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search for multiple strings from a text file in java

I'm trying to search of multiple words given from a user ( i used array to store them in ) from one txt file , and then if that word presented once in the file it will be displayed and if it's not it won't.
also for the words itself , if it's duplicated it will search it once.
the problem now when i search for only one it worked , but with multiple words it keeps repeated that the word isn't present even if it's there.
i would like to know where should i put the for loop and what's the possible changes.
package search;
import java.io.*;
import java.util.Scanner;
public class Read {
public static void main(String[] args) throws IOException
{
Scanner sc = new Scanner(System.in);
String[] words=null;
FileReader fr = new FileReader("java.txt");
BufferedReader br = new BufferedReader(fr);
String s;
System.out.println("Enter the number of words:");
Integer n = sc.nextInt();
String wordsArray[] = new String[n];
System.out.println("Enter words:");
for(int i=0; i<n; i++)
{
wordsArray[i]=sc.next();
}
for (int i = 0; i <n; i++) {
int count=0; //Intialize the word to zero
while((s=br.readLine())!=null) //Reading Content from the file
{
{
words=s.split(" "); //Split the word using space
for (String word : words)
{
if (word.equals(wordsArray[i])) //Search for the given word
{
count++; //If Present increase the count by one
}
}
if(count == 1)
{
System.out.println(wordsArray[i] + " is unique in file ");
}
else if (count == 0)
{
System.out.println("The given word is not present in the file");
}
else
{
System.out.println("The given word is present in the file more than 1 time");
}
}
}
}
fr.close();
}
}

The code which you wrote is error prone and remember always there should be proper break condition when you use while loop.
Try the following code:
public class Read {
public static void main(String[] args)
{
// Declaring the String
String paragraph = "These words can be searched";
// Declaring a HashMap of <String, Integer>
Map<String, Integer> hashMap = new HashMap<>();
// Splitting the words of string
// and storing them in the array.
String[] words = new String[]{"These", "can", "searched"};
for (String word : words) {
// Asking whether the HashMap contains the
// key or not. Will return null if not.
Integer integer = hashMap.get(word);
if (integer == null)
// Storing the word as key and its
// occurrence as value in the HashMap.
hashMap.put(word, 1);
else {
// Incrementing the value if the word
// is already present in the HashMap.
hashMap.put(word, integer + 1);
}
}
System.out.println(hashMap);
}
}
I've tried by hard coding the values, you can take words and paragraph from the file and console.

The 'proper' class to use for extracting words from text is java.text.BreakIterator
You can try the following (reading line-wise in case of large files)
import java.text.BreakIterator;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Stream;
import java.nio.file.Files;
import java.nio.file.Paths;
public class WordFinder {
public static void main(String[] args) {
try {
if (args.length < 2) {
WordFinder.usage();
System.exit(1);
}
ArrayList<String> argv = new ArrayList<>(Arrays.asList(args));
String path = argv.remove(0);
List<String> found = WordFinder.findWords(Files.lines(Paths.get(path)), argv);
System.out.printf("Found the following word(s) in file at %s%n", path);
System.out.println(found);
} catch (Throwable t) {
t.printStackTrace();
}
}
public static List<String> findWords(Stream<String> lines, ArrayList<String> searchWords) {
List<String> result = new ArrayList<>();
BreakIterator boundary = BreakIterator.getWordInstance();
lines.forEach(line -> {
boundary.setText(line);
int start = boundary.first();
for (int end = boundary.next(); end != BreakIterator.DONE; start = end, end = boundary.next()) {
String candidate = line.substring(start, end);
if (searchWords.contains(candidate)) {
result.add(candidate);
searchWords.remove(candidate);
}
}
});
return result;
}
private static void usage() {
System.err.println("Usage: java WordFinder <Path to input file> <Word 1> [<Word 2> <Word 3>...]");
}
}
Sample run:
goose#t410:/tmp$ echo 'the quick brown fox jumps over the lazy dog' >quick.txt
goose#t410:/tmp$ java WordFinder quick.txt dog goose the did quick over
Found the following word(s) in file at quick.txt
[the, quick, over, dog]
goose#t410:/tmp$

