Need java help on reading intger elements from file to array list

[needhelp123]

Hi all,

any body could help in reading integer values from .txt to array list and after transferring the dates from array list to another .txt file

there should be two files....

[prometheuzz]

Hi all,

any body could help in reading integer values from .txt to array list and after transferring the dates from array list to another .txt file

there should be two files....

Sure, with what part of the assignment are you having trouble with?

[nomad]

Hi all,

any body could help in reading integer values from .txt to array list and after transferring the dates from array list to another .txt file

there should be two files....

Question you need to ask yourself
How do you want to retreive your text files. by a scanner or static.
how do you want to output your t.txt file.
How many data types do you need.
Where do you want to store the output txt files
nomad

[needhelp123]

Sure, with what part of the assignment are you having trouble with?

the following information is enought i hope...
* Create a file called Unsorted.txt.
* Store the Unsorted values in this file.
* Read the values from the Unsorted.txt file.
* Sort the values
* Store the sorted values in new file. Name it as Sorted.txt

Implement this only for the following algorithms.

Bubble sort

[needhelp123]

Question you need to ask yourself
How do you want to retreive your text files. by a scanner or static.
how do you want to output your t.txt file.
How many data types do you need.
Where do you want to store the output txt files
nomad

I hope following information is enough....

* Create a file called Unsorted.txt.
* Store the Unsorted values in this file.
* Read the values from the Unsorted.txt file.
* Sort the values
* Store the sorted values in new file. Name it as Sorted.txt

Implement this only for the following algorithms.

Bubble sort

[nomad]

I hope following information is enough....

* Create a file called Unsorted.txt.
* Store the Unsorted values in this file.
* Read the values from the Unsorted.txt file.
* Sort the values
* Store the sorted values in new file. Name it as Sorted.txt

Implement this only for the following algorithms.

Bubble sort

Have you read how to I/O files yet and do you know how to create a Arraylist?

nomad

[prometheuzz]

the following information is enought i hope...
* Create a file called Unsorted.txt.
* Store the Unsorted values in this file.
* Read the values from the Unsorted.txt file.
* Sort the values
* Store the sorted values in new file. Name it as Sorted.txt

Implement this only for the following algorithms.

Bubble sort

What I meant to say with my post is this: if you don't have any idea where (or how) to start coding *something*, then I cannot help you and you should either hire a private tutor or have a talk with your teacher (I don't mean to put you down!).

But, if you have coded something up and you're getting compiler/runtime errors you don't understand what they mean: post your code AND errors here and explain what it is you're having a hard time with: I'll try to help you.

Good luck.

[nomad]

I hope following information is enough....

* Create a file called Unsorted.txt.
* Store the Unsorted values in this file.
* Read the values from the Unsorted.txt file.
* Sort the values
* Store the sorted values in new file. Name it as Sorted.txt

Implement this only for the following algorithms.

Bubble sort

like prometheuzz we can not help you without see some form of coding.
I'm also new to Java and I willing to help you learn Java from an entry level view points

good luck

[needhelp123]

Have you read how to I/O files yet and do you know how to create a Arraylist?

nomad

i know all the things....
to read and create array list
and even i have the program tooo

i need a code where i can transfer data from text to array list....
i am not aware of this little bit...

if i kno this so i can implement the rest...

[needhelp123]

What I meant to say with my post is this: if you don't have any idea where (or how) to start coding *something*, then I cannot help you and you should either hire a private tutor or have a talk with your teacher (I don't mean to put you down!).

But, if you have coded something up and you're getting compiler/runtime errors you don't understand what they mean: post your code AND errors here and explain what it is you're having a hard time with: I'll try to help you.

Good luck.

hi prometheuzz
thanks for your concern... i have the program code just i need to know about how to transfer integer data from text file to array list...

[nomad]

i know all the things....
to read and create array list
and even i have the program tooo

i need a code where i can transfer data from text to array list....
i am not aware of this little bit...

if i kno this so i can implement the rest...

if that is the case then you need to use the get()method and set() methods for your data types.

nomad

[prometheuzz]

hi prometheuzz
thanks for your concern... i have the program code just i need to know about how to transfer integer data from text file to array list...

Have a look at Sun's I/O tutorial:
http://java.sun.com/docs/books/tutorial/essential/io/scanning.html

[needhelp123]

if that is the case then you need to use the get()method and set() methods for your data types.

nomad

this is my java program

 public class BubbleSort { 
 
int[] bsArrays = new int[5];
int i; //indexing for array(outer loop counter)
int j; //indexing for array*(inner loop counter)
 
 
/**
* Adds element into an array
* sorts the array and print final value...
*/
private void setBubblesort() {
 
// Insert elements into an array
bsArrays[0] = 20;
bsArrays[1] = 10;
bsArrays[2] = 50;
bsArrays[3] = 100;
bsArrays[4] = 05;
 
int temp = 0; //variable to store value during manipulation
 
System.out.println("Bubble Sort");
System.out.println(" ");
System.out.println(" ");
System.out.println("Data before Soring ");
System.out.println("**************** ");
for (int val = 0; val < 5; val ++) {
System.out.println("Value at index" + val + " = " + bsArrays[val]); 
}
 
//swaping an elemens
for (i = 0; i < 4; i++ ) {
     for (j = i + 1; j < 5; j ++) {
     if (bsArrays[i] > bsArrays[j]) {
     temp = bsArrays [ i ];
     bsArrays[i] = bsArrays[j];
     bsArrays[j] = temp;
     }
}
}
 
//output: final sorted elements in ana array
System.out.println(" ");
System.out.println(" ");
System.out.println(" After Sorting " );
System.out.println(" **************** ");
for (int fval = 0; fval < 5; fval ++) {
System.out.println("Value at index" + fval + " = " + 
bsArrays[fval]);
}
}
 
/**
* The main method illustrates the use of a Bubble sort
* for small array
*/
public static void main(String str[]) {
BubbleSort acc = new BubbleSort();
acc.setBubblesort();
}
}
 

here i have inserted elements directly in the program.. in spite of that i need to get those elements from text file what i mentioned before...

