C Buffer To Java String

Sep 4, 2014

Due to compatibility reasons, I need to be able to store a random C buffer inside of a Java String. THis means that the Java String should contain the exact same buffer information (i.e. byte sequence) as the original C buffer. How would I do that?

All the functions I found will always somehow code/decode the C buffer, and modify its content depending on the selected encoding.

I need to do this inside JNI. Following is what I have:

Java Code:

unsigned char* cBuffer=getCBuffer();

// Transfer the C buffer to s:
jstring s=NULL;
if (env->EnsureLocalCapacity(2) >= 0)
{
jbyteArray bytes = env->NewByteArray(signalLength);
if (bytes != NULL)

[Code] ....

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String Buffer Append Method

Feb 17, 2014

I have the following code which always gives me java heap space error because of line number 65 due to string buffer append method in this line, I don't know why?

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
import samy.*;
import java.util.Scanner;
public class InfixToPostfix {
OrderedList list = new OrderedList();
Scanner input = new Scanner(System.in);
public StringBuffer postfix = new StringBuffer();

[Code] .....

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Apr 3, 2014

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Apr 15, 2014

So I have this file in which has a few sentences on a single line. What I need to be able to do is read the file and then take each word and create a token out of it. Then what it does is it selects the first letter of every 5th word, uppercase it, and then allow me to use append it via a stringbuffer object to create a word out of it.

I know I'll need to use a string tokenizer but I'm not sure how to do so in a way that makes each word separate and how to tell it to only hit the 1st letter of every 5th word.

Here's what I've come up with so far, but I'm currently at a loss at what to do and my textbook/documentation is just not working.

Java Code:

String line; // The line we read from the file.
char letter; // The first letter of each 5th word.
String sw; // The completed string.
public static void main (String [] args)throws IOException {

[Code] ....

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Mar 5, 2014

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Mar 26, 2014

i am having a below piece of code in my worker thread. In my output i am getting xml records from the database. I'm sending this output to a input stream & finally to a sax parser.My query is, before sending to the parser i need to store the input stream in buffer. The buffer should store 1000 records. For every 1000 records the parser should be called from buffer.

while (orset.next()) {
output = orset.getString("xmlrecord");
writeCount++;
InputStream in = new ByteArrayInputStream(output.getBytes("UTF-8"));
InputStream inputStream = new ByteArrayInputStream(output.getBytes("UTF-8"));
Reader reader = new InputStreamReader(inputStream,"UTF-8");

[code]....

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Jul 12, 2014

I'm writing a simple application, that provides a Swing GUI to a bounded-buffer problem. The application is composed by:

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- MyThread.java: it's an extension of Thread, and it shows a Swing GUI associated to this thread. Each thread is associated a GUI.

- GUI.java

- Database.java: it's an extension of ArrayList and and it can contain a maximum of five elements. An element is an instance of the class User. Also it implements put() and extract() method consistent with the algorithm of bounded-buffer problem.

- DatabaseException.java: it's a simple message.

- User.java

public class Main {
public static void main(String[] args) {
Database db = new Database();
Map<String, Thread> tdg_m = new HashMap();
for (int i = 1; i <= 4; i++) {
tdg_m.put("T" + i, new MyThread(db));

[Code] .....

The issue is the following. When the database is full, and i try to put an element, the GUI freezes. The same problem occurs when I try to extract an element from the empty database.

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Aug 11, 2014

Normally I would just implement a circular buffer and be happy but there's a fundamental problem with that.OK, so I'm working on a piece of cheap Android hardware that's being used for demo purposes. One of the problems, primarily because it's cheap (imo) is that the screen input is not clean and is interfering with the UI experience. Specifically when gliding your finger, the result is quite non linear.

I know that's not the best drawing but it sort of explains the problem to a degree. In reality, it's probably a bit smoother than that, but there is still noisy data getting in, and the problem is it causes the UI to be jittery at times.

I would like to smooth this using something like a Circular Buffer. Now I figured the best way to do this would be to store the last 4 float inputs and then effectively calculate the next value based on an average, so say our input was this:10, 15, 20, 25 and 35 is the current input.

15 - 10 = 5
20 - 15 = 5
25 - 20 = 5

Then for the next value, 35 - 25 = 10. 10 + (3 * 5) = 25 / 4 = 6.25...Then adding 6.25 to the previous value resulting in this: 10 15 20 25 31.25 which would appear theoretically smoother. However I'm struggling to work out in my head the best way to implement such a function.