Is there a way for my spellchecker to properly work

The problem is my spellchecker, that I am trying to make. I have a dictionary file that contains large amount of words to compare with the user input so it can detect any possible spelling errors. The problem with mine, is that regardless of what you type it will always say that the spelling is incorrect when it is not. Is there any solution or a better method to detect selling errors of the user input.
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class SpellChecker2 {
public static void main(String[] args) throws FileNotFoundException
{
Scanner input = new Scanner(System.in);
System.out.println("Please enter a String");
String userWord = input.nextLine();
final String theDictionary = "dictionary.txt";
String[] words = dictionary(theDictionary);
boolean correctSpelling = checking(words, userWord);
if (!correctSpelling)
{
System.out.println("Incorrect spelling");
}
else
{
System.out.println("The spelling is correct");
}
}
public static String[] dictionary(String filename) throws FileNotFoundException
{
final String fileName = "dictionary.txt";
Scanner dictionary = new Scanner(new File(fileName));
int dictionaryLength =0;
while (dictionary.hasNext())
{
++dictionaryLength;
dictionary.nextLine();
}
String [] theWords = new String[dictionaryLength];
for ( int x = 0; x < theWords.length ; x++)
dictionary.close();
return theWords;
}
public static boolean checking(String[] dictionary, String userWord)
{
boolean correctSpelling = false;
for ( int i =0; i < dictionary.length; i++)
{
if (userWord.equals(dictionary[i]))
{
correctSpelling = true;
}
else
correctSpelling = false;
}
return correctSpelling;
}
}
The result I get is:
Please enter a String
hello
Incorrect spelling
As you can see the, even though my spelling was correct, it gives an error that the spelling was incorrect. Any help would be great and thank you in advance.

Yes. Return from checking on true. As you have it now, it can only be true if the last word matches. Like,
public static boolean checking(String[] dictionary, String userWord) {
for ( int i =0; i < dictionary.length; i++) {
if (userWord.equals(dictionary[i])) {
return true;
}
}
return false;
}
Also, you need to populate your dictionary by adding words to your array.
And, I would prefer try-with-resources over explicit close() calls. Something like,
public static String[] dictionary(String filename) throws FileNotFoundException {
final String fileName = "dictionary.txt";
int dictionaryLength = 0, i = 0;
try (Scanner dictionary = new Scanner(new File(fileName))) {
while (dictionary.hasNextLine()) {
++dictionaryLength;
dictionary.nextLine();
}
}
String[] theWords = new String[dictionaryLength];
try (Scanner dictionary = new Scanner(new File(fileName))) {
while (dictionary.hasNextLine()) {
theWords[i] = dictionary.nextLine();
i++;
}
}
return theWords;
}

program to remove vowels from a user input and diplay the remaining alphabets in alphabetic order in java

Please help me with the full code modified by someone again. I have tried, but error is coming as StringIndexOutOfBoundsException. I am able to enter just the input from the user.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class RemoveVowels{
public static void main(String []args) {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Sample Program to Remove Vowels");
System.out.println("from a given string \n");
System.out.println("Enter a words : ");
String s = in.readLine();
System.out.println("\n" + "String with Vowels removed : ");
String r = removeVowels(s);
System.out.println(r);
}
private static String removeVowels(String s) {
String finalString = "";
for(int i = 0; i < s.length(); i++) {
if(!isVowel(Character.toLowerCase(s.charAt(i)))) {
finalString = finalString + s.charAt(i);
}
}
return finalString;
}
private static boolean isVowel(char c) {
String vowels = "aeiou";
for(int i = 0; i < 5; i++) {
if(c == vowels.charAt(i))
return true;
}
return false;
}
}

