Test a = new Test(); a.run(); System.out.print(a.i); a.start(); System.out.print(a.i); }} Compiler error Prints Prints Prints IllegalThreadStateException is thrown TRUE ANSWER : ? YOUR ANSWER : ?
Analyze the following code:public abstract class Test implements Runnable{ public void doSomething() { };} The program will not compile because it does not implement the run() method. The program compiles fine. None of these The program will not compile because it does not contain abstract methods. TRUE ANSWER : ? YOUR ANSWER : ?
What will be the output?class One extends Thread{public void run(){for(int i=0; i<2; i++){System.out.print(i);}}}public class Test{public static void main(String args[]){Test t = new Test();t.call(new One());} public void call(One o){o.start();}} Compilation Error None of these 0 1 0 0 TRUE ANSWER : ? YOUR ANSWER : ?
Given the code. What will be the result?public class Test implements Runnable{ public static void main(String[] args) throws InterruptedException{ Thread a = new Thread(new Test()); a.start(); System.out.print("Begin"); a.join(); System.out.print("End"); } public void run(){ System.out.print("Run"); }} "BeginEnd" is printed. Compilation fails. "BeginEndRun" is printed. "BeginRunEnd" is printed. An exception is thrown at runtime. TRUE ANSWER : ? YOUR ANSWER : ?
What is the output for the below code ?class A implements Runnable{ public void run(){ System.out.println(Thread.currentThread().getName()); }}1. public class Test{2. public static void main(String... args){3. A a = new A();4. Thread t = new Thread(a);5. t.setName("good");6. t.start();7. }8. } Compilation fails with an error at line 5 null None of these Compilation succeed but Runtime Exception good TRUE ANSWER : ? YOUR ANSWER : ?
When a class extends the Thread class ,it should override ............ method of Thread class to start that thread. run() go() init() start() TRUE ANSWER : ? YOUR ANSWER : ?
Which keyword when applied on a method indicates that only one thread should execute the method at a time. final static native synchronized volatile TRUE ANSWER : ? YOUR ANSWER : ?
Analyze the following code:public class Test implements Runnable{ public static void main(String[] args){ Test t = new Test(); t.start(); } public void run() { }} The program compiles, but it does not run because the run() method is not implemented. The program compiles and runs fine. The program compiles, but it does not run because the start() method is not defined. The program does not compile because the start() method is not defined in the Test class. TRUE ANSWER : ? YOUR ANSWER : ?
What will happen when you attempt to compile and run the following code?class A implements Runnable{ public void run(){ System.out.println("run-A"); }}1. public class Test{2. public static void main(String argv[]){3. A a = new A();4. Thread t = new Thread(a);5. System.out.println(t.isAlive());6. t.start();7. System.out.println(t.isAlive());8. }9. } Compilation fails due to an error on line 7 false run-A true true run-A true None of these false run-A false TRUE ANSWER : ? YOUR ANSWER : ?
What notifyAll() method do? None of these Wakes up all threads that are waiting on this object's monitor Wakes up one threads that are waiting on this object's monitor Wakes up all threads that are not waiting on this object's monitor TRUE ANSWER : ? YOUR ANSWER : ?