Develop Reference

String[] cannot be converted to State[]

Just wondering what I have done wrong here I'm getting an error in the method setLine() which is:
error: incompatible types: String[] cannot be converted to State[]
Im not too sure on what to do to fix it since I need the line to be split and stored in that state array so I can determine whether if it is a state or location when reading from a csv file.
public static void readFile(String inFilename)
{
FileInputStream fileStrm = null;
InputStreamReader rdr;
BufferedReader bufRdr;
int stateCount = 0, locationCount = 0;
String line;
try
{
fileStrm = new FileInputStream(inFilename);
rdr = new InputStreamReader(fileStrm);
bufRdr = new BufferedReader(rdr);
line = bufRdr.readLine();
while (line != null)
{
if (line.startsWith("STATE"))
{
stateCount++;
}
else if (line.startsWith("LOCATION"))
{
locationCount++;
}
line = bufRdr.readLine();
}
fileStrm.close();
State[] state = new State[stateCount];
Location[] location = new Location[locationCount];
}
catch (IOException e)
{
if (fileStrm != null)
{
try { fileStrm.close(); } catch (IOException ex2) { }
}
System.out.println("Error in file processing: " + e.getMessage());
}
}
public static void processLine(String csvRow)
{
String thisToken = null;
StringTokenizer strTok;
strTok = new StringTokenizer(csvRow, ":");
while (strTok.hasMoreTokens())
{
thisToken = strTok.nextToken();
System.out.print(thisToken + " ");
}
System.out.println("");
}
public static void setLine(State[] state, Location[] location, int stateCount, int locationCount, String line)
{
int i;
state = new State[stateCount];
state = line.split("="); <--- ERROR
for( i = 0; i < stateCount; i++)
{
}
}
public static void writeOneRow(String inFilename)
{
FileOutputStream fileStrm = null;
PrintWriter pw;
try
{
fileStrm = new FileOutputStream(inFilename);
pw = new PrintWriter(fileStrm);
pw.println();
pw.close();
}
catch (IOException e)
{
if (fileStrm != null)
{
try
{
fileStrm.close();
}
catch (IOException ex2)
{}
}
System.out.println("Error in writing to file: " + e.getMessage());
}
}

This error occurs, as it just says 'String[] cannot be converted to State[]'. That is like you wanted to store an Integer into a String, it's the same, because the types don't have a relation to each other (parent -> child).
So if you want to solve your problem you need a method which converts the String[] into a State[]. Something like this:
private State[] toStateArray(String[] strings){
final State[] states = new State[strings.length];
for(int i = strings.length-1; i >= 0; i--){
states[i] = new State(strings[i]); // here you have to decide how to convert String to State
}
return states;
}

how to remove 503 exceptions in java

I have a list of names in the form of a CSV and I am up for google searching those names using java. But the problem that i am facing is that when i initially run the code i am able to search the query but in the middle of the code the code starts to throw 503 exceptions and when i again run the code it starts throwing 503 exceptions from the very beginning.Here is the code that i am using.
public class ExtractInformation
{
static String firstname,middlename,lastname;
public static final int PAGE_NUMBERS = 10;
public static void readCSV()
{
boolean first = true;
try
{
String splitBy = ",";
BufferedReader br = new BufferedReader(new FileReader("E:\\KOLDump\\names.csv"));
String line = null;
String site = null;
while((line=br.readLine())!=null)
{
if(first)
{
first = false;
continue;
}
String[] b = line.split(splitBy);
firstname = b[0];
middlename = b[1];
lastname = b[2];
String name = null;
if(middlename == null || middlename.length() == 0)
{
name = firstname+" "+lastname+" OR "+lastname+" "+firstname.charAt(0);
}
else
{
name = firstname+" "+lastname+" OR "+lastname+" "+firstname.charAt(0)+" OR "+firstname+" "+middlename.charAt(0)+". "+lastname;
}
BufferedReader brs = new BufferedReader(new FileReader("E:\\KOLDump\\site.csv"));
while((site = brs.readLine()) != null)
{
if(first)
{
first = false;
continue;
}
String [] s = site.split(splitBy);
String siteName = s[0];
siteName = (siteName.replace("www.", ""));
siteName = (siteName.replace("http://", ""));
getDataFromGoogle(name.trim(), siteName.trim());
}
brs.close();
}
//br.close();
}
catch(Exception e)
{
System.out.println("unable to read file...some problem in the csv");
}
}
public static void main(String[] args)
{
readCSV();
}
private static void getDataFromGoogle(String query,String siteName)
{
Set<String> result = new HashSet<String>();
String request = "http://www.google.co.in/search?q="+query+" "+siteName;
try
{
Document doc = Jsoup.connect(request).userAgent("Chrome").timeout(10000).get();
Element query_results = doc.getElementById("ires");
Elements gees = query_results.getElementsByClass("g");
for(Element gee : gees)
{
Element h3 = gee.getElementsByTag("h3").get(0);
String annotation = h3.getElementsByTag("a").get(0).attr("href");
if(annotation.split("q=",2)[1].contains(siteName))
{
System.out.println(annotation.split("q=",2)[1]);
}
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
any suggestions on how to remove this exceptions from the code would really be helpful.

