#Java - Code Snippets for '#String'

#Java - Code Snippets for '#String' - 50 code snippet(s) found

Sample 1. Tricky code for String Comparison and String Pool

class BuggyBread { 

   public static void main(String[] args)

   {

      String s2 = "I am unique!"; 

      String s5 = "I am unique!";

        

      System.out.println(s2 == s5); // prints true

   } 

}

_{Like Feedback tricky code example string string comparison object comparison object equality string equality string pool}

Sample 2. Write a Program to reverse a string iteratively and recursively

Using String method -



new StringBuffer(str).reverse().toString();



Iterative -



Strategy - Loop through each character of a String from last to first and append the character to StringBuilder / StringBuffer



public static String getReverseString(String str){

   StringBuffer strBuffer = new StringBuffer(str.length);

   for(int counter=str.length -1 ; counter>=0;counter--){

      strBuffer.append(str.charAt(counter));

   } 

   return strBuffer;

}



Recursive -



Strategy - Call the method with substring starting from 2nd character recursively till we have just 1 character. 



public static String getReverseString(String str){

   if(str.length <= 1){

      return str;

   }

   return (getReverseString(str.subString(1)) +      str.charAt(0);

}

_{Like Feedback string StringBuffer recursion for loop control statements loop statement stringbuffer.append java.lang.String java.lang.StringBuffer String Manipulation}

Sample 3. Given a Map with Country Name as key and its capitals as values, Find the name of countries having more than 1 capital ?

Map<String,List<String>> capitals = new HashMap();

capitals.put("United States", Arrays.asList("Washington DC"));

capitals.put("Canada", Arrays.asList("Ottawa"));

capitals.put("South Africa", Arrays.asList("Pretoria", "Cape Down", "Bloemfontein"));

      

for(Map.Entry<String,List<String>> entry: capitals.entrySet()){

   if(entry.getValue().size() > 1){

      System.out.println(entry.getKey());

   }

}

_{Like Feedback Map of String and List}

Sample 4. Check if the string is empty using Spring StringUtils

String str = "";

if(StringUtils.isEmpty(str)){

    System.out.println("Yes, string is empty");

}

_{Like Feedback StringUtils StringUtils.isEmpty}

Sample 5. Using Pojomatic for overriding equals,hashcode and toString methods

import org.pojomatic.Pojomatic;

import org.pojomatic.annotations.AutoProperty;



@AutoProperty

public class Employee {

   public String name;

   public int age;

   public int salary;



   public String getName() {

      return name;

   }



   public void setName(String name) {

      this.name = name;

   }



   public int getAge() {

      return age;

   }



   public void setAge(int age) {

      this.age = age;

   }



   public int getSalary() {

      return salary;

   }



   public void setSalary(int salary) {

      this.salary = salary;

   }



   @Override

   public int hashCode() {

      return Pojomatic.hashCode(this);

   }



   @Override

   public boolean equals(Object other) {

      return Pojomatic.equals(this, other);

   }



   @Override

   public String toString() {

      return Pojomatic.toString(this);

   }

}

_{Like Feedback pojomatic toString method toString hashcode method equals method overrding equals method overriding hashcode method overrding tostring method @autoproperty pojomatic autoproperty}

Sample 6. Code Sample / Example / Snippet of java.text.StringCharacterIterator

    public static String encode(String source) {

        if (source == null) {

            return "$e";

        }

        StringBuffer result = new StringBuffer();

        StringCharacterIterator sci = new StringCharacterIterator(source);

        for (char c = sci.current(); c != CharacterIterator.DONE; c = sci.next()) {

            if (c == '$') {

                result.append("$$");

            }

            else if (c == ',') {

                result.append("$k");

            }

            else if (c == '
') {

                result.append("$n");

            }

            else if (c == '
') {

                result.append("$r");

            }

            else {

                result.append(c);

            }

        }

        return result.toString();

    }

_{Like Feedback java.text.StringCharacterIterator}

Sample 7. Remove Numbers from a String using CharSetUtils (Apache Commons)

String str = new String("1H4ello1 World2"); 



String newStr = CharSetUtils.delete(str, "1234567890");



System.out.println(newStr); // prints Hello World

_{Like Feedback Apache Commons CharSetUtils Remove Numbers from String}

Sample 8. Concatenate Strings

String str = new String().concat("Explain").concat("This").concat("Code");

_{Like Feedback string string concatenation concat}

Sample 9. Code to find email ids in a string using Pattern.

