如何根據我使用的自定義類將物件類名稱 哈希碼的輸出更改為字串輸出

我是 Java 新手，我正在練習創建類、物件和從類中獲取變數。我創建了一個類 Factory，其中包含 2 個字串變數和一個來自不同類的物件陣列，稱為 Item，其中包含 2 個字串變數。在我的主程式中，我想從 Factory 類中洗掉變數。我設法列印了名稱和地址，但 getItem() 顯然不會從 Item 類列印 getName() 字串。我嘗試在 Factory 類中使??用 toString 覆寫，但我猜它不適用于這種型別的自定義類。在這種情況下我能做什么？

類工廠：

public class Factory {

     public static final int MAX_ODABRANIARTIKLI = 3;

     String name;
     String address;
     Item[] items = new Item[MAX_ODABRANIARTIKLI];


public Factory(String name, String address, Item[] items) {
    this.name = name;
    this.address = address;
    this.items = items;
}

public String getName() {
    return name;
}

public String getAddress() {
    return address;
}

public Item[] getItems() {
    return items;
}

public void setName(String name) {
    this.name = name;
}

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

public void setItems(Item[] items) {
    this.items = items;
}
}

類專案：

public class Item {

    String name;
    String category;
}
public Item(String name, String category) {
    this.name = name;
    this.category = category;
}

public String getName() {
    return name;
}

public String getCategory() {
    return category;
}

public void setName(String name) {
    this.name = name;
}

public void setCategory(String category) {
    this.category = category;
}
}

主要代碼：

import hr.java.production.model.Factory;

public class Main {

public static final int MAX_TVORNICA = 2;

public static void main(String[] args) {

Factory[] tvornice = new Factory[MAX_TVORNICA];

System.out.println("Unijeli ste sljede?e tvornice:");
    for(Factory factory : tvornice){
       ispisTvornica(factory);
    }
}

public static void ispisTvornica(Factory factory){

    System.out.println("Naziv: "   factory.getName());
    System.out.println("Web adresa: "   factory.getAddress());
    System.out.println("Odabrani artikli: "   factory.getItems());
}

uj5u.com熱心網友回復：

覆寫回傳名稱的 Item 類中的 toString() 方法，然后您可以使用 Arrays.toString(factory.getItems())

uj5u.com熱心網友回復：

嘗試這個

工廠.Java

public class Factory {
    public static final int MAX_ODABRANIARTIKLI = 3;

    String name;
    String address;
    Item[] items = new Item[MAX_ODABRANIARTIKLI];

    public Factory(String name, String address, Item[] items) {
        this.name = name;
        this.address = address;
        this.items = items;
    }

    public String getName() {
        return name;
    }

    public String getAddress() {
        return address;
    }

    public Item[] getItems() {
        return items;
    }

    public void setName(String name) {
        this.name = name;
    }

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

    public void setItems(Item[] items) {
        this.items = items;
    }
}

專案.java

public class Item {
    String name;
    String category;

    public Item(String name, String category) {
        this.name = name;
        this.category = category;
    }

    public String getName() {
        return name;
    }

    public String getCategory() {
        return category;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    @Override
    public String toString() {
        return "Item [name="   name   "]";
    }
    
    
}

主程式

public class Main {
    public static final int MAX_TVORNICA = 2;

    public static void main(String[] args) {
        int i = 0;
        
        Factory[] tvornice = new Factory[MAX_TVORNICA];

        System.out.println("Unijeli ste sljede?e tvornice:");

        Item[] items = { new Item("Joy", "category_Joy"), new Item("Roy", "category_Roy") };

        tvornice[0] = new Factory("Jems", "ABC", items);
        tvornice[1] = new Factory("ivuksan", "XYZ", items);

        for (Factory factory : tvornice) {
            ispisTvornica(factory, i  );
        }
        
        System.out.println("------------------------------------------------------------------------");
        
        for (Factory factory : tvornice) {
            ispisTvornicaAnother(factory);
        }
    }

    public static void ispisTvornica(Factory factory, int i) {

        System.out.println("Naziv: "   factory.getName());
        System.out.println("Web adresa: "   factory.getAddress());
        System.out.println("Odabrani artikli: "  factory.getItems()[i]);
    }
    
    public static void ispisTvornicaAnother(Factory factory) {

        System.out.println("Naziv: "   factory.getName());
        System.out.println("Web adresa: "   factory.getAddress());
        for(Item item : factory.getItems())
            System.out.println("Odabrani artikli: "   item);
    }
}

我定義了兩個函式：

1. ispisTvornica() 函式為每次迭代列印 Item 類中存在的 1 x 1 項名稱
2. ispisTvornicaAnother() 函式為每次迭代列印它列印所有專案名稱。

輸出：-

Unijeli ste sljede?e tvornice:
Naziv: Jems
Web adresa: ABC
Odabrani artikli: Item [name=Joy]
Naziv: ivuksan
Web adresa: XYZ
Odabrani artikli: Item [name=Roy]
------------------------------------------------------------------------
Naziv: Jems
Web adresa: ABC
Odabrani artikli: Item [name=Joy]
Odabrani artikli: Item [name=Roy]
Naziv: ivuksan
Web adresa: XYZ
Odabrani artikli: Item [name=Joy]
Odabrani artikli: Item [name=Roy]

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