Java substring in a string

Question

I know this has question has been asked countless times.. but I can't seem to get it to work. the problems are,

Even converting everything to lower case doesn't work out when "computer" and "Comp" are entered.
If the string is a sentence (I add a space), it essentially skips the substring code and says "Not in the string"..

Help is appreciated. thanks!

Scanner in=new Scanner(System.in);
System.out.println("\fEnter the main string:");

String GivenString=in.next();
System.out.println("Enter the substring :");

String SubString=in.next();

GivenString.toLowerCase();
SubString.toLowerCase();

if(GivenString.indexOf(SubString)!=-1)
{
    System.out.println("Substring is in the given string.");
}
else
{
    System.out.println("Substring is not in the given string.");
}

Please use proper naming conventions. It makes code easier to read. — syb0rg
– syb0rg, Commented Apr 20, 2013 at 19:55

Mike Tunnicliffe · Accepted Answer · 2013-04-20 20:13:43Z

7

Strings are immutable and toLowerCase() returns a new String object. These lines:

GivenString.toLowerCase();
SubString.toLowerCase();

...do not modify the values in GivenString and SubString.

You would need to modify them to:

GivenString = GivenString.toLowerCase();
SubString = SubString.toLowerCase();

edited Apr 20, 2013 at 20:13

answered Apr 20, 2013 at 19:55

Mike Tunnicliffe

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1 Comment

Mike Tunnicliffe Over a year ago

Also, note that by convention in Java (unlike some other languages, like C#) variable names start with a lower case letter, which distinguishes them from class names.

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