Java

how to store the data?

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Join Date: Sep 2005

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boyzz

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how to store the data?

Sep 12th, 2005

how to store the data read from the txt file, and store it into different array?

for example,

name,age,address

i know how to read them differently, but don know how to store it... :cry:

FileReader fr = new FileReader("abc.txt");

input = new BufferedReader(fr);
line = input.readLine();

while (line != null)
{
StringTokenizer tokens =
new StringTokenizer(line, ", \t");
String token;

while(tokens.hasMoreTokens())
{
token = tokens.nextToken();
System.out.println(token); /* trying to see what is the output, but donno how to store it to different array*/
}
line = input.readLine();

}
input.close();
}

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Join Date: Aug 2005

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chrisbliss18 chrisbliss18 is offline

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Posting Shark

Re: how to store the data?

Sep 12th, 2005

Think about this situation as similar to keeping running totals. Create another variable that will store the complete file. After each read, append the read in data to the variable.

Next time, put your code in [code] tags.

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Join Date: Sep 2005

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boyzz

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Re: how to store the data?

Sep 12th, 2005

how to append the read in data to the variable?

that is what i donno, i've tried looking for it, but its in C...

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Join Date: May 2005

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NPH

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Re: how to store the data?

Sep 12th, 2005

Each row contains a persons info. The best thing to do is create a class that holds each row. Here is an example:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
class PersonInfo
{
	private String name;
	private int age;
	private String address;
 
	public PersonInfo(String name, int age, String address)
	{
		this.name=name;
		this.age=age;
		this.address=address;
	}
}
class PersonInfo
{
	private String name;
	private int age;
	private String address;

	public PersonInfo(String name, int age, String address)
	{
		this.name=name;
		this.age=age;
		this.address=address;
	}
}

Then in your loop above you should write:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
//create array outside
PersonInfo[] listOfInfo = new PersonInfo[100];	//change 100 to the desired size!
 
//maintain # of items in array
int listOfInfoSize=0;
 
//read lines
while (line != null) 
{
	StringTokenizer tokens = new StringTokenizer(line, ", \t");
 
	//get three tokens
	String nameToken = tokens.nextToken();
	String ageToken = tokens.nextToken();
	String addressToken = tokens.nextToken();
 
	//create personinfo object
	PersonInfo obj = new PersonInfo(nameToken, ageToken, addressToken);
 
	//add to array
	listOfInfo[listOfInfoSize++]=obj;
}
//create array outside
PersonInfo[] listOfInfo = new PersonInfo[100];	//change 100 to the desired size!

//maintain # of items in array
int listOfInfoSize=0;

//read lines
while (line != null) 
{
	StringTokenizer tokens = new StringTokenizer(line, ", \t");

	//get three tokens
	String nameToken = tokens.nextToken();
	String ageToken = tokens.nextToken();
	String addressToken = tokens.nextToken();

	//create personinfo object
	PersonInfo obj = new PersonInfo(nameToken, ageToken, addressToken);

	//add to array
	listOfInfo[listOfInfoSize++]=obj;
}

As you see above, the array will hold all the PersonInfo objects. Each PersonInfo object represents a row in the text file. You should add getter methods to the PersonInfo class. Then you can use this array to get any info you need.

For more help, www.NeedProgrammingHelp.com

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Join Date: Sep 2005

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boyzz

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Re: how to store the data?

Sep 12th, 2005

:!: got some idea now... will try this afternoon... :cheesy:

thanks!

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boyzz

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Re: how to store the data?

Sep 13th, 2005

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
//create array outside
PersonInfo[] listOfInfo = new PersonInfo[100];	//change 100 to the desired size!
 
//maintain # of items in array
int listOfInfoSize=0;
 
//read lines
while (line != null) 
{
	StringTokenizer tokens = new StringTokenizer(line, ", \t");
 
	//get three tokens
	String nameToken = tokens.nextToken();
	String ageToken = tokens.nextToken();
	String addressToken = tokens.nextToken();
 
	//create personinfo object
	PersonInfo obj = new PersonInfo(nameToken, ageToken, addressToken);
 
	//add to array
	listOfInfo[listOfInfoSize++]=obj;
}
//create array outside
PersonInfo[] listOfInfo = new PersonInfo[100];	//change 100 to the desired size!

//maintain # of items in array
int listOfInfoSize=0;

//read lines
while (line != null) 
{
	StringTokenizer tokens = new StringTokenizer(line, ", \t");

	//get three tokens
	String nameToken = tokens.nextToken();
	String ageToken = tokens.nextToken();
	String addressToken = tokens.nextToken();

	//create personinfo object
	PersonInfo obj = new PersonInfo(nameToken, ageToken, addressToken);

	//add to array
	listOfInfo[listOfInfoSize++]=obj;
}

the object cannot be created. it says that "non-static variable this cannot be referenced from a static context"

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chrisbliss18 chrisbliss18 is offline

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Posting Shark

Re: how to store the data?

Sep 13th, 2005

Which line did it have a problem with?

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Join Date: Sep 2005

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boyzz

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Re: how to store the data?

Sep 13th, 2005

PersonInfo obj = new PersonInfo(nameToken, ageToken, addressToken);

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chrisbliss18 chrisbliss18 is offline

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Re: how to store the data?

Sep 13th, 2005

Are you creating the PersonInfo class definition in the same file as the rest of your program? If you are, you need to define the PersonInfo class as static.

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Join Date: Sep 2005

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boyzz

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Re: how to store the data?

#10

Sep 13th, 2005

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
	public static void main(String[] args) 
	{
	Item[] abc= new Item[10];
	String line;
	int size=0;
 
	BufferedReader readResults = new BufferedReader(new FileReader("abc.txt"));
	line = readResults.readLine();
 
	while (line!=null)
	{
 
	StringTokenizer tokens = new StringTokenizer(line, ",");
 
	while (tokens.hasMoreTokens()) 
	{
 
	String nameToken = tokens.nextToken();
	int markaToken = Integer.parseInt(tokens.nextToken());
	int markbToken = Integer.parseInt(tokens.nextToken());
 
	abc[size] = new Item(nameToken, markaToken, markbToken);
	size++;
 
	}
	}
 
class Item
{
	private String name;
	private int marka, markb;
 
	public Item(String name, int marka, int markb)
	{
		this.name=name;
		this.marka=marka;
		this.markb=markb;
	}
}
	public static void main(String[] args) 
	{
	Item[] abc= new Item[10];
	String line;
	int size=0;
	
	BufferedReader readResults = new BufferedReader(new FileReader("abc.txt"));
	line = readResults.readLine();
	
	while (line!=null)
	{
	
	StringTokenizer tokens = new StringTokenizer(line, ",");
		
	while (tokens.hasMoreTokens()) 
	{
	
	String nameToken = tokens.nextToken();
	int markaToken = Integer.parseInt(tokens.nextToken());
	int markbToken = Integer.parseInt(tokens.nextToken());

	abc[size] = new Item(nameToken, markaToken, markbToken);
	size++;

	}
	}

class Item
{
	private String name;
	private int marka, markb;

	public Item(String name, int marka, int markb)
	{
		this.name=name;
		this.marka=marka;
		this.markb=markb;
	}
}