我的psvm类不运行其他类和方法
我的psvm类不运行其他类和方法
提问于 2015-05-21 09:04:46
我的程序没有运行。这一定是因为调用了我的psvm中的类。
我已经插入了我的主类，我希望使用以下方法运行这个类。它运行程序，但是没有激活类:带其方法的课程。
public class main {
public static void main(String[] args) {
Course task1 = new Course();
task1.Assignment1();
}}另一班
public class Course {
CourseGrades[] course;
public void Assignment1() {
Scanner sc = new Scanner(System.in);
System.out.println("Welcome to students database");
System.out.println("Enter a to enter a student");
char choice = sc.next().charAt(0);
if (choice > 'z' || choice > 'a') {
System.out.println("Invalid choice");
} else {
switch (choice) {
case 'a':
numbers();
break;
case 'b':
entering();
break;
case 'c':
printCourse();
break;
}
}
}
public void numbers() {
System.out.println("Enter how many courses taken ");
Scanner numbers = new Scanner(System.in);
int courses = numbers.nextInt();
CourseGrades[] course = new CourseGrades[courses];
}
public void entering() {
for (int i = 0; i < course.length; i++) {
System.out.println("Enter coursename");
Scanner sc = new Scanner(System.in);
sc = new Scanner(System.in);
String courseName = sc.nextLine();
course[i] = new CourseGrades();
course[i].setName(courseName);
System.out.println("Enter grade");
Scanner grade = new Scanner(System.in);
course[i].setGrade(i);
}
}
public void printCourse() {
System.out.println("Printing out courses and grades");
for (int i = 0; i < course.length; i++) {
System.out.println(" name 2" + course[i].getName() + " grade" + course[i].getGrade());
}
}
}Getter和setter
public class CourseGrades {
private String name;
private int grade;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getGrade() {
return grade;
}
public void setGrade(int grade) {
this.grade = grade;
}
}Stack Overflow用户
回答已采纳
发布于 2015-05-21 09:36:32
如果代码中有多个类，那么应该始终与具有main()方法(在本例中为Main.java)的类一起保存，而且该类应该只包含公共访问说明符。我在IDE中运行相同的代码。我正在IDE中成功运行您的代码：
见守则：
public class Main {
public static void main(String[] args) {
Course task1 = new Course();
task1.Assignment1();
}
}
// The other class
class Course {
CourseGrades[] course;
public void Assignment1() {
Scanner sc = new Scanner(System.in);
System.out.println("Welcome to students database");
System.out.println("Enter a to enter a student");
char choice = sc.next().charAt(0);
if (choice > 'z' || choice > 'a') {
System.out.println("Invalid choice");
} else {
switch (choice) {
case 'a':
numbers();
break;
case 'b':
entering();
break;
case 'c':
printCourse();
break;
}
}
}
public void numbers() {
System.out.println("Enter how many courses taken ");
Scanner numbers = new Scanner(System.in);
int courses = numbers.nextInt();
CourseGrades[] course = new CourseGrades[courses];
}
public void entering() {
for (int i = 0; i < course.length; i++) {
System.out.println("Enter coursename");
Scanner sc = new Scanner(System.in);
sc = new Scanner(System.in);
String courseName = sc.nextLine();
course[i] = new CourseGrades();
course[i].setName(courseName);
System.out.println("Enter grade");
Scanner grade = new Scanner(System.in);
course[i].setGrade(i);
}
}
public void printCourse() {
System.out.println("Printing out courses and grades");
for (int i = 0; i < course.length; i++) {
System.out.println(" name 2" + course[i].getName() + " grade" + course[i].getGrade());
}
}
}
// Getters and setters
class CourseGrades {
private String name;
private int grade;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getGrade() {
return grade;
}
public void setGrade(int grade) {
this.grade = grade;
}
} 结果：
Welcome to students database
Enter a to enter a student
a
Enter how many courses taken
3页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/30369172
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