usetoken.java

java基础教程以及代码 java base document and code

// 不断的输入浮点数字，如果输入的数字等于0，则程序结束
//                     如果输入的数字不等于0，则将浮点数规范化为2位小数输出

import java.io.*;
import java.util.*;
import java.text.*;

public class UseToken
{
	public static void main (String [] args) throws IOException
	{
		BufferedReader keyboard=new BufferedReader(new InputStreamReader(System.in));

		DecimalFormat df=new DecimalFormat("0.00");

		String t;
		StringTokenizer k;
		k=new StringTokenizer(keyboard.readLine());
	
		t=k.nextToken();
		while (!t.equals("0"))
		{
			double num;
			num=Double.parseDouble(t);
			System.out.println(""+df.format(num));
			if (!k.hasMoreTokens()) 
				k=new StringTokenizer(keyboard.readLine());
			t=k.nextToken();
		}
	}
}