如何检查是否已输入值？在do while循环中？

Question

此getsize方法要求数字在方矩阵中为空白。输入后，它将返回新矩阵。我想在do-while循环中检查这些值。我添加了完整的代码。如果要输入的值之一出现多次，我想打印出来，然后选择将矩阵中的该点更改为新数字。

import java.util.Scanner;

公共课广场{

    private int [][]matrixblank;
    private int firstrow;
    private int number;
    private int count;

    public square() {

        matrixblank=getsize();
        firstrow=0;
        number=0;
        count=0;


    }

    public int [][]getsize() {
        int rows=0;
        int f=0;
        Scanner size = new Scanner(System.in);
        //THIS SETS SIZE OF THE MATRIX 
        System.out.println("How big do you want your magic square?");
        rows=size.nextInt();
        while(rows<1){
        System.out.println("Enter an accepted value of the size of your magic square");
        rows=size.nextInt();}
            // END OF SETTING MATRIX 

        // FINDS  VALUE OF THE NUMBERS IN THE MATRIX 
        int matrix[][]= new int [rows][rows];
        for(int row=0; row<matrix.length;row++){
            for(int column=0;column<matrix[row].length;column++){
                System.out.println("Enter value for"+ row + " "+ column);
                f=size.nextInt();
                matrix[row][column]=f;
                //END OF FINDING VALUES 

        //CHECKS TO SEE IF THE VALUE IS TOO BRING OR SMALL
                while(f<1||f>matrix.length*matrix.length){
                    System.out.println("This number is too big or small please. Enter a new Number.");
                    f=size.nextInt();
                    matrix[row][column]=f;
                }
        //END OF CHECKING IF THE VALUE IS IN BOUNDS

                if(matrix[row][column]==f){
                    System.out.println("Enter a new number that hasnt been entered before");
                    f=size.nextInt();
                    matrix[row][column]=f;
                }



            }}



        return matrix;
    }


    public void sumoffirstrow() {

            for(int firstrow1=0;firstrow1<matrixblank[0].length;firstrow1++) {
                firstrow+=matrixblank[0][firstrow1];
                number=firstrow;
        }
    }


    public boolean checkrows(){

    int sumrows=0;
        for(int a=0;a<matrixblank.length;a++){
            sumrows=0;
            for(int b=0;b<matrixblank.length;b++){
                sumrows+=matrixblank[a][b];
            }
            if(sumrows!=number){
                return false;
            }
        }

        return true;
    }
        public boolean checkcolumns(){


        int sumcolumns=0;
        for(int c =0; c < matrixblank.length; c++){
              sumcolumns = 0;

         for(int d = 0; d< matrixblank.length; d++){
                  sumcolumns += matrixblank[d][c];
              }
              if(sumcolumns != number){
                  return false;
              }
        }
        return true;

        }
        public boolean TLBR(){



        int sumofLtoR;
        sumofLtoR=0;
        for(int e=0;e<matrixblank.length;e++){
            sumofLtoR+=matrixblank[e][e];
        }
        if(sumofLtoR!=number){
            return false;
        }
        return true;
        }


        public boolean TRBL(){


        int sumofRtoL;
        sumofRtoL=0;
        for(int f=0;f<matrixblank.length;f++){
            sumofRtoL+=matrixblank[f][matrixblank.length-1-f];
        }
        if(sumofRtoL!=number){
            return false;
        }

        return true;
    }


    public String getnumbers() {
        String b = "";

        for(int i = 0; i < matrixblank.length; i++){
            b +="\n";
            for(int j = 0; j < matrixblank[0].length; j++){
                b += " " + matrixblank[i][j];
            }

        }
        return b;   

    }





    public String toString() {



        if(checkrows()&&checkcolumns()&&TLBR()&&TRBL()){
            return "This is a magic square"+getnumbers();
        }

        else{


        return "This is not a magic square\n"+getnumbers();
        }
        }



        }