public static void main(String args[]) {
int a = 2147483647;
System.out.println(a + 5);
}
Outputs
-2147483644
const Integer = Java.type("java.lang.Integer");
const w = new Integer(2147483647)
console.log(w + 5)
console.log(w + new Integer(5));
GraalJS with node --jvm .\ex.js outputs
2147483652
2147483652
Which is wrong. I thought GraalJS was supposed to simulate Java? How do I make it handle the overflow correctly?
Related
I am new to JAVA. I don't understand why JAVA give me two souts.
(Input row & column (throw 1 space): Input row & column (throw 1 space): )
In the first pass, it does not wait for my input and think str = "". And in the second pass its waiting for my input.
Ssory, I forgot to tell that beforŠµ this block of code - my Scanner was opened. I asked program:
while (true) {
System.out.print("Enter game size (3 - 20): ");
if (SCAN.hasNextInt()) {
return SCAN.nextInt();
}
System.out.println(SCAN.next() + " - not a number!");
I think I should clear scanners buffer ( /n ). But I dont know how.
private static void humanTurn() {
System.out.println("HUMAN TURN");
String str;
String regex = "\\d{1,2}\\s\\d{1,2}";
Pattern myPattern = Pattern.compile(regex); // Pattern for checking
boolean checkPattern;
int x, y;
do {
do {
System.out.print("Input row & column (throw 1 space): ");
str = SCAN.nextLine();
Matcher myMatcher = myPattern.matcher(str);
checkPattern = myMatcher.matches();
} while (!checkPattern);
String[] strArr = str.split(" ");
x = Integer.parseInt(strArr[0]) - 1;
y = Integer.parseInt(strArr[1]) - 1;
} while (!isValidCell(x, y));
I have tried to guess your code. This is what I come up with. Still works fine. Let me know if anything else.
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
private static Scanner sc = new Scanner(System.in);
private static int size = 0;
public static void main(String[] args) {
size = getBoardSize();
humanTurn();
}
private static int getBoardSize() {
while (true) {
System.out.print("Enter game size (3 - 20): ");
if (sc.hasNextInt()) {
return sc.nextInt();
}
System.out.println(sc.next() + " - not a number!");
}
}
private static void humanTurn() {
System.out.println("HUMAN TURN");
String str;
String regex = "\\d{1,2}\\s\\d{1,2}";
Pattern myPattern = Pattern.compile(regex); // Pattern for checking
boolean checkPattern;
int x, y;
do {
do {
System.out.print("Input row & column (throw 1 space): ");
str = sc.nextLine();
Matcher myMatcher = myPattern.matcher(str);
checkPattern = myMatcher.matches();
} while (!checkPattern);
String[] strArr = str.split(" ");
x = Integer.parseInt(strArr[0]) - 1;
y = Integer.parseInt(strArr[1]) - 1;
} while (!isValidCell(x, y));
}
private static boolean isValidCell(int x, int y) {
return x < size && y < size && x >= 0 && y >= 0;
}
}
As part of my final year project, I am testing the Bouncycastle library on SHA-3.
I have found the source code to calculate the hash value of a string:
String input = "hello" ;
SHA3.DigestSHA3 digestSHA3 = new SHA3.Digest256();
byte[] digest = digestSHA3.digest(input.getBytes());
System.out.println("SHA3-256 = " + Hex.toHexString(digest));
but i want to calculate the hash value of a matrix, Anyone who can help me with this?
You need to uniquely convert matrix to byte array. One of the possible solutions:
private static byte[] intToBytes(int value) {
return new byte[] {
(byte)(value >>> 24),
(byte)(value >>> 16),
(byte)(value >>> 8),
(byte)value
};
}
public static void main(String[] args) throws Exception {
int[][] matrix = new int[3][5];
SHA3.DigestSHA3 sha3 = new SHA3.Digest256();
int height = matrix.length;
int width = matrix[0].length;
sha3.update(intToBytes(height)); // add height of the matrix
sha3.update(intToBytes(width)); // add width
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
sha3.update(intToBytes(matrix[i][j])); // add all values
}
}
byte[] digest = digest.digest();
}
I'm trying to route ASIO audio to my playback devices, however, all I hear is static.
