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java triangle

Posted on 2011-03-01
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Last Modified: 2012-05-11
how is it possible to draw this type of triangle in java:

    *
  **
***
and

***
 **
   *
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Question by:pauledwardian
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5 Comments
 
LVL 47

Expert Comment

by:for_yan
ID: 35014431
What do you mean by that question?
You cat just print like that:

System.out.println("  *");
System.out.println(" **");
System.out.println("***");

or you can create a panle and draw them and fill them in.

Please, explain what do you mean by this question?

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Author Comment

by:pauledwardian
ID: 35014481
can you do these two triangles  by for loops please?

thanks,
edward
0
 
LVL 20

Expert Comment

by:Sathish David Kumar N
ID: 35014812
put for loop !
and use system.out.print

for each(increment) it will print one *

put if  inside the loop
system.out.println

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LVL 3

Accepted Solution

by:
rmonsen earned 2000 total points
ID: 35015854
		int trisize = 3;

		// Draw first triangle
		for (int i = 1; i <= trisize; i++) {
			// Spaces infront
			for(int j = 0; j < trisize - i; j++ ) {
				System.out.print(" ");
			}
			// stars
			for(int j = trisize; j > trisize - i; j-- ) {
				System.out.print("*");
			}
			System.out.println();
		}

		// Draw second triangle
		for (int i = trisize; i >= 1; i--) {
			// Spaces infront
			for(int j = 0; j < trisize - i; j++ ) {
				System.out.print(" ");
			}
			// stars
			for(int j = trisize; j > trisize - i; j-- ) {
				System.out.print("*");
			}
			System.out.println();
		}


		// Draw both in one loop
		for (int i = trisize; i >= -trisize; i--) {
			int stars = 1 + trisize - Math.abs(i);
			if (i == 0) continue; // Skip iteration
			
			for(int j = 0; j < trisize - stars; j++ ) {
				System.out.print(" ");
			}
			// stars
			for(int j = trisize; j > trisize - stars; j-- ) {
				System.out.print("*");
			}
			System.out.println();
		}

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