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Add java Lessons about Numeric Integer Variables in Java
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‎CodeStart/chap_02_DataTypes/NumericIntegerTypes.java‎

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/*****************************************************************************
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* PROJECT: Java-101 Comprehensive Programming Course
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* MODULE: Introduction to Java Fundamentals
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* LESSON: 1.3.1 - Integer Numeric Data Types
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*
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* AUTHOR: Dr. Saad Laouadi, Ph.D.
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* created: April 2025
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*
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* Copyright © 2025 Dr. Saad Laouadi. All Rights Reserved.
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* See LICENSE file for complete terms.
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*****************************************************************************/
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public class NumericIntegerTypes {
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public static void main(String[] args) {
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displayBanner('=', 50);
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System.out.println(" Integer Numeric Types in Java ");
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displayBanner('=', 50);
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// Integer numeric data types
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byte byteVar = 127; // 8-bit signed integer
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short shortVar = 32767; // 16-bit signed integer
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int intVar = 2147483647; // 32-bit signed integer
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long longVar = 9223372036854775807L; // 64-bit signed integer
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// Print out the integer type values and their ranges
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System.out.println("Integer Numeric Data Types:");
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System.out.println("\nbyte:");
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System.out.println("\tValue: " + byteVar);
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System.out.println("\tSize: 8 bits (1 byte)");
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System.out.println("\tRange: -128 to 127");
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System.out.println("\tUse: Memory-sensitive data, file I/O operations");
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System.out.println("\nshort:");
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System.out.println("\tValue: " + shortVar);
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System.out.println("\tSize: 16 bits (2 bytes)");
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System.out.println("\tRange: -32,768 to 32,767");
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System.out.println("\tUse: Memory conservation when range is sufficient");
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System.out.println("\nint:");
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System.out.println("\tValue: " + intVar);
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System.out.println("\tSize: 32 bits (4 bytes)");
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System.out.println("\tRange: -2,147,483,648 to 2,147,483,647");
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System.out.println("\tUse: Default integer type for most calculations");
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System.out.println("\nlong:");
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System.out.println("\tValue: " + longVar);
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System.out.println("\tSize: 64 bits (8 bytes)");
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System.out.println("\tRange: -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807");
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System.out.println("\tUse: Very large numbers, timestamps, unique IDs");
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System.out.println("\tNote: The 'L' suffix is required for long literals");
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displayBanner('=', 50);
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}
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public static void displayBanner(char c, int length) {
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for (int i = 0; i < length; i++) {
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System.out.print(c);
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}
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System.out.println();
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}
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// Numeric Integer Examples
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public static void numiericIntegerVariablesUsage(){
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// Examples of using integer types
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System.out.println("\nExamples of Integer Operations:");
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int sum = 25 + 50;
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System.out.println("\tAddition: 25 + 50 = " + sum);
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int difference = 100 - 30;
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System.out.println("\tSubtraction: 100 - 30 = " + difference);
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int product = 5 * 6;
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System.out.println("\tMultiplication: 5 * 6 = " + product);
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int quotient = 20 / 4;
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System.out.println("\tDivision: 20 / 4 = " + quotient);
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int remainder = 17 % 5;
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System.out.println("\tRemainder (modulus): 17 % 5 = " + remainder);
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}
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}

‎CodeStart/chap_02_DataTypes/NumericIntegerTypesInfo.java‎

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/*****************************************************************************
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* PROJECT: Java-101 Comprehensive Programming Course
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* MODULE: Introduction to Java Fundamentals
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* LESSON: 1.3.2 - Numeric Integer Data Types
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*
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* AUTHOR: Dr. Saad Laouadi, Ph.D.
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* CREATED: March 2025
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*
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* Copyright © 2025 Dr. Saad Laouadi. All Rights Reserved.
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* See LICENSE file for complete terms.
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*****************************************************************************/
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public class NumericIntegerTypesInfo {
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public static void main (String[] args){
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displayBanner('-', 60);
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System.out.println(" NUMERIC INTEGER VARIABLES ");
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displayBanner('-', 60);
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// Create variables of each integer type
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byte byteVar = 127;
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short shortVar = 32767;
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int intVar = 2147483647;
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long longVar = 9223372036854775807L;
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// Display information about byte
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System.out.println("BYTE:");
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System.out.println("\tSize in memory: " + Byte.BYTES + " bytes (" + (Byte.BYTES * 8) + " bits)");
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System.out.println("\tMinimum value: " + Byte.MIN_VALUE);
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System.out.println("\tMaximum value: " + Byte.MAX_VALUE);
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System.out.println("\tExample value: " + byteVar);
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System.out.println();
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// Display information about short
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System.out.println("SHORT:");
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System.out.println("\tSize in memory: " + Short.BYTES + " bytes (" + (Short.BYTES * 8) + " bits)");
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System.out.println("\tMinimum value: " + Short.MIN_VALUE);
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System.out.println("\tMaximum value: " + Short.MAX_VALUE);
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System.out.println("\tExample value: " + shortVar);
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System.out.println();
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// Display information about int
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System.out.println("INT:");
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System.out.println("\tSize in memory: " + Integer.BYTES + " bytes (" + (Integer.BYTES * 8) + " bits)");
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System.out.println("\tMinimum value: " + Integer.MIN_VALUE);
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System.out.println("\tMaximum value: " + Integer.MAX_VALUE);
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System.out.println("\tExample value: " + intVar);
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System.out.println();
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// Display information about long
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System.out.println("LONG:");
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System.out.println("\tSize in memory: " + Long.BYTES + " bytes (" + (Long.BYTES * 8) + " bits)");
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System.out.println("\tMinimum value: " + Long.MIN_VALUE);
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System.out.println("\tMaximum value: " + Long.MAX_VALUE);
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System.out.println("\tExample value: " + longVar);
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displayBanner('-', 60);
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}
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public static void displayBanner(char c, int length) {
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for (int i = 0; i < length; i++) {
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System.out.print(c);
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}
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System.out.println();
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}
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}

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