public class Class1 {

    public static void main(String[] args) {
        int k, h;
        for (k = 1; k <= 7; k++) {
            for (h = 0; h <= 7 - k; h++) {
                System.out.print(" ");
            }
            for (h = 1; h <= 2 * k - 1; h++) {
                System.out.print("*");
            }
            System.out.println("");
        }
    }
}

------解决方案--------------------
参考楼上的答案，我再给你加一点难度来帮你更好的了解，
希望对你有帮助，呵呵

/*
      *
     * *
    *   *
   *     *
  *       *
 *         *
  *************
  
  */
public class PyramidPrint {
	  public static void main(String[] args) {
	  int k,h;
 for (k = 1; k <= 7; k++)  
	  {  
	  for (h =0; h <= 7-k; h++)  
		  System.out.print(" ");
	  for (h = 1; h <= 2 * k - 1; h++)
	  	{
		  if(k==1||k==7)
			  System.out.print("*");
		  else {
			  if(h==1||h==2*k-1)
				  System.out.print("*");
			  else
				  System.out.print(" ");
		  }
	  	}
	  System.out.println("");
	  }
 }
}

------解决方案--------------------
补充一下
我上面的图形没有打印出来
应该打印出
Java code



/*
       *
      * *
     *   *
    *     *
   *       *
  *         *
 *************
 
 */
public class PyramidPrint {
      public static void main(String[] args) {
      int k,h;
  for (k = 1; k <= 7; k++) 
      {   
      for (h =0; h <= 7-k; h++)   
          System.out.print(" ");
      for (h = 1; h <= 2 * k - 1; h++)
          {
          if(k==1||k==7)
              System.out.print("*");
          else {
              if(h==1||h==2*k-1)
                  System.out.print("*");
              else
                  System.out.print(" ");
          }
          }
      System.out.println("");
      }
  }
}

------解决方案--------------------
这个呢？
public void print4(){
		for(int i=0;i<7;i++){
			for(int a=1;a<7-i;a++){
				System.out.print(" ");
			}
			for(int b=1;b<=i+1;b++){
				System.out.print("*");
				System.out.print(" ");
			}
			System.out.println();
		}
	}

------解决方案--------------------
public class Class1 {
		  public static void main(String[] args) {
		  int k,h;
		  for (k = 1; k <= 7; k++) {  
			  for (h =7; h >=k; h--)  
				  System.out.print(" ");
		  for (h = 1; h <= 2 * k - 1; h++)
		  System.out.print("*");
		 
		  System.out.println("");
		  }
		  }
		}