Java solution to the CrossCharacter problem

CrossCharacter.java

// Cross character solution
import java.util.Scanner;
import java.util.ArrayList;

public class CrossCharacter {
	public static void main(String[] a) {
	
		Scanner in = new Scanner(System.in);
		
		System.out.println("Enter the number of test cases");
		int t = in.nextInt();
		
		System.out.println("enter all the "+t+" test cases line by line");
		ArrayList<String> input = new ArrayList<String>();
		
		in.nextLine();
		for(int i = 0; i<t; i++){
			input.add(in.nextLine());
		}
		
		System.out.println("the input is: "+input);
		
		for(int i = 0; i<t; i++){
			//consider the ith test case
			int l = input.get(i).length();
			boolean flag = true;
			
			for(int j = 0, before = 0, after = l-1; j<l; j++){
				char c = input.get(i).charAt(j);
				// passed capacity to it
				StringBuilder sb = new StringBuilder(l-1-j);
				
				for (int k = 0; k < after; k++){
 					sb.append(" ");
				}
				String spaceAfter = sb.toString();
				
				StringBuilder sbt = new StringBuilder(l-1-j);
				
				for (int k = 0; k < before; k++){
 					sbt.append(" ");
				}
				String spaceBefore = sbt.toString();
				
				if(after == 0){
					System.out.println(spaceBefore+c+c);
					flag = false;
				}
				else if (after == -1){
					System.out.println(spaceBefore+c);
					flag = false;
				} else{
					System.out.println(spaceBefore+c+spaceAfter+c);
				}
				
				//update space numbers
				if(flag){
					after = after - 2;
					before = before + 1;
				}else{
					after = after + 2;
					before = before - 1;
				}
				
			}
		}
		
		in.close();
		System.exit(0);
	}
}

Problem statement given here - https://practice.geeksforgeeks.org/problems/cross-character/0