Multithread Programing in Java

Mar 5, 2015Download as pptx, pdf10 likes2,837 views

Multithreading is the ability of a program or an operating system process to manage its use by more than one user at a time and to even manage multiple requests by the same user without having to have multiple copies of the programming running in the computer.

Multithreading
M. Raihan
Computer Science and Engineering Discipline , Khulna University

What is Thread ?
 A thread is similar to a program that has a single flow of control
 A thread has a beginning , a body and an end and executes commands
sequentially.
 Each thread is a statically ordered sequence of
instructions.
 Threads are being extensively used express concurrency on both single and
multiprocessors machines.

What is Multithread?
Multithreading is the ability of a program or an
operating system process to manage its use by
more than one user at a time and to even manage
multiple requests by the same user without
having to have multiple copies of the
programming running in the computer.

Threads Methods
 Java has built in thread support for Multithreading
 Thread Methods :

Thread Declaration
Thread can be declared in two ways :
 Create a class that extends the Thread class
 Create a class that implements the Runnable interface

1st way:
 Create a class by extending Thread class and override
run() method:
class MyThread extends Thread
{
public void run()
{
// thread body of execution
}
}
Create a thread:
MyThread thr1 = new MyThread();
Start Execution of threads:
thr1.start();
Create and Execute:
new MyThread().start();

2nd way:
 Create a class that implements the interface Runnable
and override run() method:
class MyThread implements Runnable
{
.....
public void run()
{
// thread body of execution
}
}
Creating Object:
MyThread myObject = new MyThread();
Creating Thread Object:
Thread thr1 = new Thread( myObject );
Start Execution:
thr1.start();

Synchronization
 Synchronization in java is the capability of control the access of
multiple threads to any shared resource.
 Java Synchronization is better option where we want to allow only one
thread to access the shared resource.
 Why we use :
1. To prevent thread interference.
2. To prevent consistency problem.

Example
class Table{
synchronized void printTable(int n){//synchronized method
for(int i=1;i<=5;i++){
System.out.println(n*i);
try{
Thread.sleep(400);
}catch(Exception e){System.out.println(e);}
}
}
}

Example (Continue)
class MyThread1 extends Thread{
Table t;
MyThread1(Table t){
this.t=t;
}
public void run(){
t.printTable(2);
}
}
class MyThread2 extends Thread{
Table t;
MyThread2(Table t){
this.t=t;
}
public void run(){
t.printTable(100);
}
}

Example (Continue)
public class TestSynchronization{
public static void main(String args[]){
Table obj = new Table();//only one object
MyThread1 t1=new MyThread1(obj);
MyThread2 t2=new MyThread2(obj);
t1.start();
t2.start();
}
}

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This document discusses various data representation techniques including excess-3 code, Gray code, binary coded decimal, ASCII, EBCDIC, Unicode, and logic gates. Excess-3 code represents each decimal number as a binary number in excess of three. Gray code ensures each code differs from its neighbor by one bit. ASCII and EBCDIC are character encoding standards that allow representation of text. Unicode supports encoding for many languages. The document also describes logic gates like AND, OR, NOT, XOR, and how logic expressions can be represented using gates.

Lecture 8M. Raihan

A bit is the smallest unit of data that can represent either a 1 or 0. Eight bits form a byte, which can represent one character. Common units for data storage are bytes, kilobytes, megabytes and gigabytes. There are different number systems used to represent numeric values in computing, including binary, octal and hexadecimal. Binary numbers can be added, subtracted and multiplied using logic gates. Decimal numbers can be converted to their binary or octal equivalent through repeated division and obtaining remainders.

Lecture 7M. Raihan

The document discusses different ways of representing numeric data in computing systems. It covers external representation using symbols like letters and numbers, and internal representation using binary digits (0s and 1s). Numeric data is categorized as integer or real numbers, and further as signed or unsigned values. Different number systems like binary, octal, decimal, and hexadecimal are explained, along with how values are represented and converted between these systems using place value and arithmetic operations on the base of each system. Conversion examples are provided between decimal, binary, octal, and hexadecimal numbers.

Lecture 6M. Raihan

There are two types of LCD screens: passive-matrix and active-matrix. Passive matrix LCD screens arrange elements in rows and columns and activate them sequentially, which can cause ghosting. Active matrix LCD screens use transistors to independently control each element, allowing for higher quality images. Printers also come in impact and non-impact varieties. Impact printers like dot matrix printers work by striking pins against an inked ribbon. Non-impact printers like inkjet and laser printers work without physical contact by spraying or fusing tiny droplets of ink. Laser printers create electrostatic images on a drum using a laser beam.

Lecture 5M. Raihan

The document discusses different types of computer output devices. It describes monitors, printers, 3D printers, braille readers, GPS devices, plotters, headphones, projectors, sound cards, video cards, and different types of displays including CRT displays and LCD monitors. It provides details on what each device is and how it functions, as well as advantages and disadvantages of CRT and LCD displays.

Lecture 4M. Raihan

The document discusses various input devices used in computers. It describes keyboards, mice, joysticks, light pens, trackballs, scanners, graphics tablets, microphones, magnetic ink card readers, optical character readers, optical mark readers, bar code readers, and webcams. For each device, it provides details on what it is and how it functions to input data into a computer. The keyboard section contains the most detail, breaking down its different types of keys and their purposes.

