Java Array Parsing

Question

Lets say I have a string array called ar1, ar1[x] is "Harry Potter"

Now lets say I have another string array called ar2, I want ar2[x] to equal "Harry". How would I do this?

Here is something I tried, it did not work.

String ar2[] = new String[10];
int x = 0;        
while(x<9){
        ar2[x] = ar1[x].split(" ").toString();
        x++;
        System.out.println(ar2[x]);}}}

the out put was 9 null's.

Your problem is that you print value after incrementing index. — Alex Salauyou
– Alex Salauyou, Commented Mar 31, 2015 at 22:40

Daniel Nugent · Accepted Answer · 2015-03-31 22:50:03Z

1

It looks like you're calling toString() on a String array. The 'split()' method Returns a String array, and what you want is the first element in the array resulting from the split.

It looks like you want something like this:

    String ar2[] = new String[ar1.length]; //better if this is not hard coded to 10
    int x = 0;        
    while(x < ar1.length){
            String[] temp = ar1[x].split(" ");
            ar2[x] = temp[0];
            x++; //Moved in initial edit to fix null printing
     }

     //moved printing code out of loop where populating array occurs 
     for (int i = 0; i < ar2.length; i++){
            System.out.println(ar2[i]);
     }

edited Mar 31, 2015 at 22:50

answered Mar 31, 2015 at 22:38

Daniel Nugent

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4 Comments

Daniel Nugent Over a year ago

Thanks @Sasha Salauyou, fixed.

Josh Over a year ago

this also prints just null

Josh Over a year ago

thank you guys a simple error by me ): thank you sasha and daniel

Mike D Over a year ago

might add a note that the x++ had to moved.

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