我怎样才能打印一个三角形与“*”在Java循环使用？ [英] How can i print a triangle with "*"s using for loop in java?

问题描述

我想绘制一个三角形与下面的星星使用循环，但我真的不知道如何做到这一点？三角形将如下所示：

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

<等等。任何人都可以帮我吗？

  public class Project1 {
 public static void main（String [] args）{
 int c， d，e; （c = 1; c <= 8; c ++）{
 for（d = 1; d <= c; d ++）{
 System.out.print（* ）; 
} 
 System.out.println（）; （e = 1; e <= 4; e ++）{
} 
 
 System.out.println（***）; 
 
 
 
 
 
 
这是我发现的从互联网，但我不明白为什么它使用两个循环。 （我明白用来构造干的）。         （String [] args）
 {
 
 StringBuilder stars = new StringBuilder（）; 
 
（int i = 0; i <= 10; i ++）
 {
 stars.append（*）; 
 System.out.println（stars）; 
 
 
 
 
 
 
或者使用嵌套循环:(这是练习是真的试图让你做的）
  public static void main（ （int i = 0; i <= 10; i ++）
 {
 for（int j = 0; j< = i; j ++）
 {
 System.out.print（*）; 
} 
 System.out.print（\\\
）; 
} 
} 
  
 
I want to draw a triangle with stars like below using for loop, but i really don't have any idea of how to do this ? Triangle is going to be like this: 
*
**
***
****
*****
******
*******
********
*********
**********
and so on. Can anybody please help me ? 
public class Project1 {
    public static void main (String[] args){
        int c, d, e;
        for (c = 1 ; c <= 8 ; c++){
            for (d = 1 ; d <= c ; d++){
                System.out.print ("*");
            }
            System.out.println("");
        }

        for (e = 1 ; e <= 4 ; e++){
            System.out.println ("***");
        }
    } 
} 
This is what i have found from the internet, but i did not understand the reason why it uses two loops. ( i understood the one used to construct the stem. ) 
解决方案
public static void main(String[] args)
{

    StringBuilder stars = new StringBuilder();

    for(int i = 0; i <= 10; i++)
    {
           stars.append("*");
           System.out.println(stars);
    }

}
Or alternatively using nested loops: (This is what the exercise was really trying to get you to do)
public static void main(String[] args)
{
    for(int i = 0; i <= 10; i++)
    {
        for(int j=0; j<=i; j++)
        {
            System.out.print("*");
        }
        System.out.print("\n");
    }
}


                        
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