使用 do while 循环打印菱形时输出不正确

Question

I am creating code to print a diamond using only Do while loops and I have got the following code:

public static void diamond3() {
System.out.println("Output for: Do while Loop");

int noOfRows = DIAMOND_SIZE;

//Getting midRow of the diamond
int midRow = (noOfRows)/2;

//Initializing row with 1
int row = 1;

int i = midRow;

do {
    //Printing i spaces at the beginning of each row
    int j = 1;
    do {
        System.out.print(" ");
        j++;
}
    while (j <= i);


    //Printing j *'s at the end of each row
    j = 1;
    do {
        System.out.print("* ");
        j++;
    }
    while (j <= row);
    System.out.println();

    //Incrementing the row
    row++;

    i--;
}  
while (i > 0);

i = 0;

do { 
    //Printing i spaces at the beginning of each row
    int j = 1;
    do {
        System.out.print(" ");
        j++;
    }
    while (j <= i);

    //Printing j *'s at the end of each row
    int mid = (row+1)/2;
    j = row;
    do {
        if(i==0 && j==mid) 
            System.out.print("o ");

        else 
            System.out.print("* ");
            j--;
    }
    while (j > 0);
    System.out.println();

    //Decrementing the row
    row--;
    i++;
}

while(i <= midRow);
}

Im meant to get a diamond shape but I am getting the following shape:

 * 
 * * 
 * o * 
 * * 
  *

The expected out is:

    * 
  * * * 
* * o * *
  * * * 
    * 

Can someone help figure out where I have gone wrong. I have checked the code so many times but unable to figure out where the mistake is.

Answer 1

This is my approach to this question:

public static void diamond3() {
System.out.println("Output for: Do while Loop");

    int noOfRows =5;
    int md=noOfRows%2;

    //Getting midRow of the diamond
    int midRow = (noOfRows)/2;      

    int i = noOfRows;

    do {
        //Printing i spaces at the beginning of each row

        int j = 1;
        do {
            if (i-md==0) break; 
            System.out.print(" ");
            j++;
    }
        while (j <= i-md);

        //Printing j *'s at the end of each row

        do {
            if (i-md==0 && j==midRow+1){
              System.out.print("o ");   
            } else {
              System.out.print("* ");
            }
            j++;
        }
        while (j <= (noOfRows+1-md));
        System.out.println();


        i=(i - 2);
    }  
    while (i >= 0); 

    i = 2;

    do {
        //Printing i spaces at the beginning of each row

        int j = 1;
        do {
              System.out.print(" ");
            j++;
        }
        while (j <= i);     

        do {
            System.out.print("* ");
            j++;
        }
        while (j <= (noOfRows+1-md));

        System.out.println();

        //Printing j *'s at the end of each row

        i=(i + 2);
    }  
    while (i <=noOfRows);
}