basic reading input from user in java

问题

I want to read a character and store it into the char[] array and here is my method called getaline

public static int getaline(char message[], int maxlength)
{
     int index = 0;
     while (message[index] != '\n')
     {
         message[index] = fgetc(System.out);
         index++;
     }
     index++;
}

and my fgetc method:

public static int fgetc(InputStream stream)

and this method should returns a character from the input stream.

But i keep getting an error message when i compile:

error: possible loss of precision

message[index] = fgetc(System.in);
                       ^
required: char

found:    int

what should i put inside fgetc so that i can collect input from the user??

回答1:

Your code is expecting a char, but you return an int here:

public static int fgetc(InputStream stream)
//            ↑ tells method will return an int

You can

• Change method signature to return a char.

  public static char fgetc(InputStream stream)
  //            ↑ tells method will return a char
  

• Cast returned value to char

  Casting conversion (§5.5) converts the type of an expression to a type explicitly specified by a cast operator (§15.16).

  message[index] = (char) fgetc(System.in);
  //               ↑ cast returning value to a char
  

来源：https://stackoverflow.com/questions/32861671/basic-reading-input-from-user-in-java