Breaking up a string in Java into a string array

Question

I've researched this subject thoroughly, including questions and answers on this website.... this is my basic code:

import java.util.Scanner;  
class StringSplit {  
public static void main(String[] args)   
{  
    System.out.println("Enter String");    
    Scanner io = new Scanner(System.in);  
    String input = io.next();  
    String[] keywords = input.split(" ");  
    System.out.println("keywords" + keywords);      
}

and my objective is to be able to input a string like "hello, world, how, are, you, today," and have the program break up this single string into an array of strings like "[hello, world, how, are, you, today]... But whenever i compile this code, i get this output: "keywords = [Ljava.lang.String;@43ef9157" could anyone suggest a way for the array to be outputted in the way i require??

Jon Skeet · Accepted Answer · 2012-08-07 00:25:59Z

3

Sure:

System.out.println("keywords: " + Arrays.toString(keywords));

It's not the splitting that's causing you the problem (although it may not be doing what you want) - it's the fact that arrays don't override toString.

answered Aug 7, 2012 at 0:25

Jon Skeet

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2 Comments

Dominic Bou-Samra Over a year ago

Annoyingly don't override toString(). Can anyone explain why?

Jon Skeet Over a year ago

@DominicBou-Samra: Don't know, to be honest. By the time they found out it was annoying, it was probably too late...

Adrian · Accepted Answer · 2012-08-07 00:29:14Z

0

You could try using Java's String.Split:

Just give it a regular expression that will match one (or more) of the delimeters you want, and put your output into an array.

As for output, use a for loop or foreach look to go over the elements of your array and print them.

The reason you're getting the output you're getting now is that the ToString() method of the array doesn't print the array contents (as it would in, say, Python) but prints the type of the object and its address.

answered Aug 7, 2012 at 0:29

Adrian

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2 Comments

Daniel Pryden Over a year ago

The OP is using String.split().

Adrian Over a year ago

Yeah, I saw that after I posted and was about to edit the reply. My bad.

user1406126 · Accepted Answer · 2012-08-07 00:47:38Z

0

This code should work:

String inputString = new String("hello, world, how, are, you, today");    
Scanner scn = new Scanner(inputString);
scn.useDelimiter(",");
ArrayList<String> words = new ArrayList<String>();
while (scn.hasNext()) {
   words.add(scn.next());
}

//To convert ArrayList to array
String[] keywords = new String[words.size()];
for (int i=0; i<words.size(); ++i) {
   keywords[i] = words.get(i);
}

The useDelimiter function uses the comma to separate the words. Hope this helps!

answered Aug 7, 2012 at 0:47

user1406126

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1 Comment

Stephen P Over a year ago

This is just a different way to split the String up into a String Array. The OP's problem is printing the resulting array.

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