that's introduced for Students at Al-Azhar university Faculty of Engineering .
it talk about :
- what is programming .
- Java ?
- Data types .
- Operations .
- if condition
- loops
for any inquiries don't be hesitate to Contact me.
At first glance, writing concurrent programs in Java seems like a straight-forward task. But the devil is in the detail. Fortunately, these details are strictly regulated by the Java memory model which, roughly speaking, decides what values a program can observe for a field at any given time. Without respecting the memory model, a Java program might behave erratic and yield bugs that only occure on some hardware platforms. This presentation summarizes the guarantees that are given by Java's memory model and teaches how to properly use volatile and final fields or synchronized code blocks. Instead of discussing the model in terms of memory model formalisms, this presentation builds on easy-to follow Java code examples.
Java agents and their instrumentation API offer developers the most powerful toolset to interact with a Java application. Using this API, it becomes possible to alter the code of running applications, for example to add monitoring or to inject security checks as it is done by many enterprise products for the Java ecosystem.
In this session, developers will learn how to program Java agents of their own that make use of the instrumentation API. Doing so, developers learn how the majority of tooling for the JVM is implemented and will learn about Byte Buddy, a high level code generation library that does not require any knowledge of Java byte code that is normally required for writing agents. In the process, developers will see how Java classes can be used as templates for implementing highly performant code changes that avoid the boilerplate of alternative solutions such as AspectJ or Javassist while still performing better than agents implemented in low-level libraries such as ASM.
Java is Object Oriented Programming. Java 8 is the latest version of the Java which is used by many companies for the development in many areas. Mobile, Web, Standalone applications.
that's introduced for Students at Al-Azhar university Faculty of Engineering .
it talk about :
- what is programming .
- Java ?
- Data types .
- Operations .
- if condition
- loops
for any inquiries don't be hesitate to Contact me.
At first glance, writing concurrent programs in Java seems like a straight-forward task. But the devil is in the detail. Fortunately, these details are strictly regulated by the Java memory model which, roughly speaking, decides what values a program can observe for a field at any given time. Without respecting the memory model, a Java program might behave erratic and yield bugs that only occure on some hardware platforms. This presentation summarizes the guarantees that are given by Java's memory model and teaches how to properly use volatile and final fields or synchronized code blocks. Instead of discussing the model in terms of memory model formalisms, this presentation builds on easy-to follow Java code examples.
Java agents and their instrumentation API offer developers the most powerful toolset to interact with a Java application. Using this API, it becomes possible to alter the code of running applications, for example to add monitoring or to inject security checks as it is done by many enterprise products for the Java ecosystem.
In this session, developers will learn how to program Java agents of their own that make use of the instrumentation API. Doing so, developers learn how the majority of tooling for the JVM is implemented and will learn about Byte Buddy, a high level code generation library that does not require any knowledge of Java byte code that is normally required for writing agents. In the process, developers will see how Java classes can be used as templates for implementing highly performant code changes that avoid the boilerplate of alternative solutions such as AspectJ or Javassist while still performing better than agents implemented in low-level libraries such as ASM.
Java is Object Oriented Programming. Java 8 is the latest version of the Java which is used by many companies for the development in many areas. Mobile, Web, Standalone applications.
This has been presented in association with Robosepians for Java concepts. Basic concepts of Java including features, conditional statements, loop statements, arrays, string, primitive datatypes, essentials of Java including oops concepts, classes, objects, polymorphism, advance topics including packages, exception handling, multihtreading and network programming have been discussed.
The original Creative JavaScript tutorial, covering loops in JavaScript. This tutorial is aimed at creative people with no programming experience who are interested to learn loops JavaScript.
Synapse India Reviews About:
Functional/procedural programming:
program is a list of instructions to the computer
Object-oriented programming
program is composed of a collection objects that communicate with each other
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2. Java - General
Java is:
– platform independent programming
language
– similar to C++ in syntax
– similar to Smalltalk in mental paradigm
Pros: also ubiquitous to net
Cons: interpreted, and still under
development (moving target)
3. Java - General
Java has some interesting features:
– automatic type checking,
– automatic garbage collection,
– simplifies pointers; no directly accessible
pointer to memory,
– simplified network access,
– multi-threading!
4. Compile-time EnvironmentCompile-time Environment
Java
Bytecodes
move locally
or through
network
Java
Source
(.java)
Java
Compiler
Java
Bytecode
(.class )
Java
Interpreter
Just in
Time
Compiler
Runtime System
Class
Loader
Bytecode
Verifier
Java
Class
Libraries
Operating System
Hardware
Java
Virtual
machine
How it works…!
