public final void join() The current thread invokes this method on a second thread, causing the current thread to block until the second thread terminates. We have to use join method when a thread wants to wait until some other thread will complete. Current thread will go in waiting state and it will be in … Read more
1. public final void setName(String name) Changes the name of the thread. name – new name for this thread. 2. public final String getName() Returns this thread’s name. Example: ThreadExample.java /** * This program is used to show the thread naming example. * @author w3schools */ class Test extends Thread{ public void run(){ //Thread.currentThread()returns the current thread. System.out.println("Id of … Read more
Thread priority: Thread priority represents a number between 1 to 10. It helps the operating system to determine the order in which threads are scheduled. Static fields for thread priority defined in Thread class: 1. public static final int MIN_PRIORITY The minimum priority that a thread can have. Default value : 1 2. public static final int … Read more
Thread Scheduling: Execution of multiple threads on a single CPU in some order is called thread scheduling. It is done by thread scheduler. Thread scheduler: In which order threads will execute in multithreading environment is determined by thread scheduler. What is the difference between preemptive scheduling and time slicing? In case of preemptive scheduling the … Read more
1. public void start() starts thread to begin execution, JVM calls run method of this thread. IllegalThreadStateException – if the thread was already started. 2. public void run() run method is used to perform operations by thread. 3. public final void setName(String name) Changes the name of the thread. name – new name for this thread. 4. public final String getName() … Read more
Way of creating thread: By implementing Runnable interface. By extending Thread class. Important points: We discussed earlier that every thread has a job associated with it. This job is what we are performing in run method. By default every program have one main thread. It may have number of daemon threads. GC is a daemon … Read more
Thread life cycle: New. Runnable. Running. Blocked(Non-Runnable). Dead. Diagram: 1. New: A new thread is created but not working. A thread after creation and before invocation of start() method will be in new state. 2. Runnable: A thread after invocation of start() method will be in runnable state. A thread in runnable state will … Read more
1. getMessage(): returns the message string about the exception. Syntax: public String getMessage() 2. getCause(): returns the cause of the exception. It will return null if the cause is unknown or non-existent. Syntax: public Throwable getCause() 3. toString(): returns a short description of the exception. Description of the exception = class name + “: “ + message. … Read more
Custom exception: You can define your own exception also. These exceptions are known as custom exceptions. Note: 1. For writing custom-checked exceptions, extend the Exception class. 2. For writing custom unchecked exceptions, extend the RuntimeException class. Java Custom Exception Example class MyException extends Exception { public MyException(String message) { super(message); } } class … Read more
If the superclass method does not declare an exception then the subclass overridden method cannot declare the checked exception but it can declare an unchecked exception. If the superclass method declares an exception then the subclass overridden method can declare the same exception, subclass exception, or no exception but cannot declare the parent exception of … Read more