程序员的代码就是他的语言，呵呵，给你帖一个代码吧（Java的I/O部分比较繁琐，到现在我也没真正掌握，只能按需查阅API)
/* File: ReadInt.java
Author: Kai
*/
import java.io.*;
public class ReadInt
{
public static void main(String [] args)throws IOException
{
BufferedReader din = new BufferedReader(
new InputStreamReader(System.in));
System.out.print("anInt: ");
//"parseInt" parses the string argument as a signed
//decimal integer
int anInt = Integer.parseInt(din.readLine());
System.out.println(anInt);
// read an float number
System.out.print("a Float: ");
float aFloat = Float.parseFloat(din.readLine());
System.out.println(aFloat);
// read an double number
System.out.print("a Double: ");
double aDouble = Double.parseDouble(din.readLine());
System.out.println(aDouble);
}
}
