Adding characters to String

Question

I'm doings some beginners task in JAVA. With the help of FOR I'm going to create two simple triangles by just adding simple characters like * to a string like this:

*
**
***
****
*****

and

*****
****
***
**
*

I have done the first triangle with the code below, perhaps it could be done in some simplier/smarter way? But I'm not sure how to create the other triangle that starts with five * ?

public class Test {

public static void main(String[] args) {

String word = "";

        for (int x=1; x<5+1; x++){
        word += "*";

        System.out.println(word);

        }
}
}

How does your question title relate to your question body?

Oliver Charlesworth
– Oliver Charlesworth

2011-09-10 19:33:05 +00:00
Commented Sep 10, 2011 at 19:33 — Oliver Charlesworth
– Oliver Charlesworth, Commented Sep 10, 2011 at 19:33

Petar Minchev · Accepted Answer · 2011-09-10 19:43:36Z

1

You can do the whole stuff without actually using String variables. Use one loop for every row and a nested loop for the number of asterisks in the current row. When you are at current row you have 6 - current asterisks. Sample code follows:

for (int row = 1; row <= 5; row++) {
   for (int i = 1; i <= 6 - row; i++) {
       System.out.print("*");
   }

   System.out.println();
}

edited Sep 10, 2011 at 19:43

answered Sep 10, 2011 at 19:34

Petar Minchev

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2 Comments

Petar Minchev Over a year ago

@Oli - This site is for questions and answers. The OP showed some effort and I helped him. The question is not a gimme teh codez type. I think you are getting it too serious...

Oliver Charlesworth Over a year ago

That's fair. But your answer would be better served by including some explanation. (I would remove the -1, but I can't until you edit your question again!)

Oliver Charlesworth · Accepted Answer · 2011-09-10 19:34:19Z

0

You can create a "decrementing" loop counter like this:

for (int i = 5; i > 0; i--) {
    // Do something
}

Inside the loop, you could use another loop to create a string of i stars, and then print it.

answered Sep 10, 2011 at 19:34

Oliver Charlesworth

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Comments

Mahesh · Accepted Answer · 2011-09-10 19:37:32Z

0

Hint: Use the same string word, and ask for the substring(int,int). Remember to collect the return value to the old string itself. You need to a loop that runs until the length of string is 0.

answered Sep 10, 2011 at 19:37

Mahesh

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Comments

rsp · Accepted Answer · 2011-09-10 19:38:58Z

0

One possibility would be to use the substring method to print part of a longer string:

public class Test {

    public static void main(String[] args) {

        String stars = "*****";

        for (int x=4; x>=0; x--){

             System.out.println(stars.substring(x));

        }
    }
}

answered Sep 10, 2011 at 19:38

rsp

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