String text="vivek boy goy vivek@tech.com viv@ek.com sdjs@adjk";

Pattern regex = Pattern.compile("[@]");

Matcher regexMatcher = regex.matcher(text);

int i =0;

int width = 0;

while (regexMatcher.find()) {

     if((regexMatcher.start()-10 > 0) && (regexMatcher.end()+10 < text.length())){

          width=10;

       String[]    substr=text.substring(regexMatcher.start()-width,regexMatcher.end()+width).split(" ");

           for(int j=0;j<substr.length;j++){

                   if(substr[j].contains("@") && (substr[j].contains(".com") ||    substr[j].contains(".net"))){

                                System.out.println(substr[j]);

                           }                

                     }

               } else {

               width=0;

        }

 }

_{Like Feedback regex pattern string regexMatcher.find java.util.regex.Matcher java.util.regex.Pattern}

Sample 10. Get the subString from a String using the begin and end index

String text = "I don't think we're in Kansas anymore";



// Usage string.substring(startIndex,endIndex)



String subStringText = text.substring(0,2);



System.out.println(subStringText); // prints I d

_{Like Feedback string substring substring using indices}

Sample 11. Get all words from a String and display them

String string = "I don't think we are in Kansas anymore";

String splittedString = str1.split(" ");

int count = 1;

for(String str: splittedString){

   System.out.println("Word number:" + count + ":" + str);

   count++;

}

_{Like Feedback string string split Get all words from a String word count}

Sample 12. Method to remove duplicates from a Map ( string and List of objects ) by matching the member field of the object.

Map<String,List<ClassInfoBean>> removeDuplicates(Map<String, List<ClassInfoBean>> interfaceMap){

   Map<String, List<ClassInfoBean>> interfaceMapWithoutDuplicate = new HashMap();

      

   for(Map.Entry<String, List<ClassInfoBean>> entry: interfaceMap.entrySet()){

      List<ClassInfoBean> classListWithoutDuplicate = new ArrayList();

      boolean alreadyContain = false;

      for(ClassInfoBean classes: entry.getValue()){

         for(ClassInfoBean classes1: classListWithoutDuplicate){

            if(classes1.name.equalsIgnoreCase(classes.name)){

               alreadyContain = true;

               break;

            }

         }

         if(alreadyContain == false){

            classListWithoutDuplicate.add(classes);

         }

      }

      interfaceMapWithoutDuplicate.put(entry.getKey(), classListWithoutDuplicate);

   }

      

   return interfaceMapWithoutDuplicate;

}

_{Like Feedback map map of list of objects remove duplicates from map Map.Entry}

Sample 13. Write a Program to print ascii value of each character of a string

public static void main(String[] args) {

      String str = "We are not in Kansas anymore";

      for(char character: str.toCharArray()){

         System.out.println((int)character);

      }

}

_{Like Feedback ascii character}

Sample 14. Method to check if input String is Palindrome

private static boolean isPalindrome(String str) {

   if (str == null)

      return false;

   StringBuilder strBuilder = new StringBuilder(str);

   strBuilder.reverse();

   return strBuilder.toString().equals(str);

}

_{Like Feedback Palindrome strBuilder.reverse string stringbuilder.reverse java.lang.StringBuilder}

Sample 15. Method that will remove given character from the String

private static String removeChar(String str, char c) {

  if (str == null)

  return null;

  return str.replaceAll(Character.toString(c), "");

}

_{Like Feedback string string.replaceall Character.toString}

Sample 16. Get the content of a file in a string

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;



public class FileToString {



     public static void main(String[] args) throws IOException {



        String line = null;



        String wholePage = "";



        FileReader fileReader =

              new FileReader("/home/vivekvermani/test.txt");



          BufferedReader bufferedReader =

              new BufferedReader(fileReader);



          while((line = bufferedReader.readLine()) != null) {

             wholePage = wholePage + line + "

";

          }



          bufferedReader.close();



        System.out.println(wholePage);

     }

}

_{Like Feedback reading file to string import}

Sample 17. Replace all occurrences of a character or substring in a string

String myString = new String("Nevada,Kansas,Georgia");



myString = myString.replaceAll(",", " ");



System.out.println(myString); // prints Nevada Kansas Georgia

_{Like Feedback string substring replaceAll}

Sample 18. Check if a string contains a substring.

String text = "I don't think we're in Kansas anymore";



if(text.indexOf("Kansas") != -1){

    System.out.println("Yes, the dialog contains Kansas");

}

_{Like Feedback string substring indexOf()}

Sample 19. Trim New line and spaces in a string

String trimNewLineAndSpace(String str){

   str = str.trim();

   if(str.startsWith("\n")){

      str = str.substring(1);

   }

      

   if(str.endsWith("\n")){

      str = str.substring(0, str.length()-1);

   }

   return str;

}

_{Like Feedback string trim new lines string.substring string.startswith string.endswith}

Sample 20. Trim a String till first capital character.

