Java - String Index Out of Bounds Exception : 11

Question

I am writing a simple program to get the first initial of the last name.

input: Bruce Lee
output: L

Here is the code:

public char getFirstInitial()
    {
        char initial;
        int num = this.getFullName().length();

        while (this.getFullName().charAt(num) != ' ')  //this is line 120
        {
                num--;
        }
        initial = this.getFullName().charAt(num + 1);

        return initial;
    }


public String getFullName()
    {
        return fullName;
    }

I'm getting this error:

java.lang.StringIndexOutOfBoundsException: String index out of range: 11
    at java.lang.String.charAt(Unknown Source)
    at lab1.Person.getFirstInitial(Person.java:120)

I don't get what the problem is. Thank you

int num = this.getFullName().length()-1; Also you can read the doc of charAt. "Returns the char value at the specified index. An index ranges from 0 to length() - 1" — Alexis C.
– Alexis C., Commented Feb 16, 2014 at 17:55

xp500 · Accepted Answer · 2014-02-16 17:56:46Z

2

Don't forget indexes are 0 based. So the first element is at index 0 and last is at lenght -1

You could also check for the index being >= 0 in that loop, in case the specified name is invalid.

answered Feb 16, 2014 at 17:56

xp500

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1 Comment

derco Over a year ago

Thanks!! solved it by adding -1 int num = this.getFullName().length() - 1;

Aniket Thakur · Accepted Answer · 2014-02-16 18:00:12Z

1

Change

int num = this.getFullName().length();

to

int num = this.getFullName().length() - 1;

As indexes start from 0 and go till string.length()-1.

answered Feb 16, 2014 at 18:00

Aniket Thakur

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Comments

Kick · Accepted Answer · 2014-02-16 18:01:05Z

0

name.charAt(num) will throw the exception bcoz index will be 1 less than total length .

Update the code

while (name.charAt(num-1) != ' ')  //this is line 120
        {
                num--;
        }

answered Feb 16, 2014 at 18:01

Kick

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Comments

royal52 · Accepted Answer · 2014-02-16 18:28:52Z

0

In java there are always problems arisses when you perform index wise operations on a string therefore firstly you should convert the stricng into character array then you should perform operations, as the others described above if you use length()-1 instead of length() then array out of bounds error would be remove.

answered Feb 16, 2014 at 18:28

royal52

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