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package  practiceGO;
/*
  * *
  * **
  * * *
  * *  *
  * *****
  */
public  class  Cto {
 
     public  static  void  main(String[] args) {
         for ( int  i= 0 ; i< 5 ; i++){
             for ( int  j= 0 ; j<(i+ 1 ); j++){
                 if  (i>= 2  && i<= 3 ) {
                     if  (j== 0  || j==i) {
                         System.out.print( "*" );
                     } else  {
                         System.out.print( " " );
                     }
                 } else {
                     System.out.print( "*" );
                 }
             }
             System.out.println();
         }
     }
}

运行结果:

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*
**
* *
*  *
*****