Lecture 18M. Raihan

An information system is a group of components that collect, organize, store, and communicate information to help organizations operate, manage their resources, and compete in the marketplace. There are different types of information systems that support various organizational levels, including transaction processing systems, office automation systems, knowledge work systems, management information systems, decision support systems, and executive support systems. The systems development life cycle is the process used to plan, create, test, and deploy information systems and includes steps like system planning, analysis, design, implementation, testing, and maintenance.

Lecture 17M. Raihan

The document discusses various topics related to online work and e-commerce. It begins by describing different types of internet connections like dial-up, DSL, cable, satellite, and mobile. It then discusses the hardware needed like modems and routers. It provides definitions and examples of different types of e-commerce like B2B, B2C, C2C, C2B, B2A, and C2A. The advantages of e-commerce are described as reaching a global market, shortening distribution chains, increased productivity and competitiveness for businesses, and cost reduction. The disadvantages are strong dependence on technology, lack of adequate legislation, consumer reluctance, privacy and identity issues, and security concerns.

Lecture 16M. Raihan

Bitmap images store color information for each individual pixel arranged in a pattern, while vector images use mathematical formulas to draw lines and curves. Bitmaps can be edited by changing pixel colors, while vectors are edited by manipulating lines and curves. Vector images tend to be smaller files since they just store formulas rather than individual pixel data. Graphics software allows users to manipulate images on a computer and can be categorized as raster or vector based. Common software includes paint programs for photo editing, draw programs, and CAD for design. Word processors, publishing software, illustration programs, and presentation software allow combining text and graphics. Clip art contains images that can be imported, while multimedia integrates various media types into an interactive experience.

Lecture 3M. Raihan

The document provides an overview of the internet and its key components. It discusses how the internet originated from the ARPANET project in 1968 and evolved to become a global system of interconnected computer networks using TCP/IP. The key elements that enable the internet are described, including protocols like TCP and IP, packets, routers, domain names, HTML, email and the World Wide Web. Common internet services like file transfer, communication tools, information retrieval and e-commerce are also summarized. Connection types, firewalls and other networking concepts are briefly covered as well.

Lecture 7M. Raihan

Lecture 6M. Raihan

Lecture 5M. Raihan

Lecture 4M. Raihan

Lecture 3M. Raihan

Lecture 2M. Raihan

Lecture 1M. Raihan

Amplifiers and biopotential amplifiers newM. Raihan

Comparison of fnir with other neuroimaging modalities relation between eeg sy...M. Raihan

Lecture 10M. Raihan

Lecture 9M. Raihan

Lecture 8M. Raihan

Lecture 7M. Raihan

Lecture 6M. Raihan

Lecture 5M. Raihan

Lecture 4M. Raihan

Lecture 18M. Raihan

Lecture 17M. Raihan

Lecture 16M. Raihan

Lecture 3M. Raihan

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Multithread Programing in Java

1. Multithreading M. Raihan Computer Science and Engineering Discipline , Khulna University

2. What is Thread ?  A thread is similar to a program that has a single flow of control  A thread has a beginning , a body and an end and executes commands sequentially.  Each thread is a statically ordered sequence of instructions.  Threads are being extensively used express concurrency on both single and multiprocessors machines.

3. What is Multithread? Multithreading is the ability of a program or an operating system process to manage its use by more than one user at a time and to even manage multiple requests by the same user without having to have multiple copies of the programming running in the computer.

4. A Single Thread

5. A Multithread Program

6. Threads Methods  Java has built in thread support for Multithreading  Thread Methods :

7. Thread Declaration Thread can be declared in two ways :  Create a class that extends the Thread class  Create a class that implements the Runnable interface

8. 1st way:  Create a class by extending Thread class and override run() method: class MyThread extends Thread { public void run() { // thread body of execution } } Create a thread: MyThread thr1 = new MyThread(); Start Execution of threads: thr1.start(); Create and Execute: new MyThread().start();

9. 2nd way:  Create a class that implements the interface Runnable and override run() method: class MyThread implements Runnable { ..... public void run() { // thread body of execution } } Creating Object: MyThread myObject = new MyThread(); Creating Thread Object: Thread thr1 = new Thread( myObject ); Start Execution: thr1.start();

10. Life Circle

11. Synchronization  Synchronization in java is the capability of control the access of multiple threads to any shared resource.  Java Synchronization is better option where we want to allow only one thread to access the shared resource.  Why we use : 1. To prevent thread interference. 2. To prevent consistency problem.

12. Synchronization  Synchronization in java is the capability of control the access of multiple threads to any shared resource.  Java Synchronization is better option where we want to allow only one thread to access the shared resource.  Why we use : 1. To prevent thread interference. 2. To prevent consistency problem. Synchronized method is used to lock an object for any shared resource.

13. Example class Table{ synchronized void printTable(int n){//synchronized method for(int i=1;i<=5;i++){ System.out.println(n*i); try{ Thread.sleep(400); }catch(Exception e){System.out.println(e);} } } }

14. Example (Continue) class MyThread1 extends Thread{ Table t; MyThread1(Table t){ this.t=t; } public void run(){ t.printTable(2); } } class MyThread2 extends Thread{ Table t; MyThread2(Table t){ this.t=t; } public void run(){ t.printTable(100); } }

15. Example (Continue) public class TestSynchronization{ public static void main(String args[]){ Table obj = new Table();//only one object MyThread1 t1=new MyThread1(obj); MyThread2 t2=new MyThread2(obj); t1.start(); t2.start(); } }

16. Thank You

Multithread Programing in Java

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