Error explanation

[tawny summit]

Can anyone explain why this happen?

        String base_line = "_____";
        for(int a : sol) {
            for(int i = 0; i < base_line.length(); i += 1) {
                if(a == 1) {
                    base_line.charAt(i) = '*';
                }
                i += 1;
            }

[timber relic]

Detected code, here are some useful tools:

Formatted code

String base_line = "_____";
for (int a : sol) {
  for (int i = 0; i < base_line.length(); i += 1) {
    if (a == 1) {
      base_line.charAt(i) = ' * ';
    }
    i += 1;
  }

<@&987246399047479336> please have a look, thanks.

[shrewd onyx]

a method call returns an rvalue, you can not assign to an rvalue

charAt returns the char at position i by value you can not assign a char to that char

it is like doing 'a' = '*'

not possible, it is like the linter says, you can only assign to variables and a method call is not a variable

Strings are also immutable so there is no method to change a char at an idex

you maybe want to use an char[]

[lilac mulch]

(not sure that terminology is commonly known in the java world. so might confuse OP)

in java, u can only assign something to variables

foo = ...

not to methods foo() =...

or to literals or anything else

only to variables

[tawny summit]

Oh yes, charAt is a function, I can not adjust it

[lilac mulch]

in ur case ur looking for sth like setChar(...). but such a method doesnt exist for strings

for building ur hangman string it would be better if u dont use String but StringBuilder as ur base instead

that one also supports changing chars easily

alternatively a char[] would also work

but printing it is then for example not as convenient

or checking it against the solution

[tawny summit]

Oh i see

Thanks for you guys explanation

[mint trout]

You probably confused that with array[i] = 'o' because that's possible its not a method