英文:
How can I find out why my Java program keeps crashing?
问题
以下是您要求的翻译内容：
我已经学习了一个星期的Java，我没有其他经验。程序一直崩溃，我希望在输入不正确时能自动再次询问。
import java.util.Scanner;public class test {public static void main(String[] args) {boolean error;Scanner scan = new Scanner(System.in);do {error = false;System.out.print("告诉我年份：");if (scan.hasNextInt()) {int jahr = scan.nextInt();scan.close();if (isLeapYear(jahr)) {System.out.println("请输入闰年");} else {System.out.println("这不是一个闰年");}} else {System.err.println("请输入整数年份！");error = true;scan.close();}} while (error);}public static boolean isLeapYear(int year) {// Task 1if (year % 400 == 0) {return true;} else if (year % 100 == 0) {return false;} else if (year % 4 == 0) {return true;}return false;}}
英文:
I have been learning Java for a week, I have no other experiences. The program keeps crashing, I would like to be automatically asked again in the event of an incorrect entry.
import java.util.Scanner;public class test {public static void main(String[] args) {boolean error;Scanner scan = new Scanner(System.in);do {error = false;System.out.print("Tell me the Year: ");if (scan.hasNextInt()) {int jahr = scan.nextInt();scan.close();if (schaltjahre(jahr)) {System.out.println("Please enter the leap year ");} else {System.out.println("It is not a leap year");}} else {System.err.println("enter an integer year!");error = true;scan.close();}}while (error);}public static boolean schaltjahre(int jahr) {// Aufgabe 1if (jahr % 400 == 0) {return true;} else if (jahr % 100 == 0) {return false;} else if (jahr % 4 == 0) {return true;}return false;}
答案1
得分: 1
你应该在循环内部实例化扫描器，并且不要在else语句中关闭它。
你的代码应该类似于这样：
public static void main(String[] args) {boolean error;Scanner scan ;do {error = false;scan = new Scanner(System.in);System.out.print("告诉我年份：");if (scan.hasNextInt()) {int jahr = scan.nextInt();scan.close();if (schaltjahre(jahr)) {System.out.println("请输入闰年");} else {System.out.println("这不是闰年");}} else {System.err.println("请输入一个整数年份！");error = true;}} while (error);}
注意：这里的翻译结果只包括代码部分的翻译，不包括问题中的内容。
英文:
You should instantiate the scanner inside the loop and don't close it in the else statement.
Your code should be something like this :
public static void main(String[] args) {boolean error;Scanner scan ;do {error = false;scan = new Scanner(System.in);System.out.print("Tell me the Year: ");if (scan.hasNextInt()) {int jahr = scan.nextInt();scan.close();if (schaltjahre(jahr)) {System.out.println("Please enter the leap year ");} else {System.out.println("It is not a leap year");}} else {System.err.println("enter an integer year!");error = true;}} while (error);}
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