ASIO Setup
BIT_PER_SAMPLE = 24
SAMPLE_RATE = 48000
Currently, trying with 1 channel into 1 playback device called "Line 1" for testing. The playback of the sound is static.
EDIT: The code below has been updated. It will take 64 channels of ASIO input and route them one at a time into Waveout devices (I'm using Virtual Audio Cable to create them)
private static AsioOut asioOut;
private static AsioInputPatcher inputPatcher;
private static readonly int BIT_PER_SAMPLE = 16;
private static readonly int SAMPLE_RATE = 48000;
private static readonly int NUMBER_OF_CHANNELS = 64;
private static BufferedWaveProvider[] bufferedWaveProviders = new BufferedWaveProvider[NUMBER_OF_CHANNELS];
private static WaveOut[] waveouts = new WaveOut[NUMBER_OF_CHANNELS];
[STAThread]
static void Main(string[] args)
{
InitDevices();
Record();
while (true)
{
Console.WriteLine("Recording...press any key to Exit.");
Console.ReadKey(true);
break;
}
asioOut.Stop();
asioOut.Dispose();
asioOut = null;
}
private static void Record()
{
inputPatcher = new AsioInputPatcher(SAMPLE_RATE, NUMBER_OF_CHANNELS, NUMBER_OF_CHANNELS);
asioOut = new AsioOut(AsioOut.GetDriverNames()[0]);
asioOut.InitRecordAndPlayback(new SampleToWaveProvider(inputPatcher),
NUMBER_OF_CHANNELS, 0);
asioOut.AudioAvailable += OnAsioOutAudioAvailable;
asioOut.Play();
}
private static void InitDevices()
{
for (int n = -1; n < WaveOut.DeviceCount; n++)
{
WaveOutCapabilities caps = WaveOut.GetCapabilities(n);
if (caps.ProductName.StartsWith("Line"))
{
int _number = int.Parse(caps.ProductName.Split(' ')[1]);
if (_number <= NUMBER_OF_CHANNELS)
{
waveouts[_number - 1] = new WaveOut() { DeviceNumber = n };
bufferedWaveProviders[_number - 1] = new BufferedWaveProvider(new WaveFormat(SAMPLE_RATE, BIT_PER_SAMPLE, 2));
waveouts[_number - 1].Init(bufferedWaveProviders[_number - 1]);
waveouts[_number - 1].Play();
}
}
}
}
static void OnAsioOutAudioAvailable(object sender, AsioAudioAvailableEventArgs e)
{
inputPatcher.ProcessBuffer(e.InputBuffers, e.OutputBuffers,
e.SamplesPerBuffer, e.AsioSampleType);
for (int outputChannel = 0; outputChannel < e.OutputBuffers.Length; outputChannel++)
{
byte[] buf = new byte[e.SamplesPerBuffer * (BIT_PER_SAMPLE / 8)];
Marshal.Copy(e.OutputBuffers[outputChannel], buf, 0, e.SamplesPerBuffer * (BIT_PER_SAMPLE / 8));
bufferedWaveProviders[outputChannel].AddSamples(buf, 0, buf.Length);
}
e.WrittenToOutputBuffers = true;
}
There are two main problems with your code. First, InputBuffers is one per channel, not sample. Second, when you set e.WrittenToOutputBuffers = true you are saying that you have written to e.OutputBuffers which you haven't. So they will just contain uninitialized data.
If you want to see an example of low-level manipulation of ASIO buffers, then check out my ASIO patch bay sample project.
