S : Single Task Responsibility : Each class does only one task well O : Open/Close : Open for extension, closed for change L : Liskov substitution principle : if a method can take a class as a parameter then it must be able to work by taking other subclasses of that class I : … Continued
Temperature and Humidity Controller for Egg hatching
http://arduino-info.wikispaces.com/LCD-Blue-I2C /* YourDuino.com Example Software Sketch 16 character 2 line I2C Display Backpack Interface labelled “A0 A1 A2” at lower right. ..and Backpack Interface labelled “YwRobot Arduino LCM1602 IIC V1” MOST use address 0x27, a FEW use 0x3F terry@yourduino.com */ /*—–( Import needed libraries )—–*/ #include <Wire.h> // Comes with Arduino IDE #include <LCD.h> #include … Continued
Revisiting Datastructures : Implementing Basic Binary Tree in Java
package ds; public class BasicBinaryTree<X extends Comparable<X>> { private Node root; private int size; public BasicBinaryTree(){ this.root = null; } public int size(){ return size; } public void add(X item){ … Continued
Datastructures revisited : Implementing Basic Linked List in Java
public class BasicLinkedList<X> { private Node first; private Node last; private int nodeCount ; public BasicLinkedList(){ first = null; last = null; nodeCount = 0; } public void add(X item){ … Continued
Sending my name to Mars!
Mars Boarding Pass! Ok this generated iframe from nasa is broken but here’s an screenshot :
Datastructures Revisited: Implementing Stack in JAVA
This is the stack implementation in JAVA package ds; public class BasicStack<X> { private X[] data; private int stackPointer; public BasicStack(){ data = (X[]) new Object[1000]; stackPointer = 0; } public void push(X item){ … Continued
Learning Kotlin : Basics & Functional Programming
Here are some Kotlin basics that I have tried. It might be useful as a quick reference: var age = 24 // Explicitely Defined Type var age: Int = 24 ==========IMMUTABLE VARIABLES ======== // can be null ..but not quite this way val str: String = null // ? defines safe checking val str: String? … Continued
Creating a tableLayout dynamically in Android
Creating layouts using xml is easy. But creating layouts in runtime is the only option sometimes… TableLayout tableLayout = (TableLayout) findViewById(R.id.layoutTable); LinearLayout.LayoutParams tableRowParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); /* create a … Continued
Java synchronized keyword : fixing Race condition
In a multithreaded Java program read and write operation from different thread at the same time creates race condition. The simple example here gives different output at different times: public class RaceCondition { public static void main(String[] args) throws InterruptedException{ final LongWrapper longWrapper = new LongWrapper(0L); … Continued
UML Quick Reference Guide
Allen Holub’s very useful and concise UML Reference Allen Holub’s UML Quick Reference