0
私はIntegers.txtファイルからIntegerをフェッチするためにScannerクラスを使用しています。 バグは、配列で正確な整数を取得していないことです。私はゼロだけを得る。最小値を見つけようとすると集計は正しくなりますが、最小値として0が得られます。私は間違って何をしていますか？Java：テキストファイルから整数を取り出した後にスキャナがゼロを示します
これはコードである：
/**
* Program to take various integers from users as input and stores them
in file called "Integers.txt"
* (a) The process should continue until user enters -9999 as input
* (b) Calculate summation of all the numbers available in Integers.txt
* (c) Find Maximum & Minimum Numbers from File
* (d) Sort the numbers available in the Integers.txt into
"SortedIntegers.txt"
* (e) Sort the Integers.txt file
**/
import java.util.*;
import java.io.*;
class Exercise8{
public static void main(String args[]){
Scanner scan = new Scanner(System.in);
// Code snippet to create a file named Integers.txt
try{
File integerFile = new File("Integers.txt");
integerFile.createNewFile();
}catch(Exception e){
}
int choice = 0;
do{
System.out.println("\nSelect an Operation: ");
System.out.println("(1) Input Integers in Integers.txt");
System.out.println("(2) Calculate sum of all the numbers available in Integers.txt");
System.out.println("(3) Find Maximum & Minimum of Numbers from File");
System.out.println("(4) Sort the Integers.txt");
System.out.println("(5) Sort the Numbers into SortedIntegers.txt");
try{
System.out.print("\nEnter Choice: ");
choice = scan.nextInt();
switch(choice){
case 1:
try{
FileWriter fstreamIntegers = new FileWriter("Integers.txt");
BufferedWriter outIntegers = new BufferedWriter(fstreamIntegers);
//Scanner scan = new Scanner(System.in);
System.out.print("How many numbers do you want to enter?: ");
int num = scan.nextInt();
String integers[] = new String[num+1];
for(int i = 0; i < integers.length; i++){
integers[i] = scan.nextLine();
outIntegers.write(integers[i]+"\n");
}
outIntegers.close();
}catch(IOException e){
e.printStackTrace();
}
break;
case 2:
try{
File integerFile = new File("Integers.txt");
Scanner inFile = new Scanner(integerFile);
//int size = inFile.nextInt();
int[] arrIntegers = new int[(int)integerFile.length()];
int i = 0;
while(inFile.hasNextInt()){
arrIntegers[i++] = inFile.nextInt();
/*inFile.next();
if(inFile.hasNextInt()){
}*/
}
int sum = 0;
for(int j = 0; j < arrIntegers.length; j++){
System.out.println(arrIntegers[j]);
sum += arrIntegers[j];
}
System.out.println("\nSum of the integers present in Integers.txt is " + sum);
}catch(Exception e){
}
break;
case 3:
try{
File integerFile = new File("Integers.txt");
Scanner inFile = new Scanner(integerFile);
int[] arrIntegers = new int[(int)integerFile.length()];
int i = 0;
while(inFile.hasNextInt()){
arrIntegers[i++] = inFile.nextInt();
/*if(!inFile.hasNextInt()){
inFile.next();
}*/
}
int max = arrIntegers[0];
for(int j = 0; j < arrIntegers.length; j++){
if(max < arrIntegers[j]){
max = arrIntegers[j];
}
}
System.out.println("\nMaximum number out of numbers present in Integers.txt is " + max);
int min = arrIntegers[0];
for(int j = 0; j < arrIntegers.length; j++){
if(min > arrIntegers[j]){
min = arrIntegers[j];
}
}
System.out.println("\nMinimum number out of numbers present in Integers.txt is " + min);
}catch(Exception e){
}
break;
default:
if(choice == -9999){
}else{
System.out.println("\n*****Enter Valid Choice!*****");
}
}
}catch(InputMismatchException e){
System.out.print("\n*****Enter Valid Choice!*****");
scan.next();
}
}while(choice != -9999);
scan.close();
}
}
これはIntegers.txtは
1
2
3
4
5
出力ファイルである：
ありがとうございました！ちょうど変わった。 – Rachit