If you wait a little do the 503's go away? If so, then you're probably being rate-limited by Google. https://support.google.com/gsa/answer/2686272?hl=en
You may need to put some kind of delay between requests.

Java GUI KeyEvent and stuff

Ok.... what I want is for the user to choose what input he wants for my keyPress with a GUI, which i have a place i save and load a config with the VK Key code.
So VK_W = 87 and it saves 87 in a config file. So i want to have a Choice or button that can pick what VK/number that will be pick to be KeyPressed.
Here is my code
public class Twitchbot extends PircBot {
int VK_W = 87;
int VK_S = 83;
int[] saveInformation = {VK_W, VK_S};
int VK_WLoc = 0;
int VK_SLoc = 1;
public Twitchbot() {
configRead("Config.cfg");
updateConfig();
configSave("Config.cfg");
this.setName("Rex__Bot");
}
private void updateConfig(){
System.out.println(VK_W);
System.out.println(VK_S);
VK_W = saveInformation[VK_WLoc];
VK_S = saveInformation[VK_SLoc];
System.out.println(VK_W);
System.out.println(VK_S);
}
private void configRead(String filePath) {
File inputFile;
BufferedReader inputReader;
try {
inputFile = new File(filePath);
inputReader = new BufferedReader(new FileReader(inputFile));
for(int i = 0; i < saveInformation.length; i++){
saveInformation[i] = Integer.parseInt(inputReader.readLine());
}
System.out.println(filePath);
inputReader.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private void configSave(String filePath) {
File outputFile;
BufferedWriter outputWriter;
try {
outputFile = new File(filePath);
outputWriter = new BufferedWriter(new FileWriter(outputFile));
for(int i = 0; i < saveInformation.length; i++){
outputWriter.write(Integer.toString(saveInformation[i]) + "\n");
}
outputWriter.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void onMessage(String channel, String sender, String login, String hostname, String message) {
if(message.equals("up")) {
try {
Robot r = new Robot();
r.keyPress(KeyEvent.VK_W);
r.delay(300);
r.keyRelease(KeyEvent.VK_W);
}catch(Exception ex) {
ex.printStackTrace();
}
}
}
}

How can i return an array in java that is accessible by other objects?

I want to return an array that is accessible by other objects after having read a text file. My instruction parsing class is:
import java.io.*;
public class Instruction {
public String[] instructionList;
public String[] readFile() throws IOException {
FileInputStream in = new FileInputStream("directions.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(in));
int n = 5;
instructionList = new String[n];
for (int j = 0; j < instructionList.length; j++) {
instructionList[j] = br.readLine();
}
in.close();
return instructionList;
}
}
The above takes in a text file with 5 lines of text in it. In my main() I want to run that function and have the string array be accessible to other objects.
import java.util.Arrays;
public class RoverCommand {
public static void main(String[] args) throws Exception {
Instruction directions = new Instruction();
directions.readFile();
String[] directionsArray;
directionsArray = directions.returnsInstructionList();
System.out.println(Arrays.toString(directionsArray));
}
}
What's the best way to do that? I would need the elements of the array to be integers if they are numbers and strings if they are letters. P.S. I'm brand new to Java. is there a better way to do what I'm doing?

