代码在这里：http://pastie.org/8490904
public class Project5_test {
static void main(String[] args) {
Scanner input = new Scanner(System.in);
// initialize an arary that holds N objects of type Student
int end = 1;
ArrayList<Student> studentList = new ArrayList<Student>();
ArrayList<Student> removeArray = new ArrayList<Student>();
// read in the data
for (int y = 0; y < end;) {
String nextMove = nextMove();
for (int i = 0; i < end;) {
if ("add".equalsIgnoreCase(nextMove)) {
System.out.println("Student Input: ");
String firstName = getFirstName();
String lastName = getLastName();
int uid = getUid();
StudentType type = inputStudentType();
Student base = new Student(firstName, lastName, uid, type);
if (type == StudentType.UNDECLARED) {
ClassStanding standing = inputClassStanding();
studentList.add(base);
} else if (type == StudentType.UNDERGRADUATE) {
ClassStanding standing = inputClassStanding();
Major major = inputMajor();
double overallGpa = getOverallGPA();
String overallGpaDouble = Double.toString(overallGpa);
double majorGpa = getOverallGPA();
String majorGpaDouble = Double.toString(majorGpa);
studentList.add(new Student.UnderGraduate(
new Student(firstName, lastName, uid, type),
major, overallGpa, majorGpa, standing));
} else if (type == StudentType.GRADUATE) {
boolean thesis = getThesisStatus();
ClassStanding studyType = getStudy();
String profName = getProfName();
studentList.add(new Student.Graduate(
new Student(firstName, lastName, uid, type),
thesis, studyType, profName));
}
}
i++;
}
if ("remove".equalsIgnoreCase(nextMove)) {
int removeUid = getRemoveUid();
removeArray = remove(studentList, removeUid);
for (int i = 0; i < removeArray.size(); i++) {
System.out.println(removeArray.get(i));
}
}
if ("save".equalsIgnoreCase(nextMove)) {
for (int i = 0; i < removeArray.size(); i++) {
System.out.println(removeArray.get(i));
}
y++;
}
}
}
enum ClassStanding {
FRESHMAN, SOPHOMORE, JUNIOR, SENIOR, UNKNOWN,
MASTERS_STUDIES, PHD_STUDIES, NO_STANDING
};
enum StudentType {
UNDERGRADUATE, GRADUATE, UNDECLARED
};
enum Major {
CS, CEG, EE, ISE, BME, ME, MET, UNKNOWN
};
public static class Student {
public String firstName; // first name
public String lastName;
public double uid; // last name
public StudentType type;
public Student(Student orig) {
this.firstName = orig.firstName;
this.lastName = orig.lastName;
this.uid = orig.uid;
this.type = orig.type;
}
// construct a new student with given fields
public Student(String firstName, String lastName, Integer newUid, StudentType type) {
this.firstName = firstName;
this.lastName = lastName;
this.uid = newUid;
this.type = type;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getFirstName() {
return firstName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getLastName() {
return lastName;
}
//set type
public void setType(StudentType type) {
this.type = type;
}
//return type
public StudentType getType() {
return type;
}
// return a string representation of the invoking object
public String toString() {
return firstName + " " + lastName + " " + uid + " " + type;
}
public static class Graduate extends Student {
public boolean thesis;
public ClassStanding study;
public String profName;
public Graduate(Student orig, boolean isThesis, ClassStanding study, String profName) {
super(orig);
thesis = isThesis;
this.study = study;
this.profName = profName;
}
public boolean getThesis() {
return thesis;
}
public void setThesis(Boolean thesis) {
this.thesis = thesis;
}
public ClassStanding getStudy() {
return study;
}
public void setStudy(ClassStanding study) {
this.study = study;
}
public String getProfName() {
return profName;
}
public void setProfName(String profName) {
this.profName = profName;
}
public String toString() {
return super.toString() + thesis + " " + study + " " + profName;
}
}
public static class UnderGraduate extends Student {
public Major major;
public Double overallGpa;
public Double majorGpa;
public ClassStanding study;
public UnderGraduate(Student orig, Major major, Double overallGpa, Double majorGpa, ClassStanding study) {
super(orig);
this.study = study;
this.major = major;
this.overallGpa = overallGpa;
this.majorGpa = majorGpa;
