Inverted half pyramid

 * * * * *

* * * *

* * * 

* *

*

public class Main {

  public static void main(String[] args) {
    int rows = 5;

    for (int i = rows; i >= 1; --i) {
      for (int j = 1; j <= i; ++j) {
        System.out.print("* ");
      }
      System.out.println();
    }
  }
}

1 2 3 4 5
1 2 3 4 
1 2 3
1 2
1

public class Main {

  public static void main(String[] args) {
    int rows = 5;

    for (int i = rows; i >= 1; --i) {
      for (int j = 1; j <= i; ++j) {
        System.out.print(j + " ");
      }
      System.out.println();
    }
  }
}

        *
      * * *
    * * * * *
  * * * * * * *
* * * * * * * * *
public class Main {

  public static void main(String[] args) {
    int rows = 5, k = 0;

    for (int i = 1; i <= rows; ++i, k = 0) {
      for (int space = 1; space <= rows - i; ++space) {
        System.out.print("  ");
      }

      while (k != 2 * i - 1) {
        System.out.print("* ");
        ++k;
      }

      System.out.println();
    }
  }
}


* * * * * * * * *
  * * * * * * *
    * * * * *
      * * *
        *
public class Main {

  public static void main(String[] args) {
    int rows = 5;

    for(int i = rows; i >= 1; --i) {
      for(int space = 1; space <= rows - i; ++space) {
        System.out.print("  ");
      }

      for(int j=i; j <= 2 * i - 1; ++j) {
        System.out.print("* ");
      }

      for(int j = 0; j < i - 1; ++j) {
        System.out.print("* ");
      }

      System.out.println();
    }
  }
}