Thread: How To Make The Program Jump To The Next Function..

Hi,

I have the following code:

 private static LinkedList InitListA()
  {
 
      LinkedList ListA = new LinkedList();
      String Temp = null;
      int counter, buffer = 0;
 
 
        for (counter = 0; counter < MAX; counter++)
         {
          System.out.println("Enter Some Integer Values For List 'A':");
          BufferedReader InputStream = new BufferedReader(new InputStreamReader(System.in));
 
            try
            {
              Temp = InputStream.readLine().toString();
              buffer = Integer.parseInt(Temp);
              ListA.add(new Integer(buffer));
 
            }}
            catch (IOException e)
            {
              e.printStackTrace();
            }
         }
 
      return ListA;
 }

I want InitListA() to terminate when <ENTER> is pressed with no strings keyed in.
How do I do it ?

Hi kumarr, To make a program exit on enter, implement something like this

public static void main(String[]args){
		BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
		while(true){
			String s = null;
			try {
				s = br.readLine();
			} catch (IOException e) {
			}
 
                       if(s.length() == 0){
				System.out.println("Exiting...");
				System.exit(0);
			}
 
                       // add your program logic here
 
 
          }
	}

cheers, wanderer(prit4u.wordpress.com)

Originally Posted by Wanderer

Hi kumarr, To make a program exit on enter, implement something like this

public static void main(String[]args){
		BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
		while(true){
			String s = null;
			try {
				s = br.readLine();
			} catch (IOException e) {
			}
 
                       if(s.length() == 0){
				System.out.println("Exiting...");
				System.exit(0);
			}
 
                       // add your program logic here
 
 
          }
	}

cheers, wanderer(prit4u.wordpress.com)

Hey, would it work with LinkedList type ? Cuz I was getting some exceptions earlier with this same method.

Well if you post the final code here, I can probably look at it.

 
public class ExitOnEnter {
 
	public static void main(String[]args)
        {
            LinkedList ListA = new LinkedList();
            int buffer;
 
		BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
		while(true){
			System.out.println("Press enter to exit");
			String s = null;
			try {
				s = br.readLine().toString();
                                buffer = Integer.parseInt(s);
                                ListA.add(new Integer(buffer));
 
 
 
			} catch (IOException e) {
				e.printStackTrace();
			}
			if(s.length() == 0 || isStringOfSpaces(s)){
				System.out.println("Exiting...");
				System.exit(0);
			}
		}
	}
	private static boolean isStringOfSpaces(String s){
		for(char c : s.toCharArray()){
			if(c != ' ')
				return false;
		}
		return true;
	}

Well if you look at what I wrote, I told you to implement the logic after the check of s.length.
You are getting an exception basically due to the parseInt().
You cannot convert an empty string to an integer

Anyway here is the final code.

public class ExitOnEnter {
 
       public static void main(String[]args)
       {
           LinkedList ListA = new LinkedList();
           int buffer;
 
               BufferedReader br= new BufferedReader(new InputStreamReader(System.in));
               while(true){
                       String s = null;                
 
                       try {                    	   
                           s = br.readLine().toString();
                        } catch (IOException e) {
		                       e.printStackTrace();
		                }                  
 
                       if(s.length() == 0 || isStringOfSpaces(s)){
                    	   System.out.println("ListA: "+ListA);
                           System.out.println("Exiting...");
                           return;
                       }else{
                           buffer = Integer.parseInt(s);
                           ListA.add(new Integer(buffer));
                        }           
 
               }
 
       }
 
       private static boolean isStringOfSpaces(String s){
               for(char c : s.toCharArray()){
                       if(c != ' ')
                            return false;
               }
               return true;
       }
}

Cheers,
Wanderer
[prit4u.wordpress.com]

Thanks for helloworld922 for the advice