如何从文件中的一行读取单词和整数

Question

I have a code here:-

package testFiles;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.Scanner;

public class ReadFile {
public static void main(String[] args){
    FileReader in=null;
    FileWriter out=null;
    String line;
    File fp=new File("readFrom.txt");
    try {
        Scanner sc=new Scanner(fp);
        //System.out.println(sc.next());
        if(sc.next().contentEquals("Coding")){
            System.out.println("####");
            while(sc.next().contentEquals("\n")==false){
                if(sc.nextInt()==1){
                    System.out.println("Coding is set.");
                }
                else{
                    System.out.println("Coding is not set.");
                }
            }
        }
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}
}

What i intent to do :I want to read a word from the file say "Coding". There will an integer after a space after this word.ie. the file would be: Coding 1 On reading 'Coding' the program should read the corresponding number and return 'set' if the number is 1,and 'not set' if the number is not 1.

My problem: I can read the string and verify if it's Coding.But i cant get the number.

what i want :I want the program to read the string and also the number corresponding and return statements based on the conditions.Remember the word "Coding" and the number are in the same line. Please Guide me.

Answer 1

You should add sc.hasNext(); to your while condition. sc.next(); will read next value and you will lose it while checking your condition. I also add some suggestions about stream close operation on finally .

Code at the below prints:

Coding
Coding is set.

"readFrom.txt" has text: "Coding 1"

public static void main(String[] args) {

    FileReader in = null;
    FileWriter out = null;
    File fp = new File("D:/readFrom.txt");
    Scanner sc = null;
    try {
        sc = new Scanner(fp);
        String str = "";
        while (sc.hasNext()) {
            str = sc.next();
            if (str.contentEquals("Coding")) {
                System.out.println(str);
                if (sc.nextInt() == 1) {
                    System.out.println("Coding is set.");
                } else {
                    System.out.println("Coding is not set.");
                }
            }
        }
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {

        try {
            if (out != null)
                out.close(); // you should close it on finally
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            if (in != null)
                in.close(); // you should close it on finally
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            if (sc != null)
                sc.close(); // you should close it on finally
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

Answer 2

Sample Code

    while(sc.hasNext()){
        try{
           String str = sc.nextLine();
           String strArray[] = str.split(" ");
           if ( strArray.length > 1 &&  strArray[0].equals("Coding")){
               int count = Integer.parseInt(strArray[1]);
               // check for count value == 1 or  not and do processing
               if ( count == 1){
                    System.out.println("Coding set");
               }else{
                   System.out.println("Coding not set");
               }
           }else{
                System.out.println("Coding not set");
           }
         }catch(Exception err){
             err.printStackTrace();
         }
    }