Why can't the internal class defined in the method only access local variables of the final type in the method?

Class inout {string STR = new string ("between"); Public void amethod (final int iargs) {int it315 = 10; Class bicycle {public void sayhello () {system. out. println (STR); system. out. println (iargs); system. out. println (it315); // compilation error: inout. java: 13: local variable it315 is accessed from within inner class; needs to be declared final }}}}

Java stipulates that the internal class can only access the member variables in the external class and cannot access the variables defined in the method. To access the variables in the method, declare the variables in the method as final (constant) because this can render the variable, it is equivalent to being defined externally rather than in the method.