5. How it works…!
Java is independent only for one reason:
– Only depends on the Java Virtual Machine
(JVM),
– code is compiled to bytecode, which is
interpreted by the resident JVM,
– JIT (just in time) compilers attempt to
increase speed.
6. Java - Security
Pointer denial - reduces chances of
virulent programs corrupting host,
Applets even more restricted -
– May not
• run local executables,
• Read or write to local file system,
• Communicate with any server other than the
originating server.
7. Object-Oriented
Java supports OOD
– Polymorphism
– Inheritance
– Encapsulation
Java programs contain nothing but
definitions and instantiations of classes
– Everything is encapsulated in a class!
8. Java Advantages
Portable - Write Once, Run Anywhere
Security has been well thought through
Robust memory management
Designed for network programming
Multi-threaded (multiple simultaneous tasks)
Dynamic & extensible (loads of libraries)
– Classes stored in separate files
– Loaded only when needed
10. Primitive Types and Variables
boolean, char, byte, short, int, long, float, double etc.
These basic (or primitive) types are the only types
that are not objects (due to performance issues).
This means that you don’t use the new operator to
create a primitive variable.
Declaring primitive variables:
float initVal;
int retVal, index = 2;
double gamma = 1.2, brightness
boolean valueOk = false;
11. Initialisation
If no value is assigned prior to use, then the
compiler will give an error
Java sets primitive variables to zero or false
in the case of a boolean variable
All object references are initially set to null
An array of anything is an object
– Set to null on declaration
– Elements to zero false or null on creation
12. Declarations
int index = 1.2; // compiler error
boolean retOk = 1; // compiler error
double fiveFourths = 5 / 4; // no error!
float ratio = 5.8f; // correct
double fiveFourths = 5.0 / 4.0; // correct
1.2f is a float value accurate to 7 decimal places.
1.2 is a double value accurate to 15 decimal places.
13. All Java assignments are right associative
int a = 1, b = 2, c = 5
a = b = c
System.out.print(
“a= “ + a + “b= “ + b + “c= “ + c)
What is the value of a, b & c
Done right to left: a = (b = c);
Assignment
14. Basic Mathematical Operators
* / % + - are the mathematical operators
* / % have a higher precedence than + or -
double myVal = a + b % d – c * d / b;
Is the same as:
double myVal = (a + (b % d)) –
((c * d) / b);
15. Statements & Blocks
A simple statement is a command terminated by
a semi-colon:
name = “Fred”;
A block is a compound statement enclosed in
curly brackets:
{
name1 = “Fred”; name2 = “Bill”;
}
Blocks may contain other blocks
16. Flow of Control
Java executes one statement after the other
in the order they are written
Many Java statements are flow control
statements:
Alternation: if, if else, switch
Looping: for, while, do while
Escapes: break, continue, return
17. If – The Conditional Statement
The if statement evaluates an expression and if that
evaluation is true then the specified action is taken
if ( x < 10 ) x = 10;
If the value of x is less than 10, make x equal to 10
It could have been written:
if ( x < 10 )
x = 10;
Or, alternatively:
if ( x < 10 ) { x = 10; }
18. Relational Operators
== Equal (careful)
!= Not equal
>= Greater than or equal
<= Less than or equal
> Greater than
< Less than
19. If… else
The if … else statement evaluates an expression and
performs one action if that evaluation is true or a
different action if it is false.
if (x != oldx) {
System.out.print(“x was changed”);
}
else {
System.out.print(“x is unchanged”);
}
20. Nested if … else
if ( myVal > 100 ) {
if ( remainderOn == true) {
myVal = mVal % 100;
}
else {
myVal = myVal / 100.0;
}
}
else
{
System.out.print(“myVal is in range”);
}
21. else if
Useful for choosing between alternatives:
if ( n == 1 ) {
// execute code block #1
}
else if ( j == 2 ) {
// execute code block #2
}
else {
// if all previous tests have failed,
execute code block #3
}
22. A Warning…
WRONG!
if( i == j )
if ( j == k )
System.out.print(
“i equals k”);
else
System.out.print(
“i is not equal
to j”);
CORRECT!
if( i == j ) {
if ( j == k )
System.out.print(
“i equals k”);
}
else
System.out.print(“
i is not equal to
j”); // Correct!
