What is thread class in java?

Answer 1

The ability of a program to concurrently execute multiple regions of code provides capabilities that are difficult or impossible to achieve with strictly sequential languages. Sequential object-oriented languages send messages (make method calls) and then block or wait for the operation to complete.

Programmers are already familiar with concurrent processes, possibly without

recognizing them. For example, operating systems usually have many processes

running to handle printing, updating the display, receiving mail from the network, and so on. In contrast, most programming languages do not promote the use of concurrent operations within one application. At best, programmers have access to a few library calls to launch and control multiple operations.

Java provides language-level and library support for threads--independent

sequences of execution within the same program that share the same code and data address space. Each thread has its own stack to make method calls and store local variables.

Most applications that use threads are a form of simulation or have a graphical

user interface, but threads in general have the following advantages over sequential programming:

Threads support concurrent operations.

For example, Server applications can handle multiple clients by launching a thread to deal with each client.

Long computations or high-latency disk and network operations can be handled in the background without disturbing foreground computations or screen updates.

Threads often result in simpler programs.

In sequential programming, updating multiple displays normally requires a big

while-loop that performs small parts of each display update. Unfortunately,

this loop basically simulates an operating system scheduler. In Java, each view

can be assigned a thread to provide continuous updates.

Programs that need to respond to user-initiated events can set up service

routines to handle the events without having to insert code in the main routine

to look for these events.

Threads provide a high degree of control.

Imagine launching a complex computation that occasionally takes longer than

is satisfactory. A "watchdog" thread can be activated that will "kill" the

computation if it becomes costly, perhaps in favor of an alternate,

approximate solution. Note that sequential programs must muddy the

computation with termination code, whereas, a Java program can use thread

control to non-intrusively supervise any operation.

Threaded applications exploit parallelism.

A computer with multiple CPUs can literally execute multiple threads on

different functional units without having to simulating multi-tasking ("time

sharing").

On some computers, one CPU handles the display while another handles

computations or database accesses, thus, providing extremely fast user

interface response times.

Answer 2

Thread can be considered as a program in execution. Java gives us the facility to create a thread from within another java program. You can create a thread two ways:

1. Extending the Thread Class. Ex:

Public class ThreadTest extends Thread {

Answer 3

the Thread class is used to create Threads in Java. you can create a thread by extending the thread class.

Ex:

public class A extends Thread {

...

public void run(){

}

...

}

Answer 4

Thread can be considered as a program in execution. Java gives us the facility to create a thread from within another java program. You can create a thread two ways:

1. Extending the Thread Class. Ex:

Public class ThreadTest extends Thread {…}

2. Implementing the Runnable Interface. Ex:

Public class ThreadTest implements Runnable {…}

In both these classes, we must write the logic that must be executed as a separate thread inside the run() method and this would be invoked using the Thread.start() method