I m trying to create new tokenizer by refering book tamingtext (which uses lucene 3.+ api) using new lucene api 7.3, but it is giving me error as mentioned below
java.lang.IllegalStateException: TokenStream contract violation: reset()/close() call missing, reset() called multiple times, or subclass does not call super.reset(). Please see Javadocs of TokenStream class for more information about the correct consuming workflow.
at org.apache.lucene.analysis.Tokenizer$1.read(Tokenizer.java:109)
at java.io.Reader.read(Reader.java:140)
at solr.SentenceTokenizer.fillSentences(SentenceTokenizer.java:43)
at solr.SentenceTokenizer.incrementToken(SentenceTokenizer.java:55)
at solr.NameFilter.fillSpans(NameFilter.java:56)
at solr.NameFilter.incrementToken(NameFilter.java:88)
at spec.solr.NameFilterTest.testNameFilter(NameFilterTest.java:81)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Here is my SentenceTokenizer class
Initializing method, in older api there was super(Reader); but in current api there is no access to Reader class
public SentenceTokenizer(SentenceDetector detector) {
super();
setReader(reader);
this.sentenceDetector = detector;
}
Here is my reset method
#Override
public void reset() throws IOException {
super.reset();
sentenceDetector = null;
}
When i tried to access this method from custom TokenFilter, I m getting above error
public void fillSentences() throws IOException {
char[] c = new char[256];
int size = 0;
StringBuilder stringBuilder = new StringBuilder();
while ((size = input.read(c)) >= 0) {
stringBuilder.append(c, 0, size);
}
String temp = stringBuilder.toString();
inputSentence = temp.toCharArray();
sentenceSpans = sentenceDetector.sentPosDetect(temp);
tokenOffset = 0;
}
#Override
public final boolean incrementToken() throws IOException {
if (sentenceSpans == null) {
//invoking following method
fillSentences();
}
if (tokenOffset == sentenceSpans.length) {
return false;
}
Span sentenceSpan = sentenceSpans[tokenOffset];
clearAttributes();
int start = sentenceSpan.getStart();
int end = sentenceSpan.getEnd();
charTermAttribute.copyBuffer(inputSentence, start, end - start);
positionIncrementAttribute.setPositionIncrement(1);
offsetAttribute.setOffset(start, end);
tokenOffset++;
return true;
}
Here is my custom TokenFilter class
public final class NameFilter extends TokenFilter {
public static final String NE_PREFIX = "NE_";
private final Tokenizer tokenizer;
private final String[] tokenTypeNames;
private final NameFinderME[] nameFinderME;
private final KeywordAttribute keywordAttribute = addAttribute(KeywordAttribute.class);
private final PositionIncrementAttribute positionIncrementAttribute = addAttribute(PositionIncrementAttribute.class);
private final CharTermAttribute charTermAttribute = addAttribute(CharTermAttribute.class);
private final OffsetAttribute offsetAttribute = addAttribute(OffsetAttribute.class);
private String text;
private int baseOffset;
private Span[] spans;
private String[] tokens;
private Span[][] foundNames;
private boolean[][] tokenTypes;
private int spanOffsets = 0;
private final Queue<AttributeSource.State> tokenQueue =
new LinkedList<>();
public NameFilter(TokenStream in, String[] modelNames, NameFinderME[] nameFinderME) {
super(in);
this.tokenizer = SimpleTokenizer.INSTANCE;
this.nameFinderME = nameFinderME;
this.tokenTypeNames = new String[modelNames.length];
for (int i = 0; i < modelNames.length; i++) {
this.tokenTypeNames[i] = NE_PREFIX + modelNames[i];
}
}
//consumes tokens from the upstream tokenizer and buffer them in a
//StringBuilder whose contents will be passed to opennlp
protected boolean fillSpans() throws IOException {
if (!this.input.incrementToken()) return false;
//process the next sentence from the upstream tokenizer
this.text = input.getAttribute(CharTermAttribute.class).toString();
this.baseOffset = this.input.getAttribute(OffsetAttribute.class).startOffset();
this.spans = this.tokenizer.tokenizePos(text);
this.tokens = Span.spansToStrings(spans, text);
this.foundNames = new Span[this.nameFinderME.length][];
for (int i = 0; i < nameFinderME.length; i++) {
this.foundNames[i] = nameFinderME[i].find(tokens);
}
//insize
this.tokenTypes = new boolean[this.tokens.length][this.nameFinderME.length];
for (int i = 0; i < nameFinderME.length; i++) {
Span[] spans = foundNames[i];
for (int j = 0; j < spans.length; j++) {
int start = spans[j].getStart();
int end = spans[j].getEnd();
for (int k = start; k < end; k++) {
this.tokenTypes[k][i] = true;
}
}
}
spanOffsets = 0;
return true;
}
#Override
public boolean incrementToken() throws IOException {
//if there's nothing in the queue
if(tokenQueue.peek()==null){
//no span or spans consumed
if (spans==null||spanOffsets>=spans.length){
if (!fillSpans())return false;
}
if (spanOffsets>=spans.length)return false;
//copy the token and any types
clearAttributes();
keywordAttribute.setKeyword(false);
positionIncrementAttribute.setPositionIncrement(1);
int startOffset = baseOffset +spans[spanOffsets].getStart();
int endOffset = baseOffset+spans[spanOffsets].getEnd();
offsetAttribute.setOffset(startOffset,endOffset);
charTermAttribute.setEmpty()
.append(tokens[spanOffsets]);
//determine of the current token is of a named entity type, if so
//push the current state into the queue and add a token reflecting
// any matching entity types.