23. The switch Statement
switch ( n ) {
case 1:
// execute code block #1
break;
case 2:
// execute code block #2
break;
default:
// if all previous tests fail then
//execute code block #4
break;
}
24. The for loop
Loop n times
for ( i = 0; i < n; n++ ) {
// this code body will execute n times
// ifrom 0 to n-1
}
Nested for:
for ( j = 0; j < 10; j++ ) {
for ( i = 0; i < 20; i++ ){
// this code body will execute 200 times
}
}
25. while loops
while(response == 1) {
System.out.print( “ID =” +
userID[n]);
n++;
response = readInt( “Enter “);
}
What is the minimum number of times the loop
is executed?
What is the maximum number of times?
26. do {… } while loops
do {
System.out.print( “ID =” + userID[n] );
n++;
response = readInt( “Enter ” );
}while (response == 1);
What is the minimum number of times the loop
is executed?
What is the maximum number of times?
27. Break
A break statement causes an exit from the
innermost containing while, do, for or
switch statement.
for ( int i = 0; i < maxID, i++ ) {
if ( userID[i] == targetID ) {
index = i;
break;
}
} // program jumps here after break
28. Continue
Can only be used with while, do or for.
The continue statement causes the innermost loop to
start the next iteration immediately
for ( int i = 0; i < maxID; i++ ) {
if ( userID[i] != -1 ) continue;
System.out.print( “UserID ” + i + “ :” +
userID);
}
29. Arrays
Am array is a list of similar things
An array has a fixed:
– name
– type
– length
These must be declared when the array is created.
Arrays sizes cannot be changed during the execution
of the code
30. myArray has room for 8 elements
the elements are accessed by their index
in Java, array indices start at 0
3 6 3 1 6 3 4 1myArray =
0 1 2 3 4 5 6 7
31. Declaring Arrays
int myArray[];
declares myArray to be an array of integers
myArray = new int[8];
sets up 8 integer-sized spaces in memory,
labelled myArray[0] to myArray[7]
int myArray[] = new int[8];
combines the two statements in one line
32. Assigning Values
refer to the array elements by index to store values in
them.
myArray[0] = 3;
myArray[1] = 6;
myArray[2] = 3; ...
can create and initialise in one step:
int myArray[] = {3, 6, 3, 1, 6, 3, 4, 1};
33. Iterating Through Arrays
for loops are useful when dealing with arrays:
for (int i = 0; i <
myArray.length; i++) {
myArray[i] = getsomevalue();
}
34. Arrays of Objects
So far we have looked at an array of primitive types.
– integers
– could also use doubles, floats, characters…
Often want to have an array of objects
– Students, Books, Loans ……
Need to follow 3 steps.
35. Declaring the Array
1. Declare the array
private Student studentList[];
– this declares studentList
2 .Create the array
studentList = new Student[10];
– this sets up 10 spaces in memory that can
hold references to Student objects
3. Create Student objects and add them to the
array: studentList[0] = new
Student("Cathy", "Computing");
37. Classes ARE Object Definitions
OOP - object oriented programming
code built from objects
Java these are called classes
Each class definition is coded in a
separate .java file
Name of the object must match the
class/object name
38. The three principles of OOP
Encapsulation
– Objects hide their
functions (methods) and
data (instance
variables)
Inheritance
– Each subclass inherits
all variables of its
superclass
Polymorphism
– Interface same despite
different data types
car
auto-
matic
manual
Super class
Subclasses
draw() draw()
39. Simple Class and Method
Class Fruit{
int grams;
int cals_per_gram;
int total_calories() {
return(grams*cals_per_gram);
}
}
40. Methods
A method is a named sequence of code that can be
invoked by other Java code.
A method takes some parameters, performs some
computations and then optionally returns a value (or
object).
Methods can be used as part of an expression
statement.
public float convertCelsius(float tempC) {
return( ((tempC * 9.0f) / 5.0f) + 32.0 );
}
41. Method Signatures
A method signature specifies:
– The name of the method.
– The type and name of each parameter.
– The type of the value (or object) returned by the method.
– The checked exceptions thrown by the method.
– Various method modifiers.
– modifiers type name ( parameter list ) [throws exceptions ]
public float convertCelsius (float tCelsius ) {}
public boolean setUserInfo ( int i, int j, String name ) throws
IndexOutOfBoundsException {}
42. Public/private
Methods/data may be declared public or
private meaning they may or may not be
accessed by code in other classes …
Good practice:
– keep data private
– keep most methods private
well-defined interface between classes -
helps to eliminate errors
43. Using objects
Here, code in one class creates an instance
of another class and does something with it
…
Fruit plum=new Fruit();
int cals;
cals = plum.total_calories();
Dot operator allows you to access (public)
data/methods inside Fruit class
44. Constructors
The line
plum = new Fruit();
invokes a constructor method with which you
can set the initial data of an object
You may choose several different type of
constructor with different argument lists
eg Fruit(), Fruit(a) ...
