Hi im getting a Exception in thread \"main\" java.lang.NullPointerException. Wha

Question

Hi im getting a Exception in thread "main" java.lang.NullPointerException. What is wrong?

Here is my code.

class MicrosoftMonarchs

{

//declaring all the arrays

public String array[];

public double close[];

public int volume[];

public double open[];

public double high[];

public double low[];

//declaring both size and totalFileData

public long totalFileData=0;

public int size=5;

//main file

public static void main(String[] args)

{

MicrosoftMonarchs data = new MicrosoftMonarchs();

//setting all the arrays equal to the size of the given text

data.array= new String[data.size];

data.close= new double[data.size];

data.volume= new int[data.size];

data.open= new double[data.size];

data.high= new double[data.size];

data.low= new double[data.size];

//read in the text file

data.readTextFile(data);

//print the data from the text file

data.printData(data);

//analyze the data from the text file

data.analyzeData(data);

}

//implementation of the read in from text file

public void readTextFile(MicrosoftMonarchs objdata)

{

//create data member i and set it to zero

int i=0;

BufferedReader reader;

//a try and catch block

try

{

//reading in the text file

reader = new BufferedReader(new FileReader("MicrosoftStockData.txt"));

String first=reader.readLine();

//while loop

while(first!=null)

{

//reading in the first line with commas in between each piece of data

first=reader.readLine();

String[] datas=first.split(",");

//assigning the data to the appropriate array

if(datas.length>0&&i<objdata.size)

{

objdata.array[i]=datas[0];

objdata.close[i]=Double.parseDouble(datas[1]);

objdata.volume[i]=Integer.parseInt(datas[2]);

objdata.open[i]=Double.parseDouble(datas[3]);

objdata.high[i]=Double.parseDouble(datas[4]);

objdata.low[i]=Double.parseDouble(datas[5]);

}

i++;

objdata.totalFileData++;

}

//stop reading in once there is nothing left from the text file

reader.close();

}

//generic catch block

catch(IOException e)

{

e.printStackTrace();

}

}

//implementation of the printData class

public void printData(MicrosoftMonarchs objdata)

{

//create data member i and set it to zero

int i=0;

//Printing out the data

System.out.println(objdata.totalFileData+"data lines read from 'MicrosoftStockData.txt'");

System.out.println("First 12 days of data ranging from " + objdata.array[0]+"-" +objdata.array[3]);

System.out.println("Date"+" "+"Close"+ " "+"Volume"+" "+"Open"+" "+"High"+" "+"Low/n");

//a for loop which prints out the data four times

for(i=0; i<4; i++)

{

System.out.print(objdata.array[i]+" "+objdata.close[i]+" "+objdata.volume[i]+" "+objdata.open[i]+" "+objdata.high[i]+" "+objdata.low[i]+"/n");

}

}

//implementation of the analyzeData class

public void analyzeData(MicrosoftMonarchs objdata)

{

//declare two variables for both high and low

double highData=objdata.close[0];

double lowData=objdata.close[0];

//declare the indexes

int indexA=0;

int indexB=0;

//

for(int i=1; i<objdata.close.length; i++)

{

if(objdata.close[i]> highData)

{

highData=objdata.close[i];

indexB=i;

}

if(objdata.close[i]< lowData)

{

lowData=objdata.close[i];

indexA=i;

}

}

System.out.println("Highest closing stock data date: "+objdata.array[indexB]+" and volume: "+objdata.volume[indexB]);

System.out.println("Lowest closing stock data date: "+objdata.array[indexA]+" and volume"+objdata.volume[indexA]);

double highDiff=objdata.high[0]-objdata.low[0];

indexB=0;

for(int i=1; i<objdata.close.length; i++)

{

if((objdata.high[i]-objdata.low[i])>highDiff)

{

highDiff=objdata.high[i]-objdata.low[i];

indexB=i;

}

}

System.out.println("Highest diffrence data: "+objdata.array[indexB]+" and value: "+highDiff);

}

}

Explanation / Answer

import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; class MicrosoftMonarchs { //declaring all the arrays public String array[]; public double close[]; public int volume[]; public double open[]; public double high[]; public double low[]; //declaring both size and totalFileData public long totalFileData=0; public int size=5; //main file public static void main(String[] args) { MicrosoftMonarchs data = new MicrosoftMonarchs(); //setting all the arrays equal to the size of the given text data.array= new String[data.size]; data.close= new double[data.size]; data.volume= new int[data.size]; data.open= new double[data.size]; data.high= new double[data.size]; data.low= new double[data.size]; //read in the text file data.readTextFile(data); //print the data from the text file data.printData(data); //analyze the data from the text file data.analyzeData(data); } //implementation of the read in from text file public void readTextFile(MicrosoftMonarchs objdata) { //create data member i and set it to zero int i=0; BufferedReader reader; //a try and catch block try { //reading in the text file reader = new BufferedReader(new FileReader("MicrosoftStockData.txt")); String first=reader.readLine(); //while loop while((first=reader.readLine()) != null) // read first then check if it is null { //reading in the first line with commas in between each piece of data String[] datas=first.split(","); //assigning the data to the appropriate array if(datas.length>0&&i

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