[needhelp123]

Have a look at Sun's I/O tutorial:
http://java.sun.com/docs/books/tutorial/essential/io/scanning.html

thank you...
it might help in implenting code if my TL... sujst to use scanner

[prometheuzz]

thank you...
it might help in implenting code if my TL... sujst to use scanner

You can or can't use the Scanner class?

Anyway, Scanner examples can be found in the tutorial I posted, and here's an example of how to do it without the Scanner class:

import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader buffer = 
            new BufferedReader(new FileReader("Main.java"));
        String lineOfText;
        while((lineOfText = buffer.readLine()) != null) {
            System.out.println("> "+lineOfText);
        }
        buffer.close();
    }
}

Have a look at the java.lang.Integer class how to parse a String to a numerical value.

Good luck.

[nomad]

You can or can't use the Scanner class?

Anyway, Scanner examples can be found in the tutorial I posted, and here's an example of how to do it without the Scanner class:

import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader buffer = 
            new BufferedReader(new FileReader("Main.java"));
        String lineOfText;
        while((lineOfText = buffer.readLine()) != null) {
            System.out.println("> "+lineOfText);
        }
        buffer.close();
    }
}

Have a look at the java.lang.Integer class how to parse a String to a numerical value.

Good luck.

clue read() method
nomad

[needhelp123]

clue read() method
nomad

s by using parseint

even i kno this concept but but what i need is.... how you will put this into an array

[prometheuzz]

clue read() method
nomad

I would't do that: read() only return single characters. How will you read a numerical value which is larger than 9?

[prometheuzz]

s by using parseint
...

Yes, that is correct.

...
even i kno this concept but but what i need is.... how you will put this into an array

You needed to use an ArrayList and not an array, right?
Well then, create an instance of an ArrayList and use it's add methof to add Integers to it. That's all there is to it!
; )

[nomad]

I would't do that: read() only return single characters. How will you read a numerical value which is larger than 9?

so this would not work
This folowing statement use a while loo to read the data file in a FileInputStream object. called largerfile:

int newByte = 0;
while (newByte != -1) {
newByte =largerfile.read();
System.out.print(newByte + " ");
}

nomad

[needhelp123]

Yes, that is correct.




You needed to use an ArrayList and not an array, right?
Well then, create an instance of an ArrayList and use it's add methof to add Integers to it. That's all there is to it!
; )

can u please give example for this....

[JosAH]

so this would not work
This folowing statement use a while loo to read the data file in a FileInputStream object. called largerfile:

int newByte = 0;
while (newByte != -1) {
newByte =largerfile.read();
System.out.print(newByte + " ");
}

nomad

No insult intended but you'd better leave this thread to Prometheuzz; he can
handle this fine. He doesn't need your or my intervening remarks here. If you
want to know anything about stream IO feel free to start your own thread about
it and I'll read (and possibly answer) your question too. Prometheuzz is right
on target with this thread; read all about it and feel free to post corrections.

kind regards,

Jos

[needhelp123]

can u please give example for this....

can you plese give exAMPLE FOR THIS PRO

[prometheuzz]

can you plese give exAMPLE FOR THIS PRO

Like I said: I don't know exactly what it is you need help with, and begging for code isn't helping you either.

You had better show me (or us) that you put some effort and research in what I have suggested to you because I pretty much told you what to do in order to finish this assignment.

If there is something not clear to you, then you need to be specific and tell me (us) what it is you don't understand.


Edit: I'll check up on this thread tomorrow morning because it's way passed my bed time (says my girlfriend).

[needhelp123]

Like I said: I don't know exactly what it is you need help with, and begging for code isn't helping you either.

You had better show me (or us) that you put some effort and research in what I have suggested to you because I pretty much told you what to do in order to finish this assignment.

If there is something not clear to you, then you need to be specific and tell me (us) what it is you don't understand.


Edit: I'll check up on this thread tomorrow morning because it's way passed my bed time (says my girlfriend).

ok dude...
i need help that
i need a coding help to transfer those data to array element....

[r035198x]

ok dude...
i need help that
i need a coding help to transfer those data to array element....

Follow the advice that has been given already. If you get stuck with it, no problem. Just post the code that you will have written and see what happens.

[needhelp123]

Follow the advice that has been given already. If you get stuck with it, no problem. Just post the code that you will have written and see what happens.

[/quote]


thank you people helping in that mean procedure,,,,,,,,,,,,
i got a code

[prometheuzz]

thank you people helping in that mean procedure,,,,,,,,,,,,
i got a code

What are you tryinh to say with: mean procedure? Do you feel you are treated badly?
And what do you mean by: i got a code?

[JosAH]

What are you tryinh to say with: mean procedure? Do you feel you are treated badly?
And what do you mean by: i got a code?

My guess is that the OP managed to scrape a non-understood snippet of code
from the internet somewhere which (sort of) compiles and (sort of) seems to do
what the OP wants it to do. Programming is a mean business indeed ;-)

Confused? Watch out for the next episode for "Teh WAnTeD CodeZ!!!eleven11!"

kind regards,

Jos

[needhelp123]

What are you tryinh to say with: mean procedure? Do you feel you are treated badly?
And what do you mean by: i got a code?

no i am not...

just i said u that.. i have worked on that... and i got that concept....

of data transfer from file to array list..

using bufferreader, and bufferwriter... for input and out put...

using fileinput stream...
thank you prom.. for helping me in this