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

Hi,

I have the following code:

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

Code :

---

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)

Quote:

---

Originally Posted by Wanderer

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

Code :

---

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.

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){
			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;
	}

---

System.exit() isn't a good way to terminate a program... it's much safer to simply return.

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 :mad:

Anyway here is the final code.

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