String trimTillFirstCapitalCharacter(String str){

   for(int i=0;i<str.length();i++){

      if(str.charAt(i) != str.toLowerCase().charAt(i)){

         return str.substring(i);

      }

   }

   return str;

}

_{Like Feedback trim characters trim}

Sample 21. Trim square braces and spaces from a String

String trimSquareBracesAndSpaces(String str){

   str = str.trim();

   if(str.startsWith("[")){

      str = str.substring(1);

   }

      

   if(str.endsWith("]")){

      str = str.substring(0, str.length()-1);

   }

   return str;

}

_{Like Feedback string string trim trim}

Sample 22. Remove templatized arguments from a String

String removeTemplatizedArgument(String str){

   String cleanStr = "";

   boolean withinTemplatized=false;   

   int countBlock = 0;

   for(char x: str.toCharArray()){

      if(x == '<'){

         withinTemplatized = true;

         countBlock++;

         continue;

      } else if(x == '>'){

         withinTemplatized = false;

         countBlock--;

         continue;

      } else if(!withinTemplatized && countBlock == 0){

         cleanStr = cleanStr + x;

      }

         

   }

      

   return cleanStr;

}

_{Like Feedback string string trim trim char .toCharArray()}

Sample 23. Remove Alien characters i.e removing everything except characters , numbers and special characters.

String removeAlienCharacters(String str){

   String newString = new String();

   String returnString = "";

   if(str.contains("<")){

      String[] str2 = str.split("<");

      str = str2[0];

   }

      

   for(char x: str.toCharArray()){

      if((x >= 48 && x <= 57) || (x>=65 && x <= 90) || (x >= 97 && x<= 122) || x=='.'){

         returnString += x;

      }

   }

   return returnString.trim();

}

_{Like Feedback string .contains() .split() string split string contains remove characters from string remove alien characters}

Sample 24. Method to convert all elements of a collection ( Set ) to lower case.

Set<String> convertLowerCase(Set<String> set){

   Set<String> newSet = new HashSet();

   for(String s: set){

      newSet.add(s.toLowerCase());

   }

      

   return newSet;

}

_{Like Feedback string collections set .tolowercase()}

Sample 25. Usage of StringBuffer

StringBuffer strBuffer = new StringBuffer();

strBuffer.append("I don't think");

strBuffer.sppend("we're in Kansas anymore");

String string = strBuffer.toString();

_{Like Feedback stringbuffer}

Sample 26. Method to get a map of words and their count by passing in the string

Map<String,Integer> wordCountMap = new TreeMap();

          String[] words = text.split(" ");

          Set<Integer> countSet;

          for(String word: words) {

              if(wordCountMap.containsKey(word.toLowerCase())){

                  wordCountMap.put(word.toLowerCase(), wordCountMap.get(word.toLowerCase()).intValue() + 1);

              } else {

                  wordCountMap.put(word.toLowerCase(), 1);

              }

          }



          countSet = new TreeSet(Collections.reverseOrder());

          countSet.addAll(wordCountMap.values());



          for(Integer inte: countSet) {

             for(Entry<String,Integer> entry: wordCountMap.entrySet()){

                if(entry.getValue() == inte) {

                    System.out.println(entry);

                }

             }

          }

_{Like Feedback map word count map of string and integer containsKey string split treeset Collections.reverseOrder set addAll entry}

Sample 27. Initialize Date using SimpleDateFormat and parsing string

Date endDate = new SimpleDateFormat("yyyyMMdd").parse("20160426");

_{Like Feedback SimpleDateFormat Date SimpleDateFormat.parse java.text.SimpleDateFormat}

Sample 28. Null or Empty String check using string length

String str= "";



if (str != null || str.length() != 0) {

   // Do something

}

_{Like Feedback string null check String.length check empty string}

Sample 29. Find shortest and longest word in a string

public static void main(String[] args) {

      String str = "We are not in Kansas anymore";

      String shortestWord = "";

      String longestWord = "";

      int shortestWordLength = 1000;

      int longestWordLength = 0;

      String[] splitStr = str.split(" ");

      for(String string: splitStr){

         if(string.length() > longestWordLength){

            longestWord = string;

            longestWordLength = string.length();

         } else if(string.length() < shortestWordLength){

            shortestWord = string;

            shortestWordLength = string.length();

         }

      }

      

      System.out.println("Shortest Word :" + shortestWord);

      System.out.println("Longest Word :" + longestWord);

