Why program is giving trouble

Question

error which am getting is
found : int
required: java.lang.String
String noStr =System.in.read();
^
Ass1.java:31: operator || cannot be applied to java.lang.String,java.lang.String
if(op.equalsIgnoreCase("T" || "t"))
^
Note: Ass1.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
3 errors
for code
import java.util.Random;
import java.io.*;
import java.util.Scanner;
class Ass1
     public static void main(String args[]) throws IOException
          int arr [], i, j, count=0, no ;
          System.out.println("HIT3037 Assignment 1 Sudoku");
        System.out.println("Author :Ameya Agashe Id:5398541");
          System.out.println("What option?");
          System.out.println("\t G - Generate sudoku");
          System.out.println("\t T - Test solution");
          System.out.println("\t Select one option:");
          Scanner  os= new Scanner(System.in);
          String  op = os.nextLine();
          if(     op.equalsIgnoreCase("G"||"g"))
               System.out.println("Generate Sudoku");
               System.out.println("How many numbers to generate , plz g
               String noStr =System.in.read();
               no =Integer.parseInt(noStr);
               System.out.println("The no entered was" + no);
          else
          if(op.equalsIgnoreCase("T" || "t"))
                         System.out.println(" Test the Sudoku");
                         System.out.println("Please enter the file name")
                         Scanner of=new Scanner(System.in);
                         String fn= of.nextLine();
                         System.out.println("The Name of file entered by
                              //     fn = fn.trim();          
                    String line;      String[] full=new String[10];
                         FileInputStream fis=new FileInputStream(fn);
                    DataInputStream input= new DataInputStream(fis);     
                         while((line= input.readLine())!=null)
                              System.out.println(line);
                              count++;
                         full[count]=line;
}

Answer 1

yeah what if user gives input as "t" instead of "t"
so i made use of orWhat do you think equalsIgnoreCase is for? "T".equalsIgnoreCase("t") returns true
same applies to t also and the logic for conversion
from string to integer seems okObviously it's not okay.
but still why
compiler gives error as i am taking input in string
format and trying to change string to integerThat's why. You can't do int i = "5"; Strings are not ints and vice versa. Integer.parseInt is how you turn a String into an int.
But you probably have a different problem. It's not likely you want to use the read() method. You should use a BufferedReader and readLine, or Scanner.nextInt.
>
where i need to rectify my code if u run this code
for otion g it works but not for t ,this is recent
development