nine.java

说明在java压缩包中

import java.awt.*;
import java.io.*;
import java.util.Vector;
public class Nine
{
	DataInputStream din =new DataInputStream(System.in);
	Vector vct = new Vector();
	String InputStr="";
	int type;
	public int menu()
	{
		System.out.println(" Conversion");
		System.out.println("1.Decimalist to Binary(10->2):");
		System.out.println("2.Binary to Decimalist(2->10):");
		System.out.print("Please choice:");
		try
		{
			InputStr=din.readLine();
			type = Integer.parseInt(InputStr);
		}
		catch(IOException e)
		{
			System.out.println(e.getMessage());
		}
		return type;
	}
	public void TenconversionTwo()
	{
		int N;
		System.out.print("Please input a integer number:");
		try
		{
            InputStr=din.readLine();
			N = Integer.parseInt(InputStr);
			while(N!=0)
			{
				vct.addElement(new Integer(N%2));
				N = N/2;
			}
			int length = vct.size();
			System.out.print("The binary digit is:");
			for(int i=length-1;i>=0;i--)
			{
				System.out.print(vct.elementAt(i));
			}
			System.out.println();
		}
		catch(IOException e)
		{
			System.out.println(e.getMessage());
		}
	}
	public void TwoconversionTen()
	{
		int N = 0;
		System.out.print("Please input a binary number:");
		try
		{
            InputStr=din.readLine();
            int length = InputStr.length();
            for(int i=0;i<length;i++)
            {
				vct.addElement(new Character(InputStr.charAt(i)));
				//if(vct.elementAt(i)!='0' && vct.elementAt(i)!='1')
				//{
				//	System.out.println("   Input Error!");
				//	return ;
				//}
			}
			for(int i=length-1;i>=0;i--)
			{
				int temp = Integer.parseInt(vct.elementAt(i).toString());
				N += temp * Math.pow(2,length-i-1);
			}
			System.out.println("   The integer digit is:"+N);
		}
		catch(IOException e)
		{
			System.out.println(e.getMessage());
		}
	}
	public static void main(String args[])
	{
		Nine nine = new Nine();
		if(nine.menu()==1)
			nine.TenconversionTwo();
		else
			nine.TwoconversionTen();
	}
}