ajjain

package learn.scala

/**
 * This tutorial represents how subsitution principle works in Scala.
 */
object SubsitutionPrincipleNClasses {
  println("Welcome to the Scala worksheet")       //> Welcome to the Scala worksheet
  
  class Rational(x: Int, y: Int){
  	def numer = x;

ajjain

import java.util.Arrays;

import org.activiti.engine.impl.persistence.entity.VariableInstanceEntity;
import org.activiti.engine.impl.variable.DeserializedObject;

public class JsonizedObject extends DeserializedObject {
	Object deserializedObject;
	byte[] originalBytes;
	VariableInstanceEntity variableInstanceEntity;

ajjain

import org.activiti.engine.ActivitiException;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.persistence.entity.VariableInstanceEntity;
import org.activiti.engine.impl.variable.ByteArrayType;
import org.activiti.engine.impl.variable.ValueFields;
import org.codehaus.jackson.map.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**

ajjain

/**
 * @author ajjain
 * 
 *         Markup interface which represents a process variable can be persisted
 *         in Activiti's hydration database as JSON.
 * 
 */
public interface JsonType {

}

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package learn.scala.polymorphism

trait List[T] {
	def isEmpty: Boolean
	def head: T
	def tail: List[T]
}

class Nil[T] extends List[T] {
  def isEmpty: Boolean = true 

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CREATE TABLE BOOK (
  ID SERIAL PRIMARY KEY, 
  NAME VARCHAR (50) UNIQUE NOT NULL, 
  TITLE VARCHAR (100), 
  DESCRIPTION VARCHAR (200)
);

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public class BizService {
  private SqlSessionFactory sqlSessionFactory;
  /**
	 * Initalize the 
	 *
	 * @param config the config
	 */
	private void init(QueryEngineConfiguration config) {
		InputStream inputStream;

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# C stands for CONCAT and helps in creating vector
x <- c(1,2,3)
y1 <- c(T, F, T, F)
y2 <- c(TRUE, FALSE)

# sequence of numbers
z <- 1:100

# complex numbers
a <- c(1+2i, 3+4i)

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# factor for categorical data can be ordered or unordered
# eg. gender (M, F), size (S, M, L, XL, XXL)
# (M, F) or (S, M, L, XL, XXL) are called levels

x <- factor(c("S", "M", "L", "XL", "XXL", "S", "XL", "XXL"))

# represent the class of x which is factor
class(x)

# strips out the class and shows the factors represents as integer

ajjain

x <- c(1,2,NA,3)
is.na(x)
is.nan(x)

y <- c(1,2,NaN,3)
is.na(y)
is.nan(y)

z <- c(1,2,NaN,NA)
is.na(z)