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java - 无法让我的程序正确读入文件以执行方法

转载 作者:行者123 更新时间:2023-12-01 09:27:38 30 4
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在下面的代码中,我在让程序的每个部分运行各自的方法时遇到问题。单独测试它们,它们工作得很好。但是,我认为 fileIn.next() 没有按照我需要的方式工作来显示字母和数字,以便运行正确的语句。通常,我会收到 NoSuchElementException,但无法弄清楚需要采取哪些步骤来修复它。

编辑 1:抱歉,如果格式变得不稳定,但我添加了必须使用我提到的方法创建的类。我还注意到,在一次迭代之后,我的文件中的字母以某种方式不再出现?

    import java.util.*;

import java.io.*;

public class p2{
public static void main(String[] args) throws IOException{
Date date1 = new Date();
Date date2 = new Date();
Date date3 = new Date(5, 31, 2016);

System.out.println();
Scanner fileIn = new Scanner(new File("test1.txt"));

while (fileIn.next() != null ){
if (fileIn.next().equals("G") && fileIn.next().equals("1")){
date1.getDate();
}
if (fileIn.next().equals("G") && fileIn.next().equals("2")){
date2.getDate();
}
if (fileIn.next().equals("G") && fileIn.next().equals("3")){
date3.getDate();
}
if (fileIn.next().equals("I") && fileIn.nextInt() == 1){
date1.incrementDay();
}
if (fileIn.next().equals("I") && fileIn.nextInt() == 2){
date2.incrementDay();
}
if (fileIn.next().equals("I") && fileIn.nextInt() == 3){
date3.incrementDay();
}
if (fileIn.next().equals("D") && fileIn.nextInt() == 1){
date1.displayDate();
}
if (fileIn.next().equals("D") && fileIn.nextInt() == 2){
date2.displayDate();
}
if (fileIn.next().equals("D") && fileIn.nextInt() == 3){
date3.displayDate();
}
if (fileIn.next().equals("S") && fileIn.nextInt() == 1){
String newDate = fileIn.next();
//System.out.println("newDate: " + newDate);
int num1 = Integer.parseInt(newDate.substring(0, 2));
int num2 = Integer.parseInt(newDate.substring(3, 5));
int num3 = Integer.parseInt(newDate.substring(6, 10));
System.out.println(num1 + "/" + num2 + "/" + num3);
date1.setDate(num1, num2, num3);
}
if (fileIn.next().equals("S") && fileIn.nextInt() == 2){
String newDate = fileIn.next();
//System.out.println("newDate: " + newDate);
int num1 = Integer.parseInt(newDate.substring(0, 2));
int num2 = Integer.parseInt(newDate.substring(3, 5));
int num3 = Integer.parseInt(newDate.substring(6, 10));
System.out.println(num1 + "/" + num2 + "/" + num3);
date2.setDate(num1, num2, num3);
}
if (fileIn.next().equals("S") && fileIn.nextInt() == 3){
String newDate = fileIn.next();
//System.out.println("newDate: " + newDate);
int num1 = Integer.parseInt(newDate.substring(0, 2));
int num2 = Integer.parseInt(newDate.substring(3, 5));
int num3 = Integer.parseInt(newDate.substring(6, 10));
System.out.println(num1 + "/" + num2 + "/" + num3);
date3.setDate(num1, num2, num3);
}
if (fileIn.next().equals("Q")){
System.exit(0);
}
}

System.out.println("p2 complete");
fileIn.close();
}
}

class Date{
private int month;
private int day;
private int year;

public Date(){
this.month = 1;
this.day = 1;
this.year = 2000;
System.out.println("Empty constructor created.");
}//end Date constructor

public Date(int month, int day, int year){
this.month = month;
this.day = day;
this.year = year;
System.out.println("Overload constructor created.");
}//end Date overload constructor

public void setDate(int month, int day, int year){
//System.out.println("setDate activated: ");
this.month = month;
this.day = day;
this.year = year;
//System.out.println("setDate complete.");
}//end setDate

public void getDate(){
if (month < 10 && !(day < 10)){//if month is the only single digit int
System.out.println("getDate activated: 0" + month + "/" + day + "/" + year);
}//end if
else if (day < 10 && month > 10){//if day is the only single digit int
System.out.println("getDate activated: " + month + "/0" + day + "/" + year);
}//end else if
else if (day < 10 && month < 10){//if both month and day are single digit ints
System.out.println("getDate activated: 0" + month + "/0" + day + "/" + year);
}//end else if
else{
System.out.println("getDate activated: " + month + "/" + day + "/" + year);
}//end else
}//end getDay

public void incrementDay(){
//System.out.println("Test incrementDay: ");
int[] daysPerMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
if (year % 4 == 0){
daysPerMonth[1] = 29;
}//end if

for (int i = 0; i < 12; i++){
if (i+1 == month && day == daysPerMonth[i]){//if we find the month and day is at the end of the month
if (month == 12 && day == 31){//if we are at december 31st
month = 1;
day = 1;
year += 1;
break;
}//end
else{
month += 1;
day = 1;
break;
}//end else
}//end if
else if (i+1 == month && day < daysPerMonth[i]){
day += 1;
break;
}//end else if
else{
}//end else
}//end for

setDate(month, day, year);
System.out.print("Result of successful increment: ");
getDate();
}//end incrementDay

public void displayDate(){
System.out.print("displayDate activated: ");
System.out.println(this.month + "/" + this.day + "/" + this.year);
}
}//end Date

最佳答案

每一个 next 都会删除一个标记,因此 if (fileIn.next().equals("G") && fileIn.next().equals("1")){ 如果第一个标记等于 G 则读取两个标记,否则 if 将在第一部分失败,并且不会读取第二个 next

所以你最好将标记放入变量中,例如

String tok1 = fileIn.next ();
String tok2 = fileIn.next ();

if (tok1.equals("G") && tok2.equals("1")){

关于java - 无法让我的程序正确读入文件以执行方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39716100/

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