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String array problem

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shahazzat

Post subject: String array problem

Posted: Thu Feb 02, 2012 7:16 pm

Joined: Tue Oct 04, 2011 4:34 pm
Posts: 3

What is the problem of following code:

Code:

public void st(){

String[] a=null;
String a1="Hello....";

for(int i=0;i<5;i++){

a[i]=a1;
System.out.println(a[i]);
}
}

error:
Exception in thread "main" java.lang.NullPointerException

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msafwat

Post subject: Re: String array problem

Posted: Tue Feb 21, 2012 8:17 am

Site Admin

Joined: Sat Aug 02, 2008 8:00 am
Posts: 147

The Array object in String[] a=null; is not initialized

All what you have done here is declare a variable called "a" but that variable does not refer to anything
for the code to work it has to be as follows

Code:

public void st(){

String[] a=new String[5];
String a1="Hello....";

for(int i=0;i<5;i++){

a[i]=a1;
System.out.println(a[i]);
}
}

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Java Technical Lead.
Mobile: +2010-2942-538
Email:mtv134@yahoo.com

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