Error retrieving Int from Java String

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I keep getting an "invalid int" error in logcat, how do I correct this?

check.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View v) {
           digits.replaceAll("[^0-9]","");
           String[] guessArray = digits.split("");
           int[] guessInt = new int[6];
           for(i=0;i<5;i++){
               guessInt[i] = Integer.parseInt(guessArray[i]);
               if(guessInt[i] == actualInt[i]){
                   correct++;
               }
               else{
                   easyGuessDisplay.setText("Sorry! Try again!");
                   break;
               }
           }
       }
   });

in this case digits is a String I split into an array and then the value of each index is compared to a previously stored array. I get a crash and logcat yells at me:

java.lang.NumberFormatException: Invalid int: ""
            at java.lang.Integer.invalidInt(Integer.java:138)
            at java.lang.Integer.parseInt(Integer.java:358)
            at java.lang.Integer.parseInt(Integer.java:334)

I want to extract all the integers from digits and store them in a new array for comparison.


Strings are immutable and hence not modified in place.

You need

digits = digits.replaceAll("[^0-9]","");

Also, split("") will return leading empty string before Java 8. You need to account for that too.

Probably do,

guessInt[i] = Integer.parseInt(guessArray[i + 1]);