尝试调用Java方法中的类的部分时出错

Question

我差一点就要完成这项任务了，但我遇到了一个障碍。由于某些原因，我无法在我的方法中获得类的调用方面。有人有办法做到这一点吗？我已经在我所指的三个部分旁边发表了评论。我不知道是什么导致了这些错误，我非常感谢您的帮助。

public class Main
{
  public static int w = -1;
  public static int x = 0;
  public static int y = 0;
  public static int z = 0;
  public static String[] names;
  public static int[] years;
  public static String[] studios;
    public static class Movie{
    // instance variables
    private int year;
    private String title;
    private String studio;
    private int placement;
    // Constructor for objects of class Movie
    Movie(String title, int year, String studio)
    {
        // initialize instance variables
        this.title = title;
        this.year = year;
        this.studio = studio;
    }

    public String getTitle()
    {
        return title;
    }
    
    public void setTitle(String title)
    {
        this.title = title;
    }
    public void setPlacement() {
      w+=1;
      this.placement = w;
    }
      public int getPlacement() {
        return placement;
      }
    public String getStudio()
    {
        return studio;
    }
    
    public void setStudio(String studio)
    {
        this.studio = studio;
    }
    
    public int getYear()
    {
        return year;
    }
   
    public void setYear(int year)
    {
        this.year = year;
    }
   
    public String toString()
    {
        String str = String.format("%-30s %4d   %-20s", title, year, studio);
        return str;
    }
    }
    
    public static void arrNames(String name) {
      x+=1;
      names = new String[x];
      names[(x-1)] = name.getTitle(); //error here, why can't I just use getTitle()?
    }
    public static void arrYear(String name) {
      y+=1;
      years = new int[y];
      years[(y-1)] = name.getYear(); //same error
    }
    public static void arrStudio(String name) {
      z+=1;
      studios = new String[z];
      studios[z-1] = name.getStudio(); //same error
    }
  public static void setGroup(String name) {
      arrNames(name);
      arrYear(name);
      arrStudio(name);
    }
    public static void getGroups(String name) {
      int a = x;
      int b = y;
      int c = z;
      int d = 0;
      int e = 0;
      int f = 0;
      System.out.println("Names Category:  ");
      while (a > 0) {
        System.out.print(names[d] + "  ");
        d+=1;
        a-=1;
        }
      System.out.println("Years Category:  ");
      while (b > 0) {
        System.out.print(years[e] + "  ");
        e+=1;
        b-=1;
      }
      System.out.println("Studios Category:  ");
      while (c > 0) {
        System.out.print(studios[f] + "  ");
        f+=1;
        c-=1;
      }
    
  public static void main(String[] args) {
    Movie nemo = new Movie("Finding Nemo",2003,"Pixar");
    setGroup(nemo.getTitle());
    }
}

Answer 1

我将举这个例子：

 public static void arrYear(String name) {
  y+=1;
  years = new int[y];
  years[(y-1)] = name.getYear(); //same error
}

您试图对变量名使用getYear方法，而该名称是一个字符串，而不是一个电影对象。您可以将参数从字符串替换为电影，如下所示：

 public static void arrYear(Movie name) {
  y+=1;
  years = new int[y];
  years[(y-1)] = name.getYear(); //same error
}

它应该适用于你的所有功能