You don't have to use generics. I try to catch exceptions in the accessors and return null if anything blows up. So you can test if the value returned is null before proceeding.
// Client.java
import java.io.IOException;
public class Client {
public static void main(String args[]) {
try {
InstructionList il = new InstructionList();
il.readFile("C:\\testing\\ints.txt", 5);
int[] integers = il.getInstructionsAsIntegers();
if (integers != null) {
for (int i : integers) {
System.out.println(i);
}
}
} catch (IOException e) {
// handle
}
}
}
// InstructionList.java
import java.io.*;
public class InstructionList {
private String[] instructions;
public void readFile(String path, int lineLimit) throws IOException {
FileInputStream in = new FileInputStream(path);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
instructions = new String[lineLimit];
for (int i = 0; i < lineLimit; i++) {
instructions[i] = br.readLine();
}
in.close();
}
public String[] getInstructionsAsStrings() {
return instructions; // will return null if uninitialized
}
public int[] getInstructionsAsIntegers() {
if (this.instructions == null) {
return null;
}
int[] instructions = new int[this.instructions.length];
try {
for (int i = 0; i < instructions.length; i++) {
instructions[i] = new Integer(this.instructions[i]);
}
} catch (NumberFormatException e) {
return null; // data integrity fail, return null
}
return instructions;
}
}

check instructionList is null or not. if it is null, call readFile method.
public String[] returnsInstructionList() {
if (instructionList== null){
try { readFile(); } catch(Exception e){}
}
return instructionList;
}
because of readFile can throw exception, it would be good to use one extra variable. like:
private boolean fileReaded = false;
public String[] returnsInstructionList() {
if (!fileReaded){
fileReaded = true;
try { readFile(); } catch(Exception e){}
}
return instructionList;
}
and if readFile can be run concurrently, easiest way to make function synchronized, like
private boolean fileReaded = false;
public synchronized void readFile() throws IOException {
.
.
.
}
public synchronized String[] returnsInstructionList() {
if (!fileReaded){
fileReaded = true;
try { readFile(); } catch(Exception e){}
}
return instructionList;
}

There is no guarantee that readFile is called before returnsInstructionList is invoked. Leaving you returnsInstructionList returning null.
I would :
public String[] getContentsFromFile(String fileName) throws IOException {
FileInputStream in = new FileInputStream(fileName);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
int n = 5;
instructionList = new String[n];
for (int j = 0; j < instructionList.length; j++) {
instructionList[j] = br.readLine();
}
in.close();
return instructionList;
}
Part two to the question you can use generics. To achieve what you want but you have to incorporate a way to say what it is.
Eg
public class Foo {
public ReturnForFoo returnAStringOrIntger(boolean val) {
if(val){
return new ReturnForFoo("String", ValueType.STRING) ;
}
return new ReturnForFoo(10, ValueType.INTEGER); //int
}
}
public class ReturnForFoo {
Object value;
ValueType type;
public ReturnForFoo(Object value, ValueType type) {
this.value=value;
this.type=type
}
// Asume you have getters for both value and value type
public static ENUM ValueType {
STRING,
INTEGER,
UNKNOWN
}
}
This code is in your main.
Foo foo = new Foo();
String value;
int val;
ReturnForFoo returnForFoo = foo.returnAStringOrIntger(true);
// NOTE you can use switch instead of if's and else if's. It will be better
if(returnForFoo.getValueType().equals(ValueType.INTEGER)){
val = (int) returnForFoo.getValue();
} else if(returnForFoo.getValueType().equals(ValueType.STRING)){
value = (String) returnForFoo.getValue();
} else {
// UNKOWN Case
}