Add throws declaration to the method:
public static void main(String []args) throws IOException
or surround the code with try/catch:
try
{
s = in.readLine();
}
catch (IOException e)
{
e.printStackTrace();
}
You haven't included in your code to sort the string alphabetically, you can do that as follows:
private static String ascending(String s)
{
char[] asc = s.toCharArray();
Arrays.sort(asc);
String sorted = new String(asc);
return sorted;
}
Complete code:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
public class RemoveVowels{
public static void main(String []args) throws IOException
{
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Sample Program to Remove Vowels from a given string \n");
System.out.println("Enter a line : ");
String s=in.readLine();
System.out.println("\n" + "String with Vowels removed : ");
String r=removeVowels(s);
System.out.println(r);
}
private static String removeVowels(String s)
{
String finalString="";
for(int i=0;i<s.length(); i++)
{
if(!isVowel(Character.toLowerCase(s.charAt(i))))
{
finalString=finalString+s.charAt(i);
}
}
finalString= ascending(finalString);
return finalString;
}
private static String ascending(String s)
{
char[] asc = s.toCharArray();
Arrays.sort(asc);
String sorted = new String(asc);
return sorted;
}
private static boolean isVowel(char c)
{
String vowels="aeiou";
for(int i=0; i<5; i++)
{
if(c==vowels.charAt(i))
return true;
}
return false;
}
}

The output is
Sample Program to Remove Vowels
from a given string
Enter a words :
astalavista baby
String with Vowels removed :
stlvst bby
Here is your updated code, you were missing the try catch statement:
package removevowels;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class RemoveVowels {
public static void main(String []args) {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
try {
System.out.println("Sample Program to Remove Vowels");
System.out.println("from a given string \n");
System.out.println("Enter a words : ");
String s = in.readLine();
System.out.println("\n" + "String with Vowels removed : ");
String r = removeVowels(s);
System.out.println(r);
}
catch (IOException ed){}
}
private static String removeVowels(String s) {
String finalString = "";
for (int i = 0;i < s.length(); i++) {
if (!isVowel(Character.toLowerCase(s.charAt(i)))) {
finalString = finalString + s.charAt(i);
}
}
return finalString;
}
private static boolean isVowel(char c) {
String vowels = "aeiou";
for (int i=0; i<5; i++) {
if (c == vowels.charAt(i))
return true;
}
return false;
}
}

Capitalize every word using Scanner(System.in) Java

This code should allow the user to input a sentence, change it to lower case, and then capitalize the first letter of each word. But I can't get the scanner to work, it just prints nothing. Any suggestions?
public class Capitalize
{
public static void capCase(String theString)
{
String source = theString;
StringBuffer res = new StringBuffer();
char[] chars = theString.toLowerCase().toCharArray();
boolean found = false;
for(int i = 0; i<chars.length; i++)
{
if(!found&& Character.isLetter(chars[i])){
chars[i] = Character.toUpperCase(chars[i]);
found = true;
} else if (Character.isWhitespace(chars[i])){
found = true;
}
}
}
public static void main(String[] args)
{
Scanner scanner=new Scanner(System.in);
System.out.println(scanner.next());
}
}

Problems as I see them:
The code as it stands will only print the first word typed in once the user presses enter
The method doesn't return anything, so effectively it does all that work and discards it.
So here is what I might do:
I'm going to put everything in main for the sake of concision
public class Capitalize {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
String sentence = Scanner.nextLine();
StringBuilder ans = new StringBuilder(); // result
for(String s : sentence.split(" ")) { // splits the string at spaces and iterates through the words.
char[] str = s.toLowerCase().toCharArray(); // same as in OPs code
if(str.Length>0) // can happen if there are two spaces in a row I believe
str[0]=Character.toUpperCase(str[0]); // make the first character uppercase
ans.Append(str); // add modified word to the result buffer
ans.Append(' '); // add a space
}
System.out.println(ans);
}
}

