在不使用任何String函数的情况下读取Character数组中的字符串，甚至不使用Java中的charAt

Question

I want to read a String in a char array without using any of String class function, not even charAt(), lenght() in Java. I know one method char c=(char) System.in.read(). But in this, the user char write a whole sentence on command Line even for inputting a single char. I want that user will be able to type one character and then i can do some operations on it, then the next character on the same line....(as we do in c++) . Please give me some suggetstions. I want a code working similar like in c++

// c++ code
char c, d[50];
cin.get(c); 
int i=0;
while(c != '\n')
{
    d[i++]=c;
    ...           //any expressions
    ...
    cin.get(c); 
}

Answer 1

There's no easy way to handle one character at a time.

See on SO this and this . You may work around this problem with some headaches and on particular OSes and no data from System.in but rather from your own structures. If you find a way to flush System.in at each keystroke, your problem is solved. As far as I know, you can't register a keyboard IRQ from Java.

Your no- String requirement is the easy part, as you may use the same structure as you would in C++. The problem is the mechanism behind cin.get() which has no analogue in Java.