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May 9, 2014

If I am given a string such as:
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Jan 18, 2010

I couldn't get this code working:

import java.util.*;
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public static void main (String args[]) {
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[Code] .....

Did i write something wrong or can't Scanner be used with String?

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Oct 7, 2014

Here is my code:

public class ReverseString {
public static void main(String args[]) {
//quick wasy to reverse String in Java - Use StringBuffer
String str = "The rain in Spain falls mainly on the plain";
String revString = new StringBuffer(str).reverse().toString();

[Code] .....

The requirements: The program runs but for some reason it is not meeting the requirements. use the String method toCharArray and a loop to display the letters in the string in reverse order.

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Apr 16, 2014

import java.io.*;
import java.util.*;
import java.util.StringTokenizer;
class read

[code]...

my code compiles and prints the text contained in the file but the tockenizer isnt working.

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Jun 26, 2014

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I tried this :

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Apr 17, 2014

I have written below regex for two lines.

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s+ is a newline character.

But when I combines both as below, its not giving me expected result.

^(((?=.{1,35}$)(/([A-Z]{1,5})(|(//[a-zA-Z0-9]+))))(|((s+(//[a-zA-Z0-9]{1,33})){1,2})))$

For string "/ABC//FGhiJkl012345

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I think there is some problem in lookahead placed.

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Jul 21, 2014

I am currently trying to split the string "EAM est" between the part. I have gotten the code to work if the was a -. But I can't see why the error is occuring

I have tried

String test = "EAM-testing";
String[] parts = test.split("-");
System.out.println("parts[0] = " + parts[0]);
System.out.println("parts[1] = " + parts[1]);
String test1 = "EAM esting";
String[] parts1= test1.split("");

[Code] .....

The error occurs at line: String[] parts1= test1.split("");

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Aug 27, 2014

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Feb 28, 2015

I am solving a problem in which first my program will ask a number N and then N numbers form the user

suppose:
5
4 3 4 5 6

another
6
3 2 7 8 9 3

and I am using this code

inputValues=new LinkedHashMap<Integer, Integer>();
Scanner in=new Scanner(System.in);
int N=in.nextInt();
String inputString=in.nextLine();

[Code] .....

But its not working as i want . Where is fault?

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Mar 6, 2014

In the Employee's toString, you are using the NumberFormat class to format your hourly rate and weekly pay but you are supposed to use java string formatting only (%f). You should change those to use only string formatting - no use of NumberFormat.

package coursework;
import java.text.NumberFormat;
public class Employee {
private String firstName;
private String lastName;
private int employeeId;
private double hourlyRate;
public Timecard timeCard;
 
[Code] .....

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Dec 24, 2014

In the code below I am splitting the String relativeDN at the "," character. After splitting the String I need to parse the string from the "=" character using indexof and then rebuild the string. I was able to parse the first = sign then rebuild the string but it doesn't remove the subsequent = character. I am trying to parse the string using idexof for all the "=" characters and then rebuild it using StringBuilder. 
 
public class StringTestProgram {
public static void main(String[] args) {
  String relativeDN = "cn=abc,dn=xyz,ou=abc/def";
  //Split String
  String[] stringData = relativeDN.split(",");
 
[Code] ....

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Apr 8, 2013

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double ranUtil, CPUUtil;
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Apr 4, 2015

I am at a loss when it comes to appending Strings to a text file in Java. I was tasked (yes, homework) to complete a program that does the following simple things:

Print out the contents of a text file to the user (got that!)

Ask the user if the want to add any customers to this text file (got it!)

Add those customer's name's, addresses, postal codes and cities. (got that too)

Verify the postal code is in the proper format (yep!)

Add the new information to the text file, and display it to the user (Nope...)

The program is, essentially, supposed to keep track of the user's customers, and store this information to a text file. However, when I run the following code, I get a number of errors:

static String firstOutput, name, address, city, postalCode, file = "";
static int customer = 0;
static String fileLine = "";
public static void main(String[] args) throws IOException {
file = "C:UsersOwnerDocumentsDiscountFly.txt";

[Code] .....

The errors I get are:

Java.io.exception. Main. Stream closed
ensureOpen (115)
ava.io.BufferedReader.readLine(BufferedReader.java:310)

I understand that the numbers correspond to lines of code (line 115, or 310, for example) but I am unsure of how to fix these errors.

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