}
public void setMajor(Major major) {
this.major = major;
}
//return type
public Major getmMajor() {
return major;
}
public void setOverallGPA(Double overallGpa) {
this.overallGpa = overallGpa;
}
public Double getOverallGPA() {
return overallGpa;
}
public void setMajorGPA(Double majorGpa) {
this.majorGpa = majorGpa;
}
public Double getMajorGPA() {
return majorGpa;
}
public ClassStanding getStudy() {
return study;
}
public void setStudy(ClassStanding study) {
this.study = study;
}
public String toString() {
return study + " " + major + " " + overallGpa + " " + majorGpa;
}
}
}
public static String getFirstName() {
Scanner input = new Scanner(System.in);
String firstName;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Please enter the students first name: ");
firstName = input.next();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a string please enter another first name!");
input.next();
continue;
}
}
return firstName;
}
public static String getLastName() {
Scanner input = new Scanner(System.in);
String lastName;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Please enter a students last name: ");
lastName = input.next();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a string please enter another last name!");
input.next();
continue;
}
}
return lastName;
}
public static Integer getUid() {
Scanner input = new Scanner(System.in);
int uid;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Please enter a uid number: ");
uid = input.nextInt();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a number or an integer!");
input.next();
continue;
}
}
return uid;
}
public static StudentType inputStudentType() {
Scanner input = new Scanner(System.in);
String type;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Is the student a graduate, undergraduate, or, undeclared: ");
type = input.next();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("False input. Is the student a graduate, undergraduate, or, undeclared: ");
type = input.next();
continue;
}
}
if ("undergraduate".equalsIgnoreCase(type)) {
StudentType status = StudentType.UNDERGRADUATE;
return status;
}
if ("graduate".equalsIgnoreCase(type)) {
StudentType status = StudentType.GRADUATE;
return status;
}
if ("undeclared".equalsIgnoreCase(type)) {
StudentType status = StudentType.UNDECLARED;
return status;
}
return null;
}
public static String nextMove() {
Scanner input = new Scanner(System.in);
String nextMove;
while (true) {
// prompt the user to enter if there are more characers
try {
System.out.print("What now? Add, Sort, Remove, Save: ");
nextMove = input.next();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("More input? true or false(type true or false): ");
input.next();
continue;
}
}
return nextMove;
}
public static ClassStanding inputClassStanding() {
Scanner input = new Scanner(System.in);
String type;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Enter the students class standing: ");
type = input.next();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("False input. Input the students class standing: ");
type = input.next();
continue;
}
}
if ("Freshman".equalsIgnoreCase(type)) {
ClassStanding standing = ClassStanding.FRESHMAN;
return standing;
}
if ("sophomore".equalsIgnoreCase(type)) {
ClassStanding standing = ClassStanding.SOPHOMORE;
return standing;
}
if ("junior".equalsIgnoreCase(type)) {
ClassStanding standing = ClassStanding.JUNIOR;
return standing;
}
if ("senior".equalsIgnoreCase(type)) {
ClassStanding standing = ClassStanding.SENIOR;
return standing;
}
if ("unknown".equalsIgnoreCase(type)) {
ClassStanding standing = ClassStanding.UNKNOWN;
return standing;
}
return null;
}
public static Major inputMajor() {
Scanner input = new Scanner(System.in);
String major;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Enter the students major (CS, CEG, EE, ISE, BME, ME, MET, UNKNOWN): ");
major = input.next();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("False input. Enter the students major (CS, CEG, EE, ISE, BME, ME, MET, UNKNOWN): ");
major = input.next();
continue;
}
}
if ("cs".equalsIgnoreCase(major)) {
Major finalMajor = Major.CS;
return finalMajor;
}
