Printing *s as triangles in Java?

Question

My assignment in my Java course is to make 3 triangles. One left aligned, one right aligned, and one centered. I have to make a menu for what type of triangle and then input

Answer 1

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      Scanner sc = new Scanner(System.in);
      int n=sc.nextInt();
      int b=0;
      for(int i=n;i>=1;i--){
      if(i!=n){
      for(int k=1;k<=b;k++){
      System.out.print(" ");
        }
            }
       for(int j=i;j>=1;j--){
       System.out.print("*");
       if(i!=1){
       System.out.print(" ");
        }
            }
       System.out.println();
       b=b+2;
        }

Output:: 5

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