doublesum.java

单词计算器,可以统计你输入的单词的字母数有多少个等多个程序

import java.util.Scanner;
import java.util.*;
import javax.swing.JOptionPane;
public class DoubleSum 
{
    double sum=0;
    public static void main(String[] args) 
    {
       double sum=0;
       if(args.length>=1)
       {
           for(int i = 0;i<args.length;i++)
           {
           Scanner scanner = new Scanner(args[i]);
           while(scanner.hasNext())
           {
               sum+=scanner.nextDouble();
           }
           }
           System.out.println("SUM="+sum);
           System.exit(0);
       }
       else
       {
           String str;
           str = JOptionPane.showInputDialog(null,"输入多个用空格分隔的实数:","实数求和",JOptionPane.QUESTION_MESSAGE);
           StringTokenizer tokenizer = new StringTokenizer(str);
           while(tokenizer.hasMoreTokens())
               {
               sum+=Double.parseDouble(tokenizer.nextToken());
               }
       JOptionPane.showMessageDialog(null, "SUM="+sum);
       System.exit(0);
       }
    }
}