45. Overloading
Can have several versions of a method
in class with different types/numbers of
arguments
Fruit() {grams=50;}
Fruit(a,b) { grams=a; cals_per_gram=b;}
By looking at arguments Java decides
which version to use
46. Java Development Kit
javac - The Java Compiler
java - The Java Interpreter
jdb - The Java Debugger
appletviewer -Tool to run the applets
javap - to print the Java bytecodes
javaprof - Java profiler
javadoc - documentation generator
javah - creates C header files
48. 48
Streams and I/O
basic classes for file IO
– FileInputStream, for reading from a file
– FileOutputStream, for writing to a file
Example:
Open a file "myfile.txt" for reading
FileInputStream fis = new FileInputStream("myfile.txt");
Open a file "outfile.txt" for writing
FileOutputStream fos = new FileOutputStream ("myfile.txt");
49. 49
Display File Contents
import java.io.*;
public class FileToOut1 {
public static void main(String args[]) {
try {
FileInputStream infile = new FileInputStream("testfile.txt");
byte buffer[] = new byte[50];
int nBytesRead;
do {
nBytesRead = infile.read(buffer);
System.out.write(buffer, 0, nBytesRead);
} while (nBytesRead == buffer.length);
}
catch (FileNotFoundException e) {
System.err.println("File not found");
}
catch (IOException e) { System.err.println("Read failed"); }
}
}
50. 50
Filters
•Once a stream (e.g., file) has been opened, we
can attach filters
•Filters make reading/writing more efficient
•Most popular filters:
• For basic types:
•DataInputStream, DataOutputStream
• For objects:
•ObjectInputStream, ObjectOutputStream
51. 51
Writing data to a file using Filters
import java.io.*;
public class GenerateData {
public static void main(String args[]) {
try {
FileOutputStream fos = new FileOutputStream("stuff.dat");
DataOutputStream dos = new DataOutputStream(fos);
dos.writeInt(2);
dos.writeDouble(2.7182818284590451);
dos.writeDouble(3.1415926535);
dos.close(); fos.close();
}
catch (FileNotFoundException e) {
System.err.println("File not found");
}
catch (IOException e) {
System.err.println("Read or write failed");
}
}
}
52. 52
Reading data from a file using filters
import java.io.*;
public class ReadData {
public static void main(String args[]) {
try {
FileInputStream fis = new FileInputStream("stuff.dat");
DataInputStream dis = new DataInputStream(fis);
int n = dis.readInt();
System.out.println(n);
for( int i = 0; i < n; i++ ) { System.out.println(dis.readDouble());
}
dis.close(); fis.close();
}
catch (FileNotFoundException e) {
System.err.println("File not found");
}
catch (IOException e) { System.err.println("Read or write failed");
}
}
}
53. 53
Object serialization
Write objects to a file, instead of writing primitive
types.
Use the ObjectInputStream, ObjectOutputStream
classes, the same way that filters are used.
54. 54
Write an object to a file
import java.io.*;
import java.util.*;
public class WriteDate {
public WriteDate () {
Date d = new Date();
try {
FileOutputStream f = new FileOutputStream("date.ser");
ObjectOutputStream s = new ObjectOutputStream (f);
s.writeObject (d);
s.close ();
}
catch (IOException e) { e.printStackTrace(); }
public static void main (String args[]) {
new WriteDate ();
}
}
55. 55
Read an object from a file
import java.util.*;
public class ReadDate {
public ReadDate () {
Date d = null;
ObjectInputStream s = null;
try { FileInputStream f = new FileInputStream ("date.ser");
s = new ObjectInputStream (f);
} catch (IOException e) { e.printStackTrace(); }
try { d = (Date)s.readObject (); }
catch (ClassNotFoundException e) { e.printStackTrace(); }
catch (InvalidClassException e) { e.printStackTrace(); }
catch (StreamCorruptedException e) { e.printStackTrace(); }
catch (OptionalDataException e) { e.printStackTrace(); }
catch (IOException e) { e.printStackTrace(); }
System.out.println ("Date serialized at: "+ d);
}
public static void main (String args[]) { new ReadDate (); }
}