- All Known Subinterfaces:RunnableFuture, RunnableScheduledFutureAll Known Implementing Classes:AsyncBoxView.ChildState, ForkJoinWorkerThread,
FutureTask, RenderableImageProducer, SwingWorker, Thread, TimerTask
public interface RunnableThe Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run.
This interface is designed to provide a common protocol for objects that wish to execute code while they are active. For example, Runnable is implemented by class Thread. Being active simply means that a thread has been started and has not yet been stopped.
In addition, Runnable provides the means for a class to be active while not subclassing Thread. A class that implements Runnable can run without subclassing Thread by instantiating a Thread instance and passing itself in as the target. In most cases, the Runnable interface should be used if you are only planning to override the run[] method and no other Thread methods. This is important because classes should not be subclassed unless the programmer intends on modifying or enhancing the fundamental behavior of the class.
Since:JDK1.0See Also:Thread, Callable
Method Summary
MethodsModifier and TypeMethod and Description void run[] When an object implementing interface Runnable is used to create a thread, starting the thread causes the object's run method to be called in that separately executing thread.
Method Detail
run
void run[]When an object implementing interface Runnable is used to create a thread, starting the thread causes the object's run method to be called in that separately executing thread.
The general contract of the method run is that it may take any action whatsoever.
See Also:Thread.run[]
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted
descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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JAVA Threads
Compilation fails with an error at line 5
good
None of these
Compilation succeed but Runtime Exception
null
Compilation fails with an error at line 5
good
None of these
Compilation succeed but Runtime Exception
null
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JAVA Threads Which of the following constructor of class Thread is valid one?
Thread[int priority]
Thread[Runnable threadOb, int priority]
None of these
Thread[String threadName, int priority]
Thread[Runnable threadOb, String threadName]
Thread[int priority]
Thread[Runnable threadOb, int priority]
None of these
Thread[String threadName, int priority]
Thread[Runnable threadOb, String threadName]
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JAVA Threads What is the output for the below code ?public class Test extends Thread{ public static void main[String argv[]]{ Test t = new Test[]; t.run[]; } public void start[]{ for[int i = 0; i < 10; i++]{ System.out.println["Value of i = " + i]; } }}
A run time error indicating that no run method is defined for the Thread class
A compile time error indicating that no run method is defined for the Thread class
Clean compile but no output at runtime
Clean compile and at run time the values 0 to 9 are printed out
None of these
A run time error indicating that no run method is defined for the Thread class
A compile time error indicating that no run method is defined for the Thread class
Clean compile but no output at runtime
Clean compile and at run time the values 0 to 9 are printed out
None of these
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JAVA Threads 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 does not compile because the start[] method is not defined in the Test class.
The program compiles, but it does not run because the start[] method is not defined.
The program compiles, but it does not run because the run[] method is not implemented.
The program compiles and runs fine.
The program does not compile because the start[] method is not defined in the Test class.
The program compiles, but it does not run because the start[] method is not defined.
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JAVA Threads 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"]; }}
"BeginEndRun" is printed.
"BeginRunEnd" is printed.
"BeginEnd" is printed.
An exception is thrown at runtime.
Compilation fails.
"BeginEndRun" is printed.
"BeginRunEnd" is printed.
"BeginEnd" is printed.
An exception is thrown at runtime.
Compilation fails.
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JAVA Threads What notifyAll[] method do?
Wakes up all threads that are waiting on this object's monitor
Wakes up all threads that are not waiting on this object's monitor
Wakes up one threads that are waiting on this object's monitor
None of these
Wakes up all threads that are waiting on this object's monitor
Wakes up all threads that are not waiting on this object's monitor
Wakes up one threads that are waiting on this object's monitor
None of these
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MORE MCQ ON JAVA Threads
What will be the output of program class A implements runnable?
3. What will be the output of the program? Explanation: If a Runnable object is passed to the Thread constructor, then the run method of the Thread class will invoke the run method of the Runnable object. ... Exercise :: Threads - Finding the output..
Which of the following methods will start this thread public class my thread implements runnable?
Java Thread start[] method The start[] method of thread class is used to begin the execution of thread.
How does run [] method in runnable work?
run. When an object implementing interface Runnable is used to create a thread, starting the thread causes the object's run method to be called in that separately executing thread. The general contract of the method run is that it may take any action whatsoever.
Does thread implement runnable?
The Thread class itself implements Runnable with an empty implementation of run[] method. For creating a new thread, create an instance of the class that implements Runnable interface and then pass that instance to Thread[Runnable target] constructor.