cal.java

简单的计算器 JAVA 代码 命令行下运行

package koala;
/*Cal.java*/
import java.io.*;
public class Cal  //客户类
{
	public static void main(String []args)
	{
		double opd1=0,opd2=0;
		char optr='+';
		try
		{
			try
			{
				BufferedReader b1=new BufferedReader(new InputStreamReader(System.in));
				System.out.print("Input the first number:");
				opd1=Double.parseDouble(b1.readLine());
				
				BufferedReader b2=new BufferedReader(new InputStreamReader(System.in));
				System.out.print("Input the second number:");
				opd2=Double.parseDouble(b2.readLine());
			}
			catch(NumberFormatException e)
			{
				System.out.print("Warning:please input a number!");
				System.out.println(e.getMessage());
				return;
			}
			BufferedReader b3=new BufferedReader(new InputStreamReader(System.in));
			System.out.println("Input the operator:");
			optr=(char)(b3.read());
		}
		catch(IOException e)
		{
			System.out.println(e.getMessage());
		}
		try
		{
			System.out.println("The reasult："+Factory.creator(opd1,opd2,optr).Calculate());
		}
		catch(BadOperatorException e)
		{
			System.out.println(e.toString());
		}
		catch(DivideZeroException e)
		{
			System.out.println(e.toString());
		}
	}
}