从Java中的ArrayList打印元素

我有一个保存ArrayList的类。我想通过调用testClass中的getOrderItems方法来打印该数组中的所有项目。我遇到了麻烦，数组元素返回的方式。从Java中的ArrayList打印元素

这里是类：

package shopping; 

import java.util.ArrayList; 

public class ShoppingCart { 
    private ArrayList<Item> list; 


    public ShoppingCart() { 
     this.list = new ArrayList<Item>(5); 
    } 

    public void addItem(Item item1) { 
     this.list.add(item1); 
    } 

    public int getTotal() { 
     int total = 0; 

     for(Item it : list) { 
      total = total + it.getCost(); 
     } 
     return total; 
    } 

    public void removeItem(Item item1) { 
     this.list.remove(item1); 
    } 

    public int finalizeOrder() { 
     int cartSize = this.list.size(); 
     return cartSize; 
    } 

    //print elements from ArrayList<Item> 
    public String getOrderItems() { 
     System.out.println(this.list); 
    return null; 
    } 

}

下面是从TestClass中块：

//email possible & create 
     int emailPossible = card.verifyCard(); 
     if (emailPossible > 0) { 
      System.out.println("Email object has been added"); 
      System.out.println("Your orders was successful and has been placed.\nHere are the details of your order: \n"); 
      System.out.println("Items:\n------"); 
      System.out.println(cart.getOrderItems()); 
     }else{ 
      System.out.println("Email object has not been added"); 
     } 
     //end email possible & create

然而，我的输出似乎是打印每个项目的地址，而不是项目本身：

Email object has been added 
Your orders was successful and has been placed. 
Here are the details of your order