Problem4 sa Midterms

public static void main(String[] args) throws IOException {
        BufferedReader bfr = new BufferedReader(new InputStreamReader(System.in));
        int size;boolean flag;
        do{
        try{
            flag = true;
        do{
        System.out.print("Enter size: ");
        size = Integer.parseInt(bfr.readLine());
        }while(size<3||size>5);
        String[][] str = new String[size][size];
        String[] temp = new String[size*size];
        int tempsize = 0;
        System.out.println("Enter values: ");
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                str[i][j] = bfr.readLine();
                temp[tempsize] = str[i][j];
                tempsize++;
            }
        }
        Arrays.sort(temp);
        tempsize=0;
        System.out.println("Output");
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                str[i][j] = temp[tempsize];
                tempsize++;
                System.out.print(str[i][j]+"\t");
            }
            System.out.println("");
        }
    }catch(NumberFormatException e){
            System.out.println("Error");flag = false;
    }
        }while(flag==false);
    }