}

_{Like Feedback string string.split}

Sample 30. Copy Array using System.arraycopy

String[] stringArray = new String[50];

String[] newStringArray = new String[50];

System.arraycopy(stringArray, 0, newStringArray, 0, 50); //arrayCopy(src,srcPosition,destination,destinationPos,length)

_{Like Feedback System.arraycopy Copy array arrays array of string}

Sample 31. Repeat a string using Google Guava Strings Class

System.out.println(Strings.repeat("Hello", 5));

_{Like Feedback google guava google guava string strings.repeat repeat characters repeat string}

Sample 32. Convert int to String

int x = 5;

String.valueOf(x);

_{Like Feedback String String.valueOf int to String}

Sample 33. Usage of Apache Commons CharSet

String str = new String("Hello World");

CharSet charSet = CharSet.getInstance(str);

System.out.println(charSet.contains('W')); // prints true

System.out.println(charSet.contains('w')); // prints false

_{Like Feedback CharSet Apache Commons CharSet Example CharSet Sample String characters}

Sample 34. Remove characters from the String using CharSetUtils

String str = new String("Hello World"); 

String newStr = CharSetUtils.delete(str, "abcde");

System.out.println(newStr); // prints Hllo Worl

_{Like Feedback Remove characters from the String String CharSetUtils Apache Commons}

Sample 35. Remove special characters from a String using CharSetUtils ( Apache Commons )

String str = new String("What's Up ?"); 



String newStr = CharSetUtils.delete(str, "'?");



System.out.println(newStr); // prints Whats Up

_{Like Feedback Apache Commons CharSetUtils Remove characters from String}

Sample 36. Check if the String contains specified characters using CharSetUtils (Apache Commons)

System.out.println(CharSetUtils.containsAny("Whats Up ?", "W")); // Prints true as the String contains character W  System.out.println(CharSetUtils.containsAny("Whats Up ?", "YZ")); // Prints false as the String doesn't contain character Y or Z

_{Like Feedback CharSetUtils (Apache Commons) Check if String contains characters}

Sample 37. Print the characters that exist in the specified String using CharSetUtils ( Apache Commons )

System.out.println(CharSetUtils.keep("Whats Up ?", "Watch")); // Prints Wat as only those characters matches in the String

_{Like Feedback Characters that exist in String CharSetUtils ( Apache Commons )}

Sample 38. Get Length of String having UTF8 Characters

public static int utf8Length(String string) {

   CharacterIterator iter = new StringCharacterIterator(string);

   char ch = iter.first();

   int size = 0;

   while (ch != CharacterIterator.DONE) {

      if ((ch >= 0xD800) && (ch < 0xDC00)) {

         char trail = iter.next();

         if ((trail > 0xDBFF) && (trail < 0xE000)) {

            size += 4;

         } else {

            size += 3;

            iter.previous(); // rewind one

         }

      } else if (ch < 0x80) {

         size++;

      } else if (ch < 0x800) {

         size += 2;

      } else {

         size += 3;

      }

      ch = iter.next();

   }

   return size;

}

_{Like Feedback UTF8 characters CharacterIterator.DONE CharacterIterator StringCharacterIterator}

Sample 39. Count Occurences of substring in a String using StringUtils ( Apache Commons )

if(StringUtils.countMatches(snippet, "{") == StringUtils.countMatches(snippet, "}")){

         System.out.println("Yes a Valid Code Snippet");

      }

_{Like Feedback StringUtils Apache Commons Count Occurences of substring}

Sample 40. Code Sample / Example / Snippet of java.util.StringTokenizer

  public static List<String> getNamedOutputsList(JobConf conf) {

    List<String> names = new ArrayList<String>();

    StringTokenizer st = new StringTokenizer(conf.get(NAMED_OUTPUTS, ""), " ");

    while (st.hasMoreTokens()) {

      names.add(st.nextToken());

    }

    return names;

  }

_{Like Feedback java.util.StringTokenizer}

Sample 41. Code Sample / Example / Snippet of java.io.StringWriter

  public Fluent returns(Function<String, Void> checker) throws ParseException {

    final Ast.Program program = parseProgram(pig);

    final PigRelBuilder builder =

        PigRelBuilder.create(PigRelBuilderTest.config().build());

    final StringWriter sw = new StringWriter();

    new CalciteHandler(builder, sw).handle(program);

    checker.apply(Util.toLinux(sw.toString()));

    return this;

  }

_{Like Feedback java.io.StringWriter}

Sample 42. Code Sample / Example / Snippet of java.util.StringTokenizer

    private List<String> tokenize(String s) {

      List<String> result = new ArrayList<>();

