数据结构《书里面的ConsoleReader.java文件》

package ConsoleReader;

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.IOException;

/**

A class to read strings and numbers from an input stream.

This class is suitable for beginning Java programmers.

It constructs the necessary buffered reader

handles I/O exceptions and converts strings to numbers.

*/

public class ConsoleReader

{ /**

Constructs a console reader from an input stream

such as System.in

@param inStream an input stream

*/

public ConsoleReader(InputStream inStream)

{ reader = new BufferedReader

(new InputStreamReader(inStream));

}

/**

Reads a line of input and converts it into an integer.

The input line must contain nothing but an integer.

Not even added white space is allowed.

@return the integer that the user typed

*/

public int readInt()

{ String inputString = readLine();

int n = Integer.parseInt(inputString);

return n;

}

/**

Reads a line of input and converts it into a floating-

point number. The input line must contain nothing but

a nunber. Not even added white space is allowed.

@return the number that the user typed

*/

public double readDouble()

{ String inputString = readLine();

double x = Double.parseDouble(inputString);

return x;

}

/**

Reads a line of input. In the (unlikely) event

of an IOException the program terminates.

@return the line of input that the user typed null

at the end of input

*/

public String readLine()

{ String inputLine = "";

try

{ inputLine = reader.readLine();

}

catch(IOException e)

{ System.out.println(e);

System.exit(1);

}

return inputLine;

}

private BufferedReader reader;

}