readkb.java

来自「java实验答案。其中包括：金额的中文大写方式」· Java 代码 · 共 73 行

// File:	ReadKb.java
// Purpose:	Read an int, a double and String from the keyboard
// Listing:	Chapter 5, Listing 5.3
import java.io.*;				// Access the I/O package

public class ReadKb {
	
	public static double getDouble() { 	// Read a double
		double d = 0.0;
		String s = "";
		
		try	{
			s = getString();
			if (s == null)
				s = "";
			d = Double.parseDouble(s);	// Convert s to d
		}
		catch (NumberFormatException nfe) {	// Catch invalid data
			System.out.println("Not a valid double:  " + s);
			}
		return d;
	}

	public static int getInt() { 			// Read an int
		int i = 0;
		String s = "";
		
		try	{
			s = getString();
			i = Integer.parseInt(s);	// Convert s to i
		}
		catch (NumberFormatException nfe) {	// Catch invalid data
			System.out.println("Not a valid integer:  " + s);
		}
		return i;
	}

	public static String getString()  { // Read a String
		BufferedReader br;
		InputStreamReader isr;
		String s = "";

		isr = new InputStreamReader(System.in);	// Keyboard stream
		br = new BufferedReader(isr);		// Add line buffering
		try	{
			s = br.readLine();		// Read a line
		}
		catch (IOException iox) {		// Catch exceptions
			System.out.println(iox);
		}
		return s;
	}

	public static void main(String[] args) {
		double d;
		int i;
		String s;

		System.out.print("Enter an integer: ");
		i = ReadKb.getInt();
		System.out.println("You entered: " + i);

		System.out.print("Enter a double: ");
		d = ReadKb.getDouble();
		System.out.println("You entered: " + d);

		System.out.print("Enter a string: ");
		s = ReadKb.getString();
		System.out.println("You entered: " + s);
	}
}