java - Java 中的 Get 和 set 方法出现问题

Question

我在从数组获取方法时遇到问题。

public class Person 
{



    private String navn; 
    private int personNummer;
    private int alder;

    public Person (String navn, int personNummer, int alder)
    {
        this.navn = navn;
        this.personNummer = personNummer;
        this.alder = alder;

        }
       public static String getName(Person a){
            return a.navn;        


       }  
    }


    public class Kunderegister {
        private Scanner input;
        private Person [] brukere;
    int i = 0;

    public Kunderegister () 
    {
        input = new Scanner(System.in);
        brukere = new Person [20];
    }
    public void leggTilBruker()
    {
     System.out.println("give the name"); 
        System.out.println("Give name");
        String name = input.nextLine();
        System.out.println("Give age");
        int age = input.nextInt();
        System.out.println("Give number");
        int number = input.nextInt();
        Person a = new Person(name,number,age);
        brukere[i]=a;
        i++;

    }
    public void visPersonListe()
    {
      for (int j = 0; j > 20; j++){
            System.out.println(Person.getName(brukere[0]));

        }
    }

因此，当我运行此代码时，它没有构建错误，但它不会打印出客户的姓名。知道我做错了什么吗？

Answer 1

你的循环条件是

for (int j = 0; j > 20; j++){
    System.out.println(Person.getName(brukere[0]));

更改 j > 20至j < 20循环中的条件以及 brukere[0] 的索引至brukere[j] .

还有

You don't need to pass Person object to the getter, the information you need is already there. Simply return Person.getName(brukere[j]);

将其更改如下或类似的内容:-

for (int j = 0; j < 20; j++){
    System.out.println(Person.getName(brukere[j]));