Thread: simple java console program, need help recalling commands

i wanna do this

http://www.google.com/url?sa=t&sourc...yYKNmQ&cad=rja

but on windows and in this java program

 
 
//page 359 # 7 / lab 2
//a "shell" that uses Circle.class
 
import java.util.Scanner;
 
public class circle_main
{
 
	public static void main(String[] args)
	{
		boolean rerun = true;
		//char rerunc;//rerun as a char
 
		Scanner keyboard = new Scanner(System.in);//declairing scanner class
 
		String input = "";
		String prompt = "Prompt";
		Circle circle1 = new Circle(0);
 
		System.out.print("Circle calculator v.90"  + "\n\n\n" + "use \"help\" for help" + "\n\n");
 
		while(rerun)
		{	
 
			System.out.print(prompt + ": ");
			input = keyboard.nextLine();//eats ur input
			//System.out.print(input.substring(0,input.length()) + "\n");
			//System.out.print(input.length() + "\n");
 
			if(input.matches("(?i)help.*") == true)
			{
				System.out.print("\ncommands are:\nprompt <string>\nsetRadius <double>\ngetRadius\ngetArea\ngetDiameter\ngetCircumference\nexit\n\n");
			}
 
			else if(input.matches("(?i)prompt.*") == true)
			{
				prompt = input.substring(7,input.length());
			}
 
			else if(input.matches("(?i)setradius.*") == true)	
			{
				circle1.setRadius(Double.parseDouble(input.substring(10,input.length())));			
			}
 
			else if (input.matches("(?i)getradius.*") == true)
			{
				System.out.print("The radius is: " + circle1.getRadius() + "\n");
			}
 
			else if (input.matches("(?i)getarea.*") == true)
			{
				System.out.print("The area is: " + circle1.getArea() + "\n");
			}
 
			else if (input.matches("(?i)getdiameter.*") == true)
			{
				System.out.print("The diameter is: " + circle1.getDiameter() + "\n");
			}
 
			else if (input.matches("(?i)getcircumference.*") == true)
			{
				System.out.print("The circumference is: " + circle1.getCircumference() + "\n");
			}
 
			else if (input.matches("(?i)exit.*") == true)
			{
				rerun = false;
			}
 
			else
			{
				System.out.print("error, invalid command." + "\n");
			}	
 
 
 
		//System.out.print("\n" + "The area is: " + circle1.getArea() + "\n");//putput from circle
		//System.out.print("The diameter is: " + circle1.getDiameter() + "\n");
		//System.out.print("The circumference is: " + circle1.getCircumference() + "\n\n\n");
 
		//System.out.print("Would you like to rerun the program? (Y/N): ");//rerun?
		//rerunc = keyboard.next().charAt(0);//next char becomes rerunc
 
		//if (rerunc == 'y' || rerunc == 'Y')//if yes
		//{
			//rerun = true;
			//System.out.print("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
		//}
 
		//else//if n e thing besides 'y' || 'Y'
		//{
			//rerun = false;
		//}
 
 
		}	
	}
}

and this class

 
//page 359 # 7
//a class storing gets sets and calculations for circle.java
 
public class Circle 
 
{
 
			private double radius;
 
 
			public Circle()//no arg const
			{
				radius = 0.0;
			}
 
			public Circle(double radiusMain)//radius const
			{
				radius = radiusMain;
			}
 
 
 
			public void setRadius(double radiusMain)//didnt know a better way to do this
			{										//since i didnt use a radius variable in main
				radius = radiusMain;
			}
 
			public double getRadius()//returns radius
			{
				return radius;
			}
 
			public double getArea()//returns area
			{
				return Math.PI * (radius * radius);
			}
 
			public double getDiameter()//returns diam
			{
				return radius * 2;
			}
 
			public double getCircumference()//returns circum
			{
				return Math.PI * (radius * 2);
			}
 
		}

basically what i wanna do, is simulate what windows does in the command.exe, where u can use the up and down arrows to recall and edit previous commands...

thanks ^^

oh and heres the other link cuz it can be hard to find from the first link

The GNU Readline Library