java while loops with strings

Question

I am trying to make a loop that prints "*" as a string a certain number of times, but I can't get it to work. Everything in the main method was given to me and must be used. Everything else I added and I don't know if I am on the right track or not. The end result is suppposed to print "*" seven times horizontally. Then each time it adds a "*", adds one to count, and compares to see if count is greater than or equal to the value I set. Then if it is true it ends the loop and if not it repeats the loop until true. I just don't know how express this in code.

    public class LoopPractice
    {
        public String ast = "*";    

        public static void main(String[] args)
        {

            LoopPractice lp = new LoopPractice();
            System.out.println(lp.getAstWhile(7));
        }   

        public String getAstWhile()  
        {
            int count = 0;
            while (count <= 6)
            {
                System.out.print(count++);
            }
            return ast;
        } 
    }

When you call lp.getAstWhile(7) in the println() function, you're passing an argument but getAstWhile() doesn't have any parameters. — RobertR
– RobertR, Commented Oct 18, 2015 at 23:24

Eliseo · Accepted Answer · 2015-10-18 23:29:11Z

1

You are passing a value "7" to a function that accepts no values, call lp.getAstWhile(); instead of lp.getAstWhile(7);

public String getAstWhile(int maxValue)
{ 
     int count = 0; 
     while (count < maxValue) 
     { 
         system.out.print(count++); 
      } 
}

edited Oct 18, 2015 at 23:29

answered Oct 18, 2015 at 23:23

Eliseo

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3 Comments

Eliseo Over a year ago

Actually if you want it to print 7 times horizontally, change your getAstwhile to the following public String getAstWhile(int maxValue){ int count = 0; while (count < maxValue) { system.out.print(count++); } }

RobertR Over a year ago

If you want to add to your post, edit it. Also, uses code blocks when typing code.

RobertR Over a year ago

No even in the comments. Surround code you want to be part of a sentence with back-ticks (to the left of the "1" key, same key as tilde).

Sammy · Accepted Answer · 2015-10-18 23:42:39Z

0

Use a StringBuffer.

public String getAstWhile()  
    {
        StringBuffer buf = new StringBuffer();
        int count = 0;
        while (count <= 6)
        {
            buf.append('*');
            count++;
        } 
        return buf.toString();
    }

getAstWhile was not returning a String in your original code.

API documentation: http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuffer.html Tutorial on StringBuffer: http://www.tutorialspoint.com/java/java_string_buffer.htm

edited Oct 18, 2015 at 23:42

answered Oct 18, 2015 at 23:25

Sammy

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4 Comments

John Giotta Over a year ago

I'm not sure, as a student, this OP will understand the code you provided. Plus, I'm sure the instructor will notice the degree of change.

Sammy Over a year ago

Surely the student can look up the StringBuffer class. This is the correct and recommended way to build a string in Java.

John Giotta Over a year ago

I suggestion you provide links and comments to help the OP.

Sammy Over a year ago

I added some references. I would however like to point out that if someone introduces a new class, concept etc. to a good student, the first thing that student should be doing is googling for more information. Spoonfeeding the student, especially on such a trivial home-work style quesiton is not a good idea.

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