I have a string = "name";I want to convert into a string array.
How do I do it?
Is there any java built in function? Manually I can do it but I'm searching for a java built in function.
I want an array where each character of the string will be a string. like char 'n' will be now string "n" stored in an array.
315 Answers
To start you off on your assignment, String.split splits strings on a regular expression and this expression may be an empty string:
String[] ary = "abc".split("");Yields the array:
(java.lang.String[]) [, a, b, c]Getting rid of the empty 1st entry is left as an exercise for the reader :-)
Note: In Java 8, the empty first element is no longer included.
0String strName = "name";
String[] strArray = new String[] {strName};
System.out.println(strArray[0]); //prints "name"The second line allocates a String array with the length of 1. Note that you don't need to specify a length yourself, such as:
String[] strArray = new String[1];instead, the length is determined by the number of elements in the initalizer. Using
String[] strArray = new String[] {strName, "name1", "name2"};creates an array with a length of 3.
2Assuming you really want an array of single-character strings (not a char[] or Character[])
1. Using a regex:
public static String[] singleChars(String s) { return s.split("(?!^)");
}The zero width negative lookahead prevents the pattern matching at the start of the input, so you don't get a leading empty string.
2. Using Guava:
import java.util.List;
import org.apache.commons.lang.ArrayUtils;
import com.google.common.base.Functions;
import com.google.common.collect.Lists;
import com.google.common.primitives.Chars;
// ...
public static String[] singleChars(String s) { return Lists.transform(Chars.asList(s.toCharArray()), Functions.toStringFunction()) .toArray(ArrayUtils.EMPTY_STRING_ARRAY);
}I guess there is simply no need for it, as it won't get more simple than
String[] array = {"name"};Of course if you insist, you could write:
static String[] convert(String... array) { return array;
}
String[] array = convert("name","age","hobby"); [Edit] If you want single-letter Strings, you can use:
String[] s = "name".split("");Unfortunately s[0] will be empty, but after this the letters n,a,m,e will follow. If this is a problem, you can use e.g. System.arrayCopy in order to get rid of the first array entry.
4In java 8, there is a method with which you can do this: toCharArray():
String k = "abcdef";
char[] x = k.toCharArray();This results to the following array:
[a,b,c,d,e,f]String data = "abc";
String[] arr = explode(data);
public String[] explode(String s) { String[] arr = new String[s.length]; for(int i = 0; i < s.length; i++) { arr[i] = String.valueOf(s.charAt(i)); } return arr;
}Simply use the .toCharArray() method in Java:
String k = "abc";
char[] alpha = k.toCharArray();This should work just fine in Java 8.
String array = array of characters ?
Or do you have a string with multiple words each of which should be an array element ?
String[] array = yourString.split(wordSeparator);
Convert it to type Char?
You could use string.chars().mapToObj(e -> new String(new char[] {e}));, though this is quite lengthy and only works with java 8. Here are a few more methods:
string.split(""); (Has an extra whitespace character at the beginning of the array if used before Java 8)string.split("|");string.split("(?!^)");Arrays.toString(string.toCharArray()).substring(1, string.length() * 3 + 1).split(", ");
The last one is just unnecessarily long, it's just for fun!
An additional method:
As was already mentioned, you could convert the original String "name" to a char array quite easily:
String originalString = "name";
char[] charArray = originalString.toCharArray();To continue this train of thought, you could then convert the char array to a String array:
String[] stringArray = new String[charArray.length];
for (int i = 0; i < charArray.length; i++){ stringArray[i] = String.valueOf(charArray[i]);
}At this point, your stringArray will be filled with the original values from your original string "name". For example, now calling
System.out.println(stringArray[0]);Will return the value "n" (as a String) in this case.
here is have convert simple string to string array using split method.
String [] stringArray="My Name is ABC".split(" ");Output
stringArray[0]="My";
stringArray[1]="Name";
stringArray[2]="is";
stringArray[3]="ABC";Splitting an empty string with String.split() returns a single element array containing an empty string. In most cases you'd probably prefer to get an empty array, or a null if you passed in a null, which is exactly what you get with org.apache.commons.lang3.StringUtils.split(str).
import org.apache.commons.lang3.StringUtils;
StringUtils.split(null) => null
StringUtils.split("") => []
StringUtils.split("abc def") => ["abc", "def"]
StringUtils.split("abc def") => ["abc", "def"]
StringUtils.split(" abc ") => ["abc"]Another option is google guava Splitter.split() and Splitter.splitToList() which return an iterator and a list correspondingly. Unlike the apache version Splitter will throw an NPE on null:
import com.google.common.base.Splitter;
Splitter SPLITTER = Splitter.on(',').trimResults().omitEmptyStrings();
SPLITTER.split("a,b, c , , ,, ") => [a, b, c]
SPLITTER.split("") => []
SPLITTER.split(" ") => []
SPLITTER.split(null) => NullPointerExceptionIf you want a list rather than an iterator then use Splitter.splitToList().
/** * <pre> * MyUtils.splitString2SingleAlphaArray(null, "") = null * MyUtils.splitString2SingleAlphaArray("momdad", "") = [m,o,m,d,a,d] * </pre> * @param str the String to parse, may be null * @return an array of parsed Strings, {@code null} if null String input */
public static String[] splitString2SingleAlphaArray(String s){ if (s == null ) return null; char[] c = s.toCharArray(); String[] sArray = new String[c.length]; for (int i = 0; i < c.length; i++) { sArray[i] = String.valueOf(c[i]); } return sArray;
}Method String.split will generate empty 1st, you have to remove it from the array. It's boring.
Based on the title of this question, I came here wanting to convert a String into an array of substrings divided by some delimiter. I will add that answer here for others who may have the same question.
This makes an array of words by splitting the string at every space:
String str = "string to string array conversion in java";
String delimiter = " ";
String strArray[] = str.split(delimiter);This creates the following array:
// [string, to, string, array, conversion, in, java]Tested in Java 8
