c - sort arrays can't get method to work -

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you should change

for (int x = 0; x < sort; x++)  

to

for (int x = 0; x < sort.length; x++) 

instead. and

string[] sort = new string[listnames]; 

to

string[] sort = new string[listnames.length]; 

also , joptionpane.showmessagedialog() should used in way:

joptionpane.showmessagedialog(null," tutor last name , first name listed in alphabetically order"+(x+1)+ " " + "for example: 'smith, john'");