Introduction to Core Java Programming
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Java is a programming language designed for use in the distributed environment of the Internet. Programming language developed for the Web. Programming language Developed by James Gosling. Sun Microsystems released java in 1995 as a core component of Sun Java technology. Java is very versatile, efficient, platform independent and secure. Java is write once and run anywhere.
![Get Started
// Writing my first Java Application program
// Your first Java application:
/*
This is a simple Java program
Call this file "Demo.java".
*/
public class Demo {
// Your program begins with a call to main.
public static void main (String args [ ] ) {
System.out.println ( "This is a simple Java program.");
}
}
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![Keyboard Input
// Keyboard Input
import java.util.Scanner;
public class MyScanner {
public static void main(String args[]) {
Scanner ragh = new Scanner(System.in);
System.out.println("Enter the length");
double rlength,rwidth,rarea;
rlength = ragh.nextDouble();
System.out.println("Enter the width");
rwidth = ragh.nextDouble();
rarea= (rlength*rwidth);
System.out.println("Area is ="+rarea);
}
}
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![Keyboard Input
// Keyboard Input
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class KeyboardBufferedInput {
public static void main (String args[]) throws IOException
{ String s1 =null;
String s2=null;
double a;
System.out.print("enter the length:");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
s1=br.readLine();
double l=Integer.parseInt(s1);
System.out.print("enter the breadth:");
s2= br.readLine();
double w=Integer.parseInt(s2);
a=l*w;
System.out.print("area is="+a);
}
}
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Introduction to Core Java Programming
- 1. Introduction to Core Java Programming www.collaborationtech.co.in Bengaluru INDIA Presentation By Ramananda M.S Rao
- 2. Introduction to JavaScript Basics Content Overview Get Started Variables & Declaration Java Statements Java Data Types Control Structures Keyboard Input Regular Expressions Java Exceptions and Logging Files and Serialization Java Utility Objects and API’s Object Oriented Programming Java Collections Java Threads GUI - Awt and Swing Database Connectivity Simple Networking New Features JDK 1.8 Development Tools About Us www.collaborationtech.co.in
- 3. Overview What is Java? Java is a programming language designed for use in the distributed environment of the Internet. Programming language developed for the Web. Programming language Developed by James Gosling. Sun Microsystems released java in 1995 as a core component of Sun Java technology. Java is very versatile, efficient, platform independent and secure. Java is write once and run anywhere. About 2 billion Devices using Java in various applications. Java is used in Embedded devices, Mobile phones, Enterprise Servers, Super computers, Web Servers and Enterprise Appls. These features makes java technology ideal for network computing. www.collaborationtech.co.in
- 4. Get Started Java programs 1. Applications 2. Applets. Application Program : Java applications are more general programs written in the Java language. Java can be used to create all kinds of applications. Applet Program: Applets are Java programs that are downloaded over the World Wide Web and executed by a java enabled Web browser. Applet is an window based program which can be executed inside another application called a browser. Program compiled using javac compiler and converted into an class file Class file name is then included in the applet tag’s code attribute in an html file. Java Applets makes the application more dynamic and interactive. www.collaborationtech.co.in
- 5. Get Started // Writing my first Java Application program // Your first Java application: /* This is a simple Java program Call this file "Demo.java". */ public class Demo { // Your program begins with a call to main. public static void main (String args [ ] ) { System.out.println ( "This is a simple Java program."); } } www.collaborationtech.co.in
- 6. Get Started Writing the Program: In Java the name of the source file should be followed by the .java (dot java) extension. It is a text file that contains one or more class definitions. The Java compiler requires that a source file use the .java filename extension. Compiling the program To compile the example program, execute the compiler, javac, specifying the name of the source file on the command line as, shown below: C:>javac Demo.java The javac compiler creates a file called Demo.class that contains the bytecode version of the program. www.collaborationtech.co.in
- 7. Java Data Types Java Data Types Java is what is known as a strongly typed language. That means that Java is a language that will only accept specific values within specific variables or parameters. Java (strongly typed) 1: int x; // Declare a variable of type int 2: x = 1; // Legal 3: x = "Test" // Compiler Error 4: x = true; // Compiler Error There are 9 data types in Java, 8 primitive types and a reference type www.collaborationtech.co.in
- 8. Java Data Types Java Primitive Types boolean, char, byte, short, int, long, float , double Reference Types Basically, anything that is not a primitive (an int, a float, etc.) is a reference. That means that arrays are references, as are instances of classes. The variable that you create does not have the object you've created in it. Rather, it has a reference to that object in it. 1: // Create a new object and store it in a variable 2: MyClass anInstanceOfMyClass = new MyClass(); Objects and Arrays are reference types Primitive types are stored as values Reference type variables are stored as references (pointers that we can’t mess with) www.collaborationtech.co.in
- 9. Java Data Types Passing arguments to methods Primitive types: the method gets a copy of the value. Changes won’t show up in the caller Pass by value Reference types The method gets a copy of the reference, the method accesses the same object Pass by reference There is no pass by pointers! Casting: Because Java is a strongly typed language, it is sometimes necessary to perform a cast of a variable. Casting is the explicit or implicit modification of a variable's type. Casting allows us to view the data within a given variable as a different type than it was given. Example: 1: short x = 10; 2: int y = (int)x; www.collaborationtech.co.in
- 10. Keyboard Input // Keyboard Input import java.util.Scanner; public class MyScanner { public static void main(String args[]) { Scanner ragh = new Scanner(System.in); System.out.println("Enter the length"); double rlength,rwidth,rarea; rlength = ragh.nextDouble(); System.out.println("Enter the width"); rwidth = ragh.nextDouble(); rarea= (rlength*rwidth); System.out.println("Area is ="+rarea); } } www.collaborationtech.co.in
- 11. Keyboard Input // Keyboard Input import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class KeyboardBufferedInput { public static void main (String args[]) throws IOException { String s1 =null; String s2=null; double a; System.out.print("enter the length:"); BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); s1=br.readLine(); double l=Integer.parseInt(s1); System.out.print("enter the breadth:"); s2= br.readLine(); double w=Integer.parseInt(s2); a=l*w; System.out.print("area is="+a); } } www.collaborationtech.co.in
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