if ("ceg".equalsIgnoreCase(major)) {
Major finalMajor = Major.CEG;
return finalMajor;
}
if ("ee".equalsIgnoreCase(major)) {
Major finalMajor = Major.EE;
return finalMajor;
}
if ("ise".equalsIgnoreCase(major)) {
Major finalMajor = Major.ISE;
return finalMajor;
}
if ("bme".equalsIgnoreCase(major)) {
Major finalMajor = Major.BME;
return finalMajor;
}
if ("ME".equalsIgnoreCase(major)) {
Major finalMajor = Major.ME;
return finalMajor;
}
if ("met".equalsIgnoreCase(major)) {
Major finalMajor = Major.MET;
return finalMajor;
}
if ("unknown".equalsIgnoreCase(major)) {
Major finalMajor = Major.UNKNOWN;
return finalMajor;
}
return null;
}
public static Double getOverallGPA() {
Scanner input = new Scanner(System.in);
double overallGpa;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Please enter the students overall GPA: ");
overallGpa = input.nextDouble();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a number or an integer! Please enter the students overall GPA:");
input.next();
continue;
}
}
return overallGpa;
}
public static Double getMajorlGPA() {
Scanner input = new Scanner(System.in);
double majorGpa;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Please enter the students major GPA: ");
majorGpa = input.nextDouble();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a number or an integer! Please enter the students major GPA:");
input.next();
continue;
}
}
return majorGpa;
}
public static boolean getThesisStatus() {
Boolean thesis;
Scanner input = new Scanner(System.in);
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Enter TRUE for having a thesis option else FALSE: ");
thesis = input.nextBoolean();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a boolean response. True or false, is there a thesis: ");
input.next();
continue;
}
}
return thesis;
}
public static ClassStanding getStudy() {
String study = null;
Scanner input = new Scanner(System.in);
for (int i = 0; i < 1;) {
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Enter Masters for Master Studies or Phd for Phd studies: ");
study = input.next();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a valid response. Enter Masters for Master Studies or Phd for Phd studies: ");
input.next();
continue;
}
}
if ("masters".equalsIgnoreCase(study)) {
ClassStanding standing = ClassStanding.MASTERS_STUDIES;
return standing;
}
if ("phd".equalsIgnoreCase(study)) {
ClassStanding standing = ClassStanding.PHD_STUDIES;
return standing;
}
}
return null;
}
public static String getProfName() {
String name;
Scanner input = new Scanner(System.in);
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Enter the name of the major professor: ");
name = input.next();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a valid response. Enter the name of the major professor: ");
input.next();
continue;
}
}
return name;
}
public static int getRemoveUid() {
Scanner input = new Scanner(System.in);
int removeUid;
while (true) {
//prompt the user to enter the popularity number for each character
try {
System.out.print("Please enter a uid number to be removed: ");
removeUid = input.nextInt();
break;
//error handling
} catch (InputMismatchException e) {
System.out.println("Not a number or an integer!");
input.next();
continue;
}
}
return removeUid;
}
public static ArrayList<Student> remove(ArrayList<Student> array, Integer uid) {
for (int i = 0; i < array.size(); i++) {
array.get(i);
if (i == uid) {
array.remove(i);
break;
}
}
return array;
}
}
给出了删除函数的学生uid编号，将删除具有该编号的该学生的整个arrayList。 例如：derp lerp 222未定的新生 如果删除下一个动作并且用户输入222 结果:(不再是给定uid号码的学生）
代码末尾的方法remove（）;是固定的，可能的 if（“remove”.equalsIgnoreCase（nextMove））在main方法
中当我执行我的代码时，使用remove（）方法
后数组保持不变答案 0 :(得分：2)
使用remove方法
public static ArrayList<Student> remove(ArrayList<Student> array, Integer uid) {
for (int i = 0; i < array.size(); i++) {
array.get(i);
if (i == uid) {
array.remove(i);
break;
}
}
return array;
}
您要将i与uid进行比较，同时应将学生ID与uid进行比较。尝试类似这样的事情（getID将是返回学生ID的方法。如果你没有，那么你应该创建它。）
for (int i = 0; i < array.size(); i++) {
if (uid.equals(array.get(i).getID())) {//I am using equals since uid is Object
//and I want to compare its value, not
//reference
array.remove(i);
break;
}
}