boolean [] types = tokenTypes[spanOffsets];
for (int i = 0; i < nameFinderME.length; i++) {
if (types[i]){
keywordAttribute.setKeyword(true);
positionIncrementAttribute.setPositionIncrement(0);
tokenQueue.add(captureState());
positionIncrementAttribute.setPositionIncrement(1);
charTermAttribute.setEmpty().append(tokenTypeNames[i]);
}
}
}
spanOffsets++;
return true;
}
#Override
public void close() throws IOException {
super.close();
reset();
}
#Override
public void reset() throws IOException {
super.reset();
this.spanOffsets = 0;
this.spans = null;
}
#Override
public void end() throws IOException {
super.end();
reset();
}
}
here is my test case for following class
#Test
public void testNameFilter() throws IOException {
Reader in = new StringReader(input);
Tokenizer tokenizer = new SentenceTokenizer( detector);
tokenizer.reset();
NameFilter nameFilter = new NameFilter(tokenizer, modelName, nameFinderMES);
nameFilter.reset();
CharTermAttribute charTermAttribute;
PositionIncrementAttribute positionIncrementAttribute;
OffsetAttribute offsetAttribute;
int pass = 0;
while (pass < 2) {
int pos = 0;
int lastStart = 0;
int lastEnd = 0;
//error occur on below invoke
while (nameFilter.incrementToken()) {
}
}
I have added following changes in my code and it work fine but i m now sure it is correct answer
public SentenceTokenizer(Reader reader,SentenceDetector sentenceDetector) {
super();
this.input =reader;
this.sentenceDetector = sentenceDetector;
}
I am a beginner and I am trying to understand what is static, private, public. Please see the following example written by me. It works, but I have very big doubts whether this is a correct way of defining variables and methods. Thanks in advance!
import java.util.Scanner;
import java.util.Date;
import java.text.ParseException;
import java.text.SimpleDateFormat;
public class Biorhytm {
private static String nameOne;
private static String nameTwo;
private static String dobOneIn;
private static String dobTwoIn;
private static Date dobOne;
private static Date dobTwo;
static int diff;
public static Date getDobOne() {
return dobOne;
}
public static void setDobOne(Date dobOne) {
Biorhytm.dobOne = dobOne;
}
public static Date getDobTwo() {
return dobTwo;
}
public static void setDobTwo(Date dobTwo) {
Biorhytm.dobTwo = dobTwo;
}
public static String getDobOneIn() {
return dobOneIn;
}
public static void setDobOneIn(String dobOneIn) {
Biorhytm.dobOneIn = dobOneIn;
}
public static String getDobTwoIn() {
return dobTwoIn;
}
public static void setDobTwoIn(String dobTwoIn) {
Biorhytm.dobTwoIn = dobTwoIn;
}
public static String getNameOne() {
return nameOne;
}
public static void setNameOne(String nameOne) {
Biorhytm.nameOne = nameOne;
}
public static String getNameTwo() {
return nameTwo;
}
public static void setNameTwo(String nameTwo) {
Biorhytm.nameTwo = nameTwo;
}
public static int diffCalc() {
return diff = Math.abs((int)((getDobOne().getTime() - getDobTwo().getTime()) / (24 * 60 * 60 * 1000)));
}
public static void main(String[] args) {
float physicalBio;
float emotionalBio;
float intellectualBio;
boolean validEntry;
Scanner input = new Scanner(System.in);
SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
SimpleDateFormat format2 = new SimpleDateFormat("EEEE, MMMM d, yyyy", java.util.Locale.US);
System.out.println("Enter name of first person!");
setNameOne(input.nextLine());
if (getNameOne().equals("")) {
setNameOne("first person");
}
System.out.println("Enter name of second person!");
setNameTwo(input.nextLine());
