Java patten draw within for loop

Question

I am very new in the programming world and in Javaland too. I am trying to learn for loop and solving pattern with it.

I want to draw this pattern using for loop :

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

I am using this code to achieve this:

public class PatterWithForLoop {

    public static void main(String args[]){
        for(int i = 0; i <= 5; i++){
            System.out.println("*" + "\n");
        }
    }
}

But, I am only getting * in 15 lines, not in the pattern. Please, anyone can help to solve this issue here?

Thanks in advance.

Please show a bit more context. That for loop shouldn't run any iteration at all. — Federico klez Culloca
– Federico klez Culloca, Commented May 29, 2020 at 8:05
Hint: search the doc for the difference between print and println. — Serge Ballesta
– Serge Ballesta, Commented May 29, 2020 at 8:11
Thanks Serge. Khelwood, I have updated my code with more detail. — Nipam Patel
– Nipam Patel, Commented May 29, 2020 at 8:12

Brian · Accepted Answer · 2020-05-29 08:30:27Z

4

If you are using JDK 11, you can write the following code:

for(int i = 0; i < 5; i++) {
    System.out.println("*".repeat(i+1));
}

With String.repeat(), you can do the same thing with less code.

answered May 29, 2020 at 8:30

Brian

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Comments

GameDroids · Accepted Answer · 2020-05-29 08:18:55Z

2

Your for-loop seems strange.

The loop should be read like this:

"For int i starting at 0, loop as long as i<5 and after every iteration, do i++"

for(int i = 0; i<5, i++){
   System.out.println("*" \n);
}

This will print 5 rows:

*

*

*

*

*

now in every row you want one more * and you might want to remove the \n which is already included in println So instead of printing "*" you create a String before the loop and you add one new * to it every iteration:

String line ="";             // we start with an empty string
for(int i=0; i<5; i++){      
   line= line+"*";           // before printing we add a new *
   System.out.println(line); // then we print it 
}

It should (haven't tested it) result in this:

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

edited May 29, 2020 at 8:18

answered May 29, 2020 at 8:12

GameDroids

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1 Comment

Nipam Patel Over a year ago

I am trying to give tick your answer but not able to do as I don't have enough reputation but I will do it later. Thanks.

Som · Accepted Answer · 2020-05-29 08:19:25Z

1

Try this code :

public class Main {
    public static void main(String[] args) {

        int i, j, n =5;  
        for(i=0; i<n; i++) {           
            for(j=0; j<=i; j++) {       
                System.out.print("*");
            }
            System.out.println();
        }
    }       
}

edited May 29, 2020 at 8:19

answered May 29, 2020 at 8:12

Som

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2 Comments

Nipam Patel Over a year ago

Thanks, Som. That's works. I never thought for loop inside for loop. Sorry, I tried to tick your answer but I don't have enough reputation to do it. Will accept it later Thanks.

Som Over a year ago

@NipamPatel : Welcome bro !

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