【发布时间】：2021-06-21 14:39:55
【问题描述】：
在我的编程课上，我被要求制作一份录取学生名单，每个学生都包含其中的信息，并显示所有录取学生的平均成绩以及他们是否被学校录取。一切正常，除了当我在程序结束时进入我的 for 循环以显示每个学生的信息及其平均值时，程序只是在显示学生的任何信息之前结束并且没有给出错误消息。
请帮忙！！
主类：
public class MainStudent {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scan = new Scanner(System.in);
List<Student> students = new ArrayList<Student>();
String FullName;
String answer;
System.out.println("Welcome! Please enroll your students");
System.out.println("");
do {
Student student = new Student();
System.out.println("Please enter the first name of the student");
student.setFirstName(scan.next());
System.out.println("");
System.out.println("Please enter the last name of the student");
student.setLastName(scan.next());
System.out.println("");
FullName = student.getFirstName() + " " + student.getLastName();
Boolean validation = false;
while (validation == false) {
System.out.println("Please enter the ID of " + FullName);
try {
student.setID(scan.nextInt());
validation = true;
}
catch(Exception e) {
System.out.println("please enter only numbers");
System.out.println("");
validation = false;
scan.next();
}
}
System.out.println("");
System.out.println("Please enter the gender of " + FullName);
student.setGender(scan.next());
System.out.println("");
System.out.println("Please enter the age of " + FullName);
student.setAge(scan.nextInt());
if (student.getAge() > 17) {
do {
System.out.println("");
System.out.println("Please enter the first score of " + FullName);
try {
student.setScore1(scan.nextInt());
if (student.getScore1() > 100 || student.getScore1() < 0) {
System.out.println("please enter a positive number below 100");
validation = false;
}
else {
validation = true;
}
}
catch (Exception e) {
System.out.println("Please only enter numbers");
validation = false;
scan.next();
}
}
while (validation == false);
System.out.println("");
do {
System.out.println("Please enter the second score of " + FullName);
try {
student.setScore2(scan.nextInt());
if (student.getScore2() > 100 || student.getScore2() < 0) {
System.out.println("please enter a positive number below 100");
validation = false;
}
else {
validation = true;
}
}
catch (Exception e) {
System.out.println("Please only enter numbers");
validation = false;
scan.next();
}
}
while (validation == false);
System.out.println("");
do {
System.out.println("Please enter the third score of " + FullName);
try {
student.setScore3(scan.nextInt());
if (student.getScore3() > 100 || student.getScore3() < 0) {
System.out.println("please enter a positive number below 100");
validation = false;
}
else {
validation = true;
}
}
catch (Exception e) {
System.out.println("Please only enter numbers");
validation = false;
scan.next();
}
}
while (validation == false);
System.out.println("");
do {
System.out.println("Please enter the fourth score of " + FullName);
try {
student.setScore4(scan.nextInt());
if (student.getScore4() > 100 || student.getScore4() < 0) {
System.out.println("please enter a positive number below 100");
validation = false;
}
else {
validation = true;
}
}
catch (Exception e) {
System.out.println("Please only enter numbers");
validation = false;
scan.next();
}
}
while (validation == false);
}
else {
System.out.println("You can not enroll a student under the age of 18");
student.setScore1(0);
student.setScore2(0);
student.setScore3(0);
student.setScore4(0);
}
System.out.println("Do you want to register another student? \n Answer with Y/N");
answer = scan.next();
}
while (answer.equals("Y") || answer.equals("y"));
for (int i = 0; i < students.size(); i++) {
System.out.println("");
System.out.println("*******************************");
System.out.println("Name: " + students.get(i).getFirstName());
System.out.println("Age: " + students.get(i).getAge() );
System.out.println("Gender: " + students.get(i).getGender());
System.out.println("Scored Average: " + students.get(i).Average(i, i, i, i));
System.out.println(students.get(i).Enrolled(i));
System.out.println("*******************************");
}
scan.close();
}
}
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标签： java list for-loop arraylist