      StringTokenizer tokenizer = new StringTokenizer(s);

      while (tokenizer.hasMoreTokens()) {

        result.add(tokenizer.nextToken());

      }

      return result;

    }

_{Like Feedback java.util.StringTokenizer}

Sample 43. Code Sample / Example / Snippet of org.apache.calcite.avatica.util.ByteString

  private void thereAndBack(byte[] bytes) {

    final ByteString byteString = new ByteString(bytes);

    final byte[] bytes2 = byteString.getBytes();

    assertThat(bytes, equalTo(bytes2));



    final String base64String = byteString.toBase64String();

    final ByteString byteString1 = ByteString.ofBase64(base64String);

    assertThat(byteString, equalTo(byteString1));

  }

_{Like Feedback org.apache.calcite.avatica.util.ByteString}

Sample 44. Code Sample / Example / Snippet of java.util.StringTokenizer

	public LowestID(String representation) {

        try {

            StringTokenizer st = new StringTokenizer(representation, ",");

            m_targetID = Codec.decode(st.nextToken());

            m_storeID = Long.parseLong(st.nextToken());

            m_lowestID = Long.parseLong(st.nextToken());

        }

        catch (NoSuchElementException e) {

            throw new IllegalArgumentException("Could not create lowest ID object from: " + representation);

        }

	}

_{Like Feedback java.util.StringTokenizer}

Sample 45. Code Sample / Example / Snippet of org.apache.bcel.classfile.ConstantString

    public String stringifyValue()

    {

        final ConstantUtf8 cu8 = (ConstantUtf8) getConstantPool().getConstant(valueIdx);

        return cu8.getBytes();

    }

_{Like Feedback org.apache.bcel.classfile.ConstantString}

Sample 46. Write CSV values to a file using au.com.bytecode.opencsv.CSVWriter

String[] stringArray1 = new String[5];

String[] stringArray2 = new String[5];

String[] stringArray3 = new String[5];



List listOfStringArrays = new ArrayList();

listOfStringArrays.add(stringArray1);

listOfStringArrays.add(stringArray2);

listOfStringArrays.add(stringArray3);



File file = new File("BuggyBread.txt");

CSVWriter csvWriter = null;

try {

   csvWriter = new CSVWriter(new FileWriter(file),CSVWriter.DEFAULT_SEPARATOR);

} catch (Exception ex){

}

csvWriter.writeAll(listOfStringArrays);

_{Like Feedback array of Strings csv writer}

Sample 47. Write a program / method to print first letter of words in a string.

public void printFirstLetterOfWords(String str){

   String[] splittedStringArray = str.split(" ");

   for(String word:splittedStringArray){

      System.out.println(word.charAt(0));

   }

}

_{Like Feedback Code Coding String}

Sample 48. Print duplicate characters in a string / char array without using library

public class CountDuplicates {

   public static void main(String[] args){

      char[] alreadyOccured = new char[10];

      

      char[] charArray = {'b','u','g','g','y','b','r','e','a','d'};

      

      for(int countArray=0;countArray<charArray.length;countArray++){

         boolean charAlreadyOccured = false;

         for(int countAlreadyOccured=0;countAlreadyOccured<alreadyOccured.length;countAlreadyOccured++){

            if(charArray[countArray] == alreadyOccured[countAlreadyOccured]){

               charAlreadyOccured = true;

               break;

            }

         }

         if(charAlreadyOccured){

            System.out.println(charArray[countArray]);

         } else {

            alreadyOccured[countArray] = charArray[countArray]; 

         }

      }

   }

}

_{Like Feedback string char array}

Sample 49. Write a Program to replace characters in a String ( without using String replace method )

public class ReplaceCharacters{

   public static void main(String[] args){

      String str = "Hello BuggyBread";

      

      char[] charArray = str.toCharArray();

      int countCharacter = str.length();

      for(int count=0;count<countCharacter;count++){

         if(charArray[count] == 'g'){

            charArray[count] = 'd';

         }

      }

      String replacedString = new String(charArray).toString();

      

      System.out.println(replacedString);

   }

}

_{Like Feedback string replace characters in a string}

Sample 50. Write a Program to right shift single character in a string

public class RightShiftCharacter {

   public static void main(String args[]) {

      String str = "Hello";

      

      char[] charArray = str.toCharArray();

      

      for(int count=charArray.length-1;count>0;count--){

         charArray[count] = charArray[count-1];

      }

      

      String newString = new StringBuilder().append(charArray).toString();

      

      System.out.println(newString);        

   }

}

_{Like Feedback string manipulation.right shift character}

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