Java Data Type - 如何按字符处理连续输入

import java.io.Console;
import java.io.IOException;

public class Main {
  public static void main(String[] args) throws IOException {
    Console cons = System.console();
    if (cons == null) {
      System.out.println("Console is null");
      System.exit(-1);
    } else {
      System.out.println("Enter text, or \"z\" to exit:");
      while (true) {
        char c = (char) cons.reader().read();
        System.out.println("" + c);
        if (c == 'z') {
          System.exit(0);
        }
      }
    }
  }
}