String Index Out of Bounds Exception in Java

Question

Here is input I am supposed to parse: #typ offer; #det free essential supplies 4 evacs pets.; #loc 2323 55th st, boulder; #lat 40.022;

This is my code: System.out.print("Enter a tweet in the correct format: "); String tweet = keyboard.nextLine();

    int start = tweet.indexOf("#");
    int finish = tweet.indexOf(";");
    String type = tweet.substring(start, finish);
    String type2 = type.substring(4,finish);
    String type_2 = type2.toUpperCase();



    String tweet2 = tweet.substring(finish + 1);
    int start2 = tweet2.indexOf("#");
    int finish2 = tweet2.indexOf(";");
    String detail = tweet2.substring(start2, finish2);
    String detail2 = tweet2.substring(5, finish2);



    String tweet3 = tweet2.substring(finish2 + 1);
    int start3 = tweet3.indexOf("#");
    int finish3 = tweet3.indexOf(";");
    String location = tweet3.substring(start3 , finish3);
    String location2 = tweet3.substring(4, finish3);

    /*
    String tweet4 = tweet3.substring(finish3 + 1);
    int start4 = tweet4.indexOf("#");
    int finish4 = tweet4.indexOf(";");
    String latitude = tweet4.substring(start4,  finish4);
    String latitude2 = tweet4.substring(4, finish4);


    String tweet5 = tweet4.substring(finish4 + 1);
    int start5 = tweet5.indexOf("#");
    int finish5 = tweet5.indexOf(";");
    String longitude = tweet5.substring(start5, finish5);
    String longitude2 = tweet5.substring(4, finish5);



    */
    System.out.println();
    System.out.println("Type: " + type_2);
    System.out.println("Detail: " + detail2);
    System.out.println("Location: " + location2);
    //System.out.println("Latitude: " + latitude2);
    //System.out.println("Longitude: " + longitude2);

    keyboard.close();

Ignoring the commented part this line, String location = tweet3.substring(start3 , finish3);, is giving me this error, 40.022;Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -2 at java.lang.String.substring(Unknown Source) at ParseTheTweet.main(ParseTheTweet.java:31).

I commented out other parts to test my code on the given input and it works up until that point. Any ideas on why this is the case?

The exception explains exactly what is wrong - you are passing -2 into `substring`, which I presume (you should look it up, not me!) means that an earlier function call failed to find `#` or `;`. — Ken Y-N, Sep 07 '17 at 03:09
Check as to whether any of the value for start3 or finish3 is a valid value and is not negative. — Soumya, Sep 07 '17 at 03:09

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

0

While your code is expecting longitude information, your input doesnt have longitude information and is the reason for StringIndexOutofBounds.

Enter some thing like, it should work.

typ offer; #det free essential supplies 4 evacs pets.; #loc 2323 55th st, boulder; #lat 40.022;#long 40.022;

edited Jun 20 '20 at 09:12

Community

1
1

answered Sep 07 '17 at 03:13

Anil

595
1
5
15

score 0 · Answer 2 · answered Sep 07 '17 at 05:25

According to you input tweet4 = #lat 40.022; and finish4 = 12. As there is no longitude information in input string tweet4.substring(finish4 + 1) return empty as tweet5.

Moreover start5 and finish5 become -1. Hence tweet5.substring(start5, finish5) evaluated as "".substring(-1, -1) which caused StringIndexOutOfBoundsException.

So you have to add longitude information in your input text.

String Index Out of Bounds Exception in Java

2 Answers2

typ offer; #det free essential supplies 4 evacs pets.; #loc 2323 55th st, boulder; #lat 40.022;#long 40.022;