How to convert String to String array in Java

A String in Java is a thing that indicates a collection of letters. We must include the String class from java.lang package if we want to be using strings. An array containing strings with such a set length is indeed the String array. For converting a String to a String array, there are 5 methods.

Example:

Input: String=“Om Ram”

Output:String[]=[Om,Ram]

Here are some of them:

1. Using the String.split() function
2. creating loops
3. Employing the Set.toArray() method
4. Applying the String tokenizer
5. Using the Pattern.split() method

Method 1: Using the String.split() function

Approach:

1. Create a string-typed array.
2. String array for splitting an array.
3. String name.split() can be used to divide the provided string . 
4. Should print the divided string array.

StringArr.java

// This program is for converting the string to a String array
// by using the str.split() method
// import section
import java.io.*;
// Main section
public class StringArr {
 // Main method of the program
 public static void main(String[] args)
 {
  // Given input string to convert to string array
  String st = "Java Programming Language";


  String stArray[] = st.split(" ");


  System.out.println("Given String is: " + st);
  System.out.println("Converted String array : [ ");


  // Iterating over the string
  for (int i = 0; i < stArray.length; i++) {
   // The array of elements is printed
   System.out.print(stArray[i] + ", ");
  }


  System.out.print("]");
 }
}

Output:

Method 2: By using the loops

ArrayHash.java

//  This program is for converting the string to a String array
// by using the HashSet and the set classes
// import section
import java.io.*;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;


// Main section
public class ArrayHash{
 // 1st method
 // converting string to string[] array
 public static String[] method(Set<String> string)
 {
  // Create String[] of size of setOfString
  String[] stringarray = new String[string.size()];


  //elements are copied to set array
  //by using the for loop
  int position = 0;
  for (String st: string) {
   stringarray[position++] = st;
  }


  // returning the formed character array
  return stringarray;
 }


 // 2nd Method
 // Main method
 public static void main(String[] args)
 {
  // user input
  String st= "Java Programming language";


  // object set_String is created
  Set<String> set_string
   = new HashSet<>(Arrays.asList(st));


  // Printing the setOfString
  System.out.println("The given String is: " + st);


  // the set is converted to a string array
  String[] Stringarray = method(set_string);


  // printing the array consisting of strings
  // by using the arrays.toString() method
  System.out.println("The String array is: "
      + Arrays.toString(Stringarray));
 }
}

Output:

3. Using the Set.toArray() method

Approach:

1. Transform the provided string into a group of strings.
2. Make a blank string array now.
3. By giving a blank array of the integer type to set.toArray(), you may transform the string set to an array of strings.
4. Display the string array.

Example: Stringarr.java

//This program is for converting the string to string array
//By using the method Set.toArray() 
//import section
import java.io.*;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
// Main section
public class Stringarr {
 // 1 st Method
 // to convert the string to string array
 public static String[] convert(Set<String> setOfString)
 {
  // a string String[] is created
  String[] arrayString  = setOfString.toArray(new String[0]);
  // returning the resultant string
  return arrayString;
 }
 // 2 Method
 //Main Method
 public static void main(String[] args)
 {
  //creating the string 
  String st = "Java Programming language";
  //Set of string
  Set<String> strings
   = new HashSet<>(Arrays.asList(st));
  //printing the string
  System.out.println("Given String: " + st);


  // Converting Set to String array
  String[] stringarray = convert(strings);
  // Print the arrayOfString In the print statement
  // the method is used (Arrys.toString())
  System.out.println("The converted String array : "
      + Arrays.toString(stringarray));
 }
}

Output:

4. Using a string tokenizer

A string tokenizer is a tool that breaks up a string object into progressively smaller pieces. Tokens refer to these more compact components.

1. Tokenize the supplied string.
2. Make a type string array with the token counts' sizes in it.
3. Should save these tokens in a string array.
4. Displaying the string array in the print statement.

Example: StringToken.java

// This program is for converting the string to a String array
// by using the string tokenizer class
// importing the required packages
import java.io.*;
import java.util.StringTokenizer;
// Main section of the program
public class StringToken {
 // Main method of the class 
 public static void main(String[] args)
 {
  // the integer value iss declared
  // to 0
  int i = 0;
  // giving the user input
  String st = "Java Programming Language";
  // the string is divided into tokens
  // using the delimiter
  StringTokenizer strtokenizer
   = new StringTokenizer(st);
  String[] stringarray
   = new String[strtokenizer.countTokens()];
  // the tokens are appended to the array
  while (strtokenizer.hasMoreTokens()) {
   stringarray[i] = strtokenizer.nextToken();
   i++;
  }
  //printing the given string
  System.out.print("The given String :" + st);
  // displaying the string array
  System.out.print("\nThe String array is  : [ ");
  // the string array is printed
  // by using the loos
  for (String s: stringarray) {
   System.out.print(s + " ");
  }
  System.out.print("]");
 }
}

Output:

5. Method of using the pattern.split() function.

Using the split() function, a provided text is divided into an array by a predefined pattern. By providing a certain pattern, we may divide our string. 

Approach:

1. Create a pattern (REGEX)
2. Then use the compilation technique to make a pattern.
3. Then divide the string utilizing the pattern.
4. Use split() using a particular pattern and save the results in the array.
5. Print the array of strings

PatternSplit.java

// This program is for converting the string to a String array
// by using the pattern.split() method
// importing the required packages
import java.io.*;
import java.util.regex.Pattern;
// Main section
public class PatternSplit {
// Main method of the program
public static void main(String[] args)
{
// user input as the string
String s = "Java Programming Language";


// Step:1 defining the re expression
String mypattern = "\\s";


// Step2:The pattern is created by using the compile method
Pattern patt = Pattern.compile(mypattern);


// Step 3:The arry is created by using the declared pattern in above
String[] stringarray = patt.split(s);


// Printing the given string
// and also it's converted array
System.out.print("The given String is : " + s);
System.out.print("\nThe String array is : [ ");


// The String iterated using the for loop
for (int i = 0; i < stringarray.length; i++) {
// the Stringarray is printed
System.out.print(stringarray[i] + " ");
}


System.out.print("]");
}
}

Output: