Draw hollow diamond shape in Java code in which user enter its desire size of diamond Using nested for loop and asterisk

Ngooom

package ngoom;

import java.util.ArrayList;
import java.util.Stack;

public class Ngoom {

    
    static final int input = 13; /// عدد الصفوف ولازم يكون فردى
    
    public static void printFirstSpaceInvers(int lineNum ){
        int var = input/2;
        switch(lineNum){
            case input :
                for(int spaceLoop = 0; spaceLoop<var; spaceLoop++)
                    System.out.print(" ");
                break;
            default:
                for(int spaceLoop = 0; spaceLoop<(lineNum - var); spaceLoop++)
                    System.out.print(" ");
                break;       
                
        }
        
    }
    public static void printFirstSpace(int lineNum){
        int var = input/2;
        switch(lineNum){
            case 0:
                for(int spaceLoop = 0; spaceLoop<var; spaceLoop++)
                    System.out.print(" ");
                break;
            case input :
                for(int spaceLoop = 0; spaceLoop<var; spaceLoop++)
                    System.out.print(" ");
                break;
            default:
                for(int spaceLoop = 0; spaceLoop<(var - lineNum); spaceLoop++)
                    System.out.print(" ");
                break;       
                
        }
        
    }
    public static String printSecondSpace(int lineNum){
        
        String space = "";
        switch(lineNum){
            
            default:
                for(int spaceLoop = 0; spaceLoop < ((lineNum*2)-1); spaceLoop++)
                    space += " ";
                break;       
            
        }
       return space; 
    }
    public static String printSecondSpaceInvers(int lineNum){
          String space = "";
        switch(lineNum){
            
            default:
                for(int spaceLoop = 0; spaceLoop < ((lineNum*2)-1); spaceLoop++)
                    space += " ";
                break;       
            
        }
       return space;
        
    }
    public static void main(String[] args) {
        // TODO code application logic here
          Stack<String> space = new Stack<>();
          for(int i=0; i<input; i++){
           if(i < input/2){
             printFirstSpace(i);
             System.out.print("*");
             if(i == (input-1) || i == 0){
              System.out.println("");
              continue;             
              }                
           System.out.println(printSecondSpace(i) + "*");
           space.push(printSecondSpace(i));
              
          }
              else
                  if(i > input/2){
                      printFirstSpaceInvers(i);
            System.out.print("*");
            if(i == (input-1)){
                System.out.println("");
                continue;              
            }                
              System.out.println(space.pop() + "*");
            
                  }
                  else if(i == input/2){
             printFirstSpace(i);
             System.out.print("*");
             if(i == (input-1) || i == 0){
              System.out.println("");
              continue;             
              }                
           System.out.println(printSecondSpace(i) + "*");
           
              
          }
           
            }
            
        }
        
    }