You forgot to call the capCase() method, your code only asks for input from stdin and prints it out straight

I tried running the program in main method it runs fine for me. But if you want to get the whole sentence you will have to call scanner like an iterator and then get each next token bu calling scanner.next() method Scanner deliminates words in a sentence on the basis of white spaces. my example implementation is as follows. The you can pass each word in the your function to process it.
`public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
while (scanner.hasNext())
System.out.println(scanner.next());
}`

I would probably do this
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextLine()) { // While there is input.
String line = scanner.nextLine(); // read a line.
int i = 0;
for (String s : line.split(" ")) { // split on space... word(s).
if (i != 0) {
System.out.print(" "); // add a space, except for the first word on a line.
}
System.out.print(capCase(s)); // capCase the word.
i++; // increment our word count.
}
System.out.println(); // add a line.
System.out.flush(); // flush!
}
}
public static String capCase(String theString) {
if (theString == null) {
return ""; // Better safe.
}
StringBuilder sb = new StringBuilder(theString
.trim().toLowerCase()); // lowercase the string.
if (sb.length() > 0) {
char c = sb.charAt(0);
sb.setCharAt(0, Character.toUpperCase(c)); // uppercase the first character.
}
return sb.toString(); // return the word.
}

Problem :
1.you need to send the complete Line and send the String to the function capCase()
2.You are not returning the char array back to the caller.
Solution
1.use the below statement to read complete Line
String str=scanner.nextLine();
2.Change return type of capCase() from void to char[] as below:
public static char[] capCase(String theString)
you should return the char[] variable chars from capCase() function as below:
return chars;
Complete Code:
public static char[] capCase(String theString)
{
String source = theString;
StringBuffer res = new StringBuffer();
char[] chars = theString.toLowerCase().toCharArray();
boolean found = false;
for(int i = 0; i<chars.length; i++)
{
if(!found&& Character.isLetter(chars[i])){
chars[i] = Character.toUpperCase(chars[i]);
found = true;
} else if (Character.isWhitespace(chars[i])){
found = true;
}
}
return chars;
}
public static void main(String[] args)
{
Scanner scanner=new Scanner(System.in);
String str=scanner.nextLine();
System.out.println(capCase(str));
}

Try,
public static void main(String[] args) {
System.out.println(capCase("hello world"));
}
public static String capCase(String theString) {
StringBuilder res = new StringBuilder();
String[] words=theString.split(" +");
for (String word : words) {
char ch=Character.toUpperCase(word.charAt(0));
word=ch+word.substring(1);
res.append(word).append(" ");
}
return res.toString();
}

Try this code it worked for me:
import java.util.Scanner;
public class Capitalize {
/**
* This code should allow the user to input a sentence, change it to lower
* case, and then capitalize the first letter of each word. But I can't get
* the scanner to work, it just prints nothing. Any suggestions?
*
* #param theString
*/
public static void capCase(String theString) {
String source = theString.trim();
StringBuffer res = new StringBuffer();
String lower = theString.toLowerCase();
String[] split = lower.split(" ");
for (int i = 0; i < split.length; i++) {
String temp = split[i].trim();
if (temp.matches("^[a-zA-Z]+")) {
split[i] = temp.substring(0, 1).toUpperCase()
+ temp.substring(1);
}
res.append(split[i] + " ");
}
System.out.println(res.toString());
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
capCase(scanner.nextLine());
// System.out.println(scanner.next());
}
}

I've tested it. It works.
import java.util.Scanner;
import org.apache.commons.lang3.text.WordUtils;
public class Capitalize {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
while(s.hasNextLine()) {
System.out.println(WordUtils.capitalize(s.nextLine()));
}
}
}

How to reverse words of a Java String

Im trying to make a program to take input for a string from the scanner, but i want to break up the string that was inputed and reverse the order of words. This is what i have so far.
Scanner input = new Scanner(System.in);
System.out.println("Enter your string");
StringBuilder welcome = new StringBuilder(input.next());
int i;
for( i = 0; i < welcome.length(); i++ ){
// Will recognize a space in words
if(Character.isWhitespace(welcome.charAt(i))) {
Character a = welcome.charAt(i);
}
}
What I want to do is after it recognizes the space, capture everything before it and so on for every space, then rearrange the string.

