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Introduction to Java
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  • Course
  • Computer Science I (CSC1016S)
  • Institution
  • University Of Cape Town (UCT)

The notes were taken from all the lectures (including SIPP) since the beginning of the semester. Notes will be regularly updated with time. Notes are concise and easy to read. They are a summation of the key points from the slides and the lecturers.

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Document information

  • August 27, 2023
  • 2
  • 2023/2024
  • Class notes
  • Aslam safla
  • All classes

Subjects

  • coding

Written for

  • University of Cape Town (UCT)
  • Computer Science I (CSC1016S)
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CSC1016S Lecture 02 - 25/07/2023
Topic: Introduction to Java
Course: CSC1016S
Date: 25/07/2023
Professor/Speaker: Aslam Safla

INTRODUCTION TO JAVA
Java is an Object-Oriented Program (OOP)
Created by James Gosling (in 1991)
Released by Sun Microsystems (in 1996)
A type of Interpreted language (executes one line at a time)
Functions are called methods in Java
Java is a compiled language
A regular Java program is a class with the main method
JAVA CODING STEPS: Java code/java byte code/machine language/execute
Java can be considered both a compiled and an interpreted language because
its source code is first compiled into a binary byte-code. This byte-code runs
on the Java Virtual Machine (JVM), which is usually a software-based
interpreter.
Why Java byte code?
Makes Java portable
Allows program to run across various machines
Difference between compiled and interpreted language:
A compiled language is converted into machine code so that the processor
can execute it. An interpreted language is a language in which the
implementations execute instructions directly(line by line) without
earlier compiling a program into machine language. The compiled
programs run faster .th
an interpreted programs.
TYPICAL HELLOWORD PROGRAM
1 public class FirstProgram //class name
2{
3 public static void main ( String [ ] args) //main method
4 {
5 System.out.println("Hello world");
6 //Semi-colons at the end of every statement
7 }

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