为什么我的代码没有显示这 2 个 Arraylist？

Question

我需要显示一个 ArrayList，其中包含个人可能拥有的大学学位列表。

在另一个 ArrayList 中，我需要显示满足公司要求的大学学位要求的个人列表。

在循环中尝试了一个 system.out，它甚至没有访问 for 循环。

*带有for循环的2个方法在这个类的末尾

import java.util.ArrayList;

public class RecruitingCompany {


private String companyName;
private int phoneNumber;
private String address;
private ArrayList<CollegeDegree> collegeDegreeList = new ArrayList<>();
private ArrayList<Candidate> candidateList = new ArrayList<>();

private Candidate candidate;
private Requirement academicDegree;

public RecruitingCompany(){
    /*main constructor*/
}


public RecruitingCompany(String companyName, int phoneNumber, String address){
    this.companyName = companyName;
    this.phoneNumber = phoneNumber;
    this.address = address;
}

public String getCompanyName() {
    return companyName;
}

public void setCompanyName(String companyName) {
    this.companyName = companyName;
}

public int getPhoneNumber() {
    return phoneNumber;
}

public void setPhoneNumber(int phoneNumber) {
    this.phoneNumber = phoneNumber;
}

public String getAddress() {
    return address;
}

public void setAddress(String address) {
    this.address = address;
}

public ArrayList<CollegeDegree> getCollegeDegreeList() {
    return collegeDegreeList;
}

public void setCollegeDegreeList(ArrayList<CollegeDegree> collegeDegreeList) {
    this.collegeDegreeList = collegeDegreeList;
}

public ArrayList<Candidate> getCandidateList() {
    return candidateList;
}

public void setCandidateList(ArrayList<Candidate> candidateList) {
    this.candidateList = candidateList;
}

public Candidate getCandidate() {
    return candidate;
}

public void setCandidate(Candidate candidate) {
    this.candidate = candidate;
}

public Requirement getAcademicDegree() {
    return academicDegree;
}

public void setAcademicDegree(Requirement academicDegree) {
    this.academicDegree = academicDegree;
}

public String showCandidateCollegeDegrees(){
    String degree = "Candidato: " + candidate.getName() + "\n";

    for (CollegeDegree cd: this.collegeDegreeList){
        degree += cd.toString();
    }
    return degree;
}

public String selectByCollegeDegree(){
    String person = "Título: " + academicDegree.getDegree() + "\n";

    for (Candidate c: this.candidateList){
            person += c.toString();
    }
    return person;
}

}

Tester 类

public class Tester {

public static void main(String[] args) {

    AvailableJob availableJob = new AvailableJob(2005, 2011, "Contador", 444464444, "Metalco", "del poste de luz, 50m oeste", 550.000);
    Candidate candidate = new Candidate("Asdrubal", 888888888, "Asdrubal@yahoo.com", "Bachillerato"); 
    CollegeDegree collegeDegree = new CollegeDegree("Bachillerato Administracion", 2003, "Universidad Aguila Calva");
    RecruitingCompany recruitingCo = new RecruitingCompany();
    Requirement requirement = new Requirement("Bachillerato", 4);

    recruitingCo.setCandidate(candidate); 
    recruitingCo.setAcademicDegree(requirement); 
    availableJob.setRequirement(requirement);

    System.out.println(recruitingCo.showCandidateCollegeDegrees());
    System.out.println();
    System.out.println(recruitingCo.selectByCollegeDegree());
    System.out.println();
    System.out.println(availableJob.showRequirement());

    //System.out.print(recruitingCo.getCandidateList());
}

}

Answer 1

您没有将新的候选人或学位添加到数组列表中。改一下下面的方法就行了，

public void setAcademicDegree(Requirement academicDegree) {
    this.academicDegree = academicDegree;
    collegeDegreeList.add(academicDegree);
}

和

public void setCandidate(Candidate candidate) {
    this.candidate = candidate;
    candidateList.add(candidate);
}

现在，当您设置新的 Candidate 对象或 CollegeDegree 对象时，它将自动添加到列表中。

Answer 2

在您的代码中，您需要做一些更改：

1. setCollegeDegreeList()、setCandidateList() 和 setCandidate() 方法 应更改为addCollegDegree() 和addCandidate()
2. recruitingCo.setCandidate(candidate) 应替换为 recruitingCo.addCandidate(candidate);
3. 需要在main()中添加recruitingCo.addCollegeDegree(collegeDegree);；

你可以得到以下代码：

import java.util.ArrayList;

public class RecruitingCompany {


private String companyName;
private int phoneNumber;
private String address;
private ArrayList<CollegeDegree> collegeDegreeList = new ArrayList<>();
private ArrayList<Candidate> candidateList = new ArrayList<>();   
private Requirement academicDegree;

public RecruitingCompany(){
    /*main constructor*/
}


public RecruitingCompany(String companyName, int phoneNumber, String address){
    this.companyName = companyName;
    this.phoneNumber = phoneNumber;
    this.address = address;
}

public String getCompanyName() {
    return companyName;
}

public void setCompanyName(String companyName) {
    this.companyName = companyName;
}

public int getPhoneNumber() {
    return phoneNumber;
}

public void setPhoneNumber(int phoneNumber) {
    this.phoneNumber = phoneNumber;
}

public String getAddress() {
    return address;
}

public void setAddress(String address) {
    this.address = address;
}

public ArrayList<CollegeDegree> getCollegeDegreeList() {
    return collegeDegreeList;
}

public ArrayList<Candidate> getCandidateList() {
    return candidateList;
}

public void addCollegeDegree(CollegeDegree collegeDegree) {
    this.collegeDegreeList.add(collegeDegree);
}

public void addCandidate(Candidate candidate) {
    this.candidateList.add(candidate);
}

public Requirement getAcademicDegree() {
    return academicDegree;
}

public void setAcademicDegree(Requirement academicDegree) {
    this.academicDegree = academicDegree;
}

public String showCandidateCollegeDegrees(){
    String degree = "Candidato: " + candidate.getName() + "\n";

    for (CollegeDegree cd: this.collegeDegreeList){
        degree += cd.toString();
    }
    return degree;
}

public String selectByCollegeDegree(){
    String person = "Título: " + academicDegree.getDegree() + "\n";

    for (Candidate c: this.candidateList){
            person += c.toString();
    }
    return person;
}

}

测试人员：

public class Tester {

public static void main(String[] args) {

    AvailableJob availableJob = new AvailableJob(2005, 2011, "Contador", 444464444, "Metalco", "del poste de luz, 50m oeste", 550.000);
    Candidate candidate = new Candidate("Asdrubal", 888888888, "Asdrubal@yahoo.com", "Bachillerato"); 
    CollegeDegree collegeDegree = new CollegeDegree("Bachillerato Administracion", 2003, "Universidad Aguila Calva");
    RecruitingCompany recruitingCo = new RecruitingCompany();
    Requirement requirement = new Requirement("Bachillerato", 4);

    recruitingCo.addCandidate(candidate); 
    recruitingCo.addСollegeDegree(collegeDegree); 

    recruitingCo.setAcademicDegree(requirement); 
    availableJob.setRequirement(requirement);

    System.out.println(recruitingCo.showCandidateCollegeDegrees());
    System.out.println();
    System.out.println(recruitingCo.selectByCollegeDegree());
    System.out.println();
    System.out.println(availableJob.showRequirement());

    //System.out.print(recruitingCo.getCandidateList());
}

}