Unexpected Type errors

Question

I\'m getting two small unexpected type errors which I\'m having trouble trying to solve.

The errors occur at:

swapped.charAt(temp1) = str.charAt(temp2);
         


        

Answer 1

Description of String#charAt(int):

Returns the char value at the specified index

It returns the value of the character; assigning values to that returned value in the following lines is the problem:

swapped.charAt(temp1) = str.charAt(temp2);
swapped.charAt(temp2) = temp1;

Also, String#charAt(int) expects an index of a character within the String, not the character itself (i.e. chatAt(temp1) is incorrect), so your method will not work as expected even if you fix the former problem.

Try the following:

String swapped;
if(swap1 > swap2) {
    swap1+=swap2;
    swap2=swap1-swap2;
    swap1-=swap2;
}
if(swap1!=swap2)
    swapped = str.substring(0,swap1) + str.charAt(swap2) + str.substring(swap1, swap2) + str.charAt(swap1) + str.substring(swap2);