线程“main”中的异常java.util.NoSuchElementException错误
我在以下任务中遇到问题:
“编写一个程序,以日月年(8 23 2000)的形式接受任意两个日期,用空格分隔,并计算两个日期之间的总天数,包括开始日期和结束日期。闰年是可以被4除尽的一年,除了百年以外,必须可以被400整除,比如1600或2000(1800不是闰年),你可以用任何输入的日期(或存储的日期在一个文件中),但最终必须运行下面显示的数据,屏幕上的系统输出是可以接受的。“
到目前为止我有这个代码,它编译:
import java.util.Scanner;
import java.io.*;
public class Project3
{
public static void main(String[] args) throws IOException
{
int m1, d1, y1, m2, d2, y2;
Scanner scan = new Scanner(new FileReader("dates.txt"));
for(int i = 0 ; i < 6; ++i)
{
m1 = scan.nextInt();
d1 = scan.nextInt();
y1 = scan.nextInt();
m2 = scan.nextInt();
d2 = scan.nextInt();
y2 = scan.nextInt();
System.out.println("The total number of days between the dates you entered are: " + x(m1, m2, d1, d2, y1, y2));
}
}
public static int x (int m1, int d1, int y1, int m2, int d2, int y2)
{
int total = 0;
int total1 = 0;
int total2 = 0;
if( m1 == m2 && y1 == y2)
{
total = d2 - d1 +1;
}
else if ( y1 == y2 )
{
total = daysInMonth( m2 , y2 ) - d1 + 1;
}
for(int i = m1; i < m2 ; ++i)
{
total1 += daysInMonth( m2, y2 );
}
for (int i = y1; i < y2; i++)
{
total2 += daysInYear ( y2 );
}
total += total1 + total2;
return total;
}
//Methods
public static boolean isLeap(int yr)
{
if(yr % 400 == 0)
return true;
else if (yr % 4 == 0 && yr % 100 !=0)
return true;
else return false;
}
public static int daysInMonth( int month , int year)
{
int leapMonth;
if (isLeap(year) == true)
{
leapMonth = 29;
}
else
{
leapMonth = 28;
}
switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12: return 31;
case 4:
case 6:
case 9:
case 11: return 30;
case 2: return leapMonth;
}
return 28;
}
public static int daysInYear(int year)
{
if (isLeap(year))
return 366;
else
return 365;
}
}
我遇到的问题是我输出的数据文件中的日期不正确。 我输入这两个日期7 4 1776
和1 1 1987
并得到723795
而不是正确答案76882
。 我输入的任何其他日期,他们也是不正确的。
这也是我得到的错误。
您输入的日期之间的总天数为:723795
线程“main”java.util.NoSuchElementException中的异常
在java.util.Scanner.throwFor(Scanner.java:862)
在java.util.Scanner.next(Scanner.java:1485)
在java.util.Scanner.nextInt(Scanner.java:2117)
在java.util.Scanner.nextInt(Scanner.java:2076)
在Project3.main(Project3.java:15)
数据文件:
7
4
1776
1
1
1987
请任何帮助,非常感谢!
首先,当你调用函数x时,你以错误的顺序传递参数。 该函数被声明为x(m1,d1,y1,m2,d2,y2),但是您要调用x(m1,m2,d1,d2,y1,y2)。 这很难发现。 :)
另外,我已经根据您的原始代码清理了代码。 请注意,您需要在循环中使用变量“i”而不是“y1”或“m2”
例如,
for(int i = m1; i < m2 ; ++i)
{
total1 += daysInMonth( m2, y2 );
}
这段代码没有意义。 你想使用daysInMonth(i,y2);
这是我的建议:
public static void main(String[] args) throws IOException
{
int m1, d1, y1, m2, d2, y2;
Scanner scan = new Scanner(new FileReader("dates.txt"));
for(int i = 0 ; i < 6; ++i)
{
m1 = scan.nextInt();
d1 = scan.nextInt();
y1 = scan.nextInt();
m2 = scan.nextInt();
d2 = scan.nextInt();
y2 = scan.nextInt();
System.out.println("The total number of days between the dates you entered are: " + x(m1, d1, y1, m2, d2, y2));
}
}
public static int x (int m1, int d1, int y1, int m2, int d2, int y2) {
int total = 0;
total = d2 - d1 + 1;
if (y1 == y2) {
for(int i = m1; i < m2 ; ++i) {
total += daysInMonth(i, y2);
}
} else {
for (int i = m1; i <= 12; i++) {
total += daysInMonth(i, y1);
}
for (int i = y1+1; i < y2; i++) {
total += daysInYear(i);
}
for (int i = 1; i < m2 ; i++) {
total += daysInMonth(i, y2);
}
}
return total;
}
结果是:
java Project3
The total number of days between the dates you entered are: 76882
这是整个代码:
import java.util.Scanner;
import java.io.*;
public class Project3
{
public static void main(String[] args) throws IOException
{
int m1, d1, y1, m2, d2, y2;
Scanner scan = new Scanner(new FileReader("dates.txt"));
for(int i = 0 ; i < 6; ++i)
{
m1 = scan.nextInt();
d1 = scan.nextInt();
y1 = scan.nextInt();
m2 = scan.nextInt();
d2 = scan.nextInt();
y2 = scan.nextInt();
System.out.println("The total number of days between the dates you entered are: " + x(m1, d1, y1, m2, d2, y2));
}
}
public static int x (int m1, int d1, int y1, int m2, int d2, int y2) {
int total = 0;
total = d2 - d1 + 1;
if (y1 == y2) {
for(int i = m1; i < m2 ; ++i) {
total += daysInMonth(i, y2);
}
} else {
for (int i = m1; i <= 12; i++) {
total += daysInMonth(i, y1);
}
for (int i = y1+1; i < y2; i++) {
total += daysInYear(i);
}
for (int i = 1; i < m2 ; i++) {
total += daysInMonth(i, y2);
}
}
return total;
}
//Methods
public static boolean isLeap(int yr)
{
if(yr % 400 == 0)
return true;
else if (yr % 4 == 0 && yr % 100 !=0)
return true;
else return false;
}
public static int daysInMonth( int month , int year)
{
int leapMonth;
if (isLeap(year) == true)
{
leapMonth = 29;
}
else
{
leapMonth = 28;
}
switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12: return 31;
case 4:
case 6:
case 9:
case 11: return 30;
case 2: return leapMonth;
}
return 28;
}
public static int daysInYear(int year)
{
if (isLeap(year))
return 366;
else
return 365;
}
}
链接地址: http://www.djcxy.com/p/96117.html
上一篇: Exception in thread "main" java.util.NoSuchElementException Error
下一篇: How can i insert multiple input in one line in 2dArray looping