Basics of java

Apr 21, 20161 like388 views

Java was created in 1991 at Sun Microsystems by James Gosling and others. It derives its syntax from C and object-oriented features from C++. Java is portable, secure, object-oriented, robust, multithreaded, architecture neutral, distributed, and dynamic. The Java Virtual Machine (JVM) executes Java bytecode, which is platform independent. The Java Development Kit (JDK) includes tools for developing Java programs like the compiler and JRE. The JRE provides the minimum requirements to run Java programs and includes the JVM and core classes. A simple "Hello World" Java program is presented.

History
● Most of the character of Java is inherited from two languages. From
C, Java derives its syntax. Many of Java’s Object - Oriented features
were influenced by C++.
● Java was started as a project by James Gosling, Patrick Naughton,
Chris Warth, Ed Frank and Mike Sheridan at Sun Microsystems, Inc.
in 1991.
● This language was initially called “Oak”, but was renamed as “Java”
in 1995.

Characteristics Of Java
● Portable
● Security
● Object Oriented
● Robust
● Multithreaded
● Architecture Neutral
● Distributed
● Dynamic

JVM (Java Virtual Machine)
Bytecodes are the machine language of the Java virtual machine.
JVM (Java Virtual Machine) is an abstract machine.
It is a specification that provides runtime environment in which java
bytecode can be executed.

JDK (Java Development Kit)
The Java Development Kit (JDK) is a software development
environment used for developing Java applications and applets.
It includes the Java Runtime Environment (JRE), an interpreter/loader
(java), a compiler (javac), an archiver (jar), a documentation generator
(javadoc) and other tools needed in Java development.

JRE (Java Runtime Environment)
The Java Runtime Environment (JRE), also known as Java Runtime, is
part of the Java Development Kit (JDK), a set of programming tools for
developing Java applications.
The Java Runtime Environment provides the minimum requirements for
executing a Java application; it consists of the Java Virtual Machine
(JVM), core classes, and supporting files.

First Hello World Program
HelloWorld.java
public class HelloWorld {
public static void main(String args[]) {
System.out.println(“Hello World Java Program”);
}
}

Compile And Execute
● Set JAVA path and classpath
● Compile
javac HelloWorld.java
java HelloWorld

Java - Decision Making
The if Statement
Syntax :
if(condition)
Statement;
else
Statement;
Example :
if (num < 100)
System.out.println(“Number is less than 100”);
else
System.out.println(“Number is greater than 100”)

Java - Loop Control
The For Loop
for (initialization; condition; iteration)
statement;
Example :
int x;
for (x = 0; x < 10; x = x + 1) {
System.out.println(“Current Value of X: ” + x);
}

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Basics of java

1. Basics Of Java

2. History ● Most of the character of Java is inherited from two languages. From C, Java derives its syntax. Many of Java’s Object - Oriented features were influenced by C++. ● Java was started as a project by James Gosling, Patrick Naughton, Chris Warth, Ed Frank and Mike Sheridan at Sun Microsystems, Inc. in 1991. ● This language was initially called “Oak”, but was renamed as “Java” in 1995.

3. Characteristics Of Java ● Portable ● Security ● Object Oriented ● Robust ● Multithreaded ● Architecture Neutral ● Distributed ● Dynamic

5. JVM (Java Virtual Machine) Bytecodes are the machine language of the Java virtual machine. JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed.

6. JDK (Java Development Kit) The Java Development Kit (JDK) is a software development environment used for developing Java applications and applets. It includes the Java Runtime Environment (JRE), an interpreter/loader (java), a compiler (javac), an archiver (jar), a documentation generator (javadoc) and other tools needed in Java development.

7. JRE (Java Runtime Environment) The Java Runtime Environment (JRE), also known as Java Runtime, is part of the Java Development Kit (JDK), a set of programming tools for developing Java applications. The Java Runtime Environment provides the minimum requirements for executing a Java application; it consists of the Java Virtual Machine (JVM), core classes, and supporting files.

8. First Hello World Program HelloWorld.java public class HelloWorld { public static void main(String args[]) { System.out.println(“Hello World Java Program”); } }

9. Compile And Execute ● Set JAVA path and classpath ● Compile javac HelloWorld.java java HelloWorld

10. Java - Decision Making The if Statement Syntax : if(condition) Statement; else Statement; Example : if (num < 100) System.out.println(“Number is less than 100”); else System.out.println(“Number is greater than 100”)

11. Java - Loop Control The For Loop for (initialization; condition; iteration) statement; Example : int x; for (x = 0; x < 10; x = x + 1) { System.out.println(“Current Value of X: ” + x); }

Basics of java

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