Java - error implementing logging code

I want to implement OSGI bundle which can write error messages into log file. I have some some errors in the code that I cannot solve. I have commented the code code where Netbeans give me errors.
public class LoggingSystemImpl implements LoggingSystem {
private final static Calendar calendar = Calendar.getInstance();
private final static String user = System.getenv("USERNAME").toLowerCase();
private final static String sMonth = calendar.getDisplayName(Calendar.MONTH, Calendar.LONG, Locale.ENGLISH);
private final static int y = calendar.get(Calendar.YEAR);
// the name of the log file
//private final String logName = sysDrive + "\\fttb_web - " + sMonth.toLowerCase() + ", " + y + ".log";
private final String logName = "logger - " + sMonth.toLowerCase() + ", " + y + ".log";
private static boolean closed;
private static Log log = null;
private static BufferedWriter bw = null;
private static FileOutputStream fos = null;
private static OutputStreamWriter osw = null;
public LoggingSystemImpl() {
}
public String LoggingSystemUtilization() throws FileNotFoundException{
return "ok";
}
private String Log() throws IOException
{
fos = new FileOutputStream(logName, true);
// set encoding to cyrillic (if available)
if (Charset.isSupported("windows-1251"))
{
osw = new OutputStreamWriter(fos, Charset.forName("windows-1251"));
}
else { osw = new OutputStreamWriter(fos); }
bw = new BufferedWriter(osw, 2048); // 2Mb buffer
return"ok";
}
// intro header for log session
public static synchronized Log getInstance() throws IOException
{
boolean exc = false;
try
{
if (log == null || closed)
{
log = new Log() {};
error message in Netbeans: is not abstract and does not override abstract method getPrintStream() in sun.rmi.runtime.Log
closed = false;
log.writeln("logged in.");
error message: cannot find symbol
symbol: method writeln(java.lang.String)
location: variable log of type sun.rmi.runtime.Log
log.nl();
error message: cannot find symbol
symbol: method nl()
location: variable log of type sun.rmi.runtime.Log
}
}
catch(IOException x) { exc = true; throw x; }
catch(Exception x) { exc = true; x.printStackTrace(); }
finally
{
if (exc)
{
try
{
if (fos != null) { fos.close(); fos = null; }
if (osw != null) { osw.close(); fos = null; }
if (bw != null) { bw.close(); bw = null; }
}
catch(Exception x) { x.printStackTrace(); }
}
}
return log;
}
public synchronized void nl()
{
try { bw.newLine(); }
catch(IOException x) {x.printStackTrace();}
}
public synchronized void nl(int count)
{
try
{
for (int i = 0; i < count; i++) bw.newLine();
}
catch(IOException x) {x.printStackTrace();}
}
public synchronized void writeln(String s)
{
try { bw.write(getTime() + ": " + s); bw.newLine(); }
catch(IOException x) {x.printStackTrace();}
}
public synchronized void write(String s)
{
try { bw.write(s); }
catch (IOException x) {x.printStackTrace();}
}
public synchronized void close()
{
try
{
if (bw != null)
{
writeln("logged out.");
nl();
bw.flush();
bw.close();
closed = true;
fos = null;
osw = null;
bw = null;
}
}
catch(IOException x) { x.printStackTrace(); }
}
public synchronized boolean isClosed() { return closed; }
public synchronized void writeException(Exception x)
{
writeln("");
write("\t" + x.toString()); nl();
StackTraceElement[] ste = x.getStackTrace();
int j = 0;
for (int i = 0; i < ste.length; i++)
{
if (i < 15) { write("\t\tat " + ste[i].toString()); nl(); }
else { j++; }
}
if (j > 0) { write("\t\t... " + j + " more"); nl(); }
nl(2);
}
private String getTime()
{
Calendar c = Calendar.getInstance();
int month = c.get(Calendar.MONTH) + 1;
int d = c.get(Calendar.DAY_OF_MONTH);
int h = c.get(Calendar.HOUR_OF_DAY);
int m = c.get(Calendar.MINUTE);
int s = c.get(Calendar.SECOND);
int y = c.get(Calendar.YEAR);
String dd = d < 10 ? "0"+d : ""+d;
String hh = h < 10 ? "0"+h : ""+h;
String mm = m < 10 ? "0"+m : ""+m;
String ss = s < 10 ? "0"+s : ""+s;
String sm = month < 10 ? "0"+month : ""+month;
return user + " [" + y + "." + sm + "." + dd + " " + hh + ":" + mm + ":" + ss + "]";
}
}

Unless there's some reason why you need to create your own logging mechanism I would use log4j.
It's fairly simple to configure and get working properly and would save you a lot of time.

I'm almost certain you are using the wrong Log class. Anything in sun.* packages is not for user consumption.
If you want logging for your code, use the java.util.logging library or log4j. Or maybe OSGI provides a framework.