hello.java

java 的程序集合,会节省你很多时间的,有两个包.

import java.lang.*;

import java.io.*;

import java.util.*;

import com.freecn.utils.*;



public class Hello extends Object

{

    /*

    method:       main

    params:

                  1. String[] args

    return type:  void

    create time:  2004-04-01 23:34:09

    author:       gshn

    */

    public  static void main(String[] args)

    {

        //prompt input double array

        Common.printMsg("Please input double array(multi double split with space,i.e 12.1 2.3 3.4)");

        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

        //read a line from console input stream

        try

        {

            String inputArrayStr = in.readLine();

            //parse the input line string into double array

            StringTokenizer st = new StringTokenizer(inputArrayStr);

            ArrayList al = new ArrayList();

            while (st.hasMoreTokens())

            {

                al.add(st.nextToken());

            }

            double[] inputArray = new double[al.size()];

            //format string to double,if error occurs, exit the application

            for (int i=0;i<inputArray.length;i++)

            {

                try

                {

                    inputArray[i] = Double.parseDouble( al.get(i).toString() );

                }

                catch(Exception e)

                {

                    System.out.println(al.get(i).toString() + " isn't a valid double format,error occurs.");

                    return;

                }

            }



            // sort double array

            sort(inputArray);

            // print out the double array after sorted

            for (int i=0;i<inputArray.length;i++)

                System.out.print(inputArray[i]+"\t");



            System.out.println();



        }

        catch(IOException ioe)

        {

            System.out.println(ioe.getMessage());

        }



    }



    /*

    method:       sort

    params:

                  1. double[] list

    return type:  void

    create time:  2004-04-03 23:42:03

    author:       gshn

    */

    public static void sort(double[] list)

    {

        int i,j;

        boolean done=false;

        double temp;

        j=1;

        while( (j<list.length) && (!done) )

        {

            done=true;

            for(i=0;i<list.length-j;i++)

            {

                if(list[i]>list[i+1])

                {

                    done=false;

                    temp=list[i];

                    list[i]=list[i+1];

                    list[i+1]=temp;

                }

            }

            j++;

        }

    }

}