Splitting String Efficiency

Hi,

The scenario is that I want to split the string into 10 chars length each. do you think that the below codes are efficient as String is immutable? If not, can you let me know how to improve below codes?

            String a = "12345667788";
            
            StringBuffer sb = new StringBuffer();
            sb.append(a);
            
            int part = 1;
            while (sb.length() > 0) {
                  System.out.println("Entering " + part);
                  
                  String temp = sb.substring(0, sb.length() >= 10 ? 10 : sb.length());
                  sb.delete(0, sb.length() >= 10 ? 10 : sb.length());                  
                  
                  System.out.println("temp = " + temp);
                  part++;
            }
            
            sb = null;

Thanks
David
LVL 16
suprapto45Asked:
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objectsConnect With a Mentor Commented:
you can just use substring directly on the original string

int pos = 0;
while (pos<a.length()) {
   String next = a.substring(pos, Math.min(pos+10, a.length()));
   pos += 10;
}
0
 
suprapto45Author Commented:
Thanks,

But I thought that String is immutable and that is the reason why I used StringBuffer. Or am I missing some concepts here? ;)

Thanks
David
0
 
suprapto45Author Commented:
Oppsss...

I think that I know what you mean.

Do you mean this? If so, yes it is much cleaner and better I think.

            String a = "12345667788";
            
            StringBuffer sb = new StringBuffer();
            sb.append(a);
            
            int part = 1;
            int pos = 0;
            
            while (pos < sb.length()) {
                  System.out.println("Entering " + part);
                  String temp = sb.substring(pos, Math.min(pos+10, sb.length()));                  
                  System.out.println("temp = " + temp);
                  
                  pos += 10;
                  part++;
            }
            
            sb = null;

Thanks
David
0
 
objectsCommented:
substring() returns a new string, it doesn't modify the original one
0
 
suprapto45Author Commented:
Thanks mate
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