Edit after questions.
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
public class Main {
public static void main( String[] args ) {
final String welcome = "How should we get words in string form a List?";
final List< String > words = Arrays.asList( welcome.split( "\\s" ));
Collections.reverse( words );
final String rev = words.stream().collect( Collectors.joining( ", " ));
System.out.println( "Your sentence, reversed: " + rev );
}
}
Execution:
Your sentence, reversed: List?, a, form, string, in, words, get, we, should, How

I did suggest first reverse the whole string.
Then reverse the substring between two spaces.
public class ReverseByWord {
public static String reversePart (String in){
// Reverses the complete string
String reversed = "";
for (int i=0; i<in.length(); i++){
reversed=in.charAt(i)+reversed;
}
return reversed;
}
public static String reverseByWord (String in){
// First reverses the complete string
// "I am going there" becomes "ereht gniog ma I"
// After that we just need to reverse each word.
String reversed = reversePart(in);
String word_reversal="";
int last_space=-1;
int j=0;
while (j<in.length()){
if (reversed.charAt(j)==' '){
word_reversal=word_reversal+reversePart(reversed.substring(last_space+1, j));
word_reversal=word_reversal+" ";
last_space=j;
}
j++;
}
word_reversal=word_reversal+reversePart(reversed.substring(last_space+1, in.length()));
return word_reversal;
}
public static void main(String[] args) {
// TODO code application logic here
System.out.println(reverseByWord("I am going there"));
}
}

Here is the way you can reversed the word in entered string:
Scanner input = new Scanner(System.in);
System.out.println("Enter your string");
String s = input.next();
if(!s.trim().contains(' ')) {
return s;
}
else {
StringBuilder reversedString = new StringBuilder();
String[] sa = s.trim().split(' ');
for(int i = sa.length() - 1; i >= 0: i - 1 ) {
reversedString.append(sa[i]);
reversedString.append(' ');
}
return reversedString.toString().trim();
}
Hope this helps.

If you wanted to reduce the number of line of code, I think you can look into my code :
package com.sujit;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class StatementReverse {
public static void main(String[] args) throws IOException {
String str;
String arr[];
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter a string:");
str = br.readLine();
arr = str.split("\\s+");
for (int i = arr.length - 1;; i--) {
if (i >= 0) {
System.out.print(arr[i] + " ");
} else {
break;
}
}
}
}

public class StringReverse {
public static void main(String[] args) {
String str="This is anil thakur";
String[] arr=str.split(" ");
StringBuilder builder=new StringBuilder("");
for(int i=arr.length-1; i>=0;i--){
builder.append(arr[i]+" ");
}
System.out.println(builder.toString());
}
}
Output: thakur anil is This

public class ReverseWordTest {
public static String charRev(String str) {
String revString = "";
String[] wordSplit = str.split(" ");
for (int i = 0; i < wordSplit.length; i++) {
String revWord = "";
String s2 = wordSplit[i];
for (int j = s2.length() - 1; j >= 0; j--) {
revWord = revWord + s2.charAt(j);
}
revString = revString + revWord + " ";
}
return revString;
}
public static void main(String[] args) {
System.out.println("Enter Your String: ");
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
System.out.println(charRev(str));
}

public static void main(String[]args)
{
String one="Hello my friend, another way here";
String[]x=one.split(" ");
one="";
int count=0;
for(String s:x){
if(count==0||count==x.length) //that's for two edges.
one=s+one;
else
one=s+" "+one;
count++;
}
System.out.println(one); //reverse.
}