Reports expressions of the char type used in addition or subtraction expressions.

Such code is not necessarily an issue but may result in bugs (for example, if a string is expected).

Example: int a = 'a' + 42;

After the quick-fix is applied: int a = (int) 'a' + 42;

For the String context:

int i1 = 1;
int i2 = 2;
System.out.println(i2 + '-' + i1 + " = " + (i2 - i1));

After the quick-fix is applied:

System.out.println(i2 + "-" + i1 + " = " + (i2 - i1));