if (getNameTwo().equals("")) {
setNameTwo("second person");
}
do {
try {
System.out.println("Enter date of birth of " + getNameOne() + "! (MM/DD/YYYY)");
setDobOneIn(input.nextLine());
setDobOne(format.parse(getDobOneIn()));
validEntry = true;
}
catch (ParseException e) {
validEntry = false;
}
} while (!validEntry);
do {
try {
System.out.println("Enter date of birth of " + getNameTwo() + "! (MM/DD/YYYY)");
setDobTwoIn(input.nextLine());
setDobTwo(format.parse(getDobTwoIn()));
validEntry = true;
}
catch (ParseException e) {
validEntry = false;
}
} while (!validEntry);
System.out.println();
System.out.println("DOB of " + getNameOne() + ": " + format2.format(getDobOne()) + ".");
System.out.println("DOB of " + getNameTwo() + ": " + format2.format(getDobTwo()) + ".");
System.out.println("Difference between DOBs (days): " + diffCalc() + ".");
physicalBio = diffCalc() % 23;
emotionalBio = diffCalc() % 28;
intellectualBio = diffCalc() % 33;
physicalBio /= 23;
emotionalBio /= 28;
intellectualBio /= 33;
if (physicalBio > 0.5) {
physicalBio = 1 - physicalBio;
}
if (emotionalBio > 0.5) {
emotionalBio = 1 - emotionalBio;
}
if (intellectualBio > 0.5) {
intellectualBio = 1 - intellectualBio;
}
physicalBio = 100 - (physicalBio * 100);
emotionalBio = 100 - (emotionalBio * 100);
intellectualBio = 100 - (intellectualBio * 100);
System.out.println("Physical compatibility: " + java.lang.Math.round(physicalBio) + " %.");
System.out.println("Emotional compatibility: " + java.lang.Math.round(emotionalBio) + " %.");
System.out.println("Intellectual compatibility: " + java.lang.Math.round(intellectualBio) + " %.");
}
}
You'd rather have your Biorhythm class be something representing the data about a single person. So you'd create two instances of it (call them "one" and "two", say) and make them non-static. It would have instance variables, not static variables, representing name and date of birth.
class Biorhythm {
private Date dob;
private String name;
Biorhythm(String name, Date dob) {
this.name = name;
this.dob = dob;
}
public String getName() {
return name;
}
public Date getDob() {
return dob;
}
}
public static void main(String[] args) {
Date onedob = /* implementation omitted */
Biorhythm one = new Biorhythm("maxval", onedob);
System.out.println("one: name=" + one.getName() + " date=" + one.getDob());
/* and so forth */
}
You don't really have a need for setXXX() methods because these values aren't probably going to change in your program.
Now create two instances of this class in your main() method. I'll leave the implementation of the calculation methods as an exercise for the time being, since there would be several decent designs for implementing them (in terms of the object-oriented question you asked).
First let me explain what these keywords are-
private,default,protected.public are ACCESS SPECIFIERS.
public-as the word says ,can be accessed everywhere and all members can be public.
protected-can be accessed outside the package in case of inheritance.
default-access able within the package and all members can be default.
private-scope lies within the class,cant be inherited.
And remember these can be used with variables,methods,even classes.
static-can be used when there is no need to invoke methods or access variables with objects.
static members doesn't belong to object and initialised at the time of loading a class.
for ex:
class Converter{
public static long convert(long val){
return val;
}
class User{
long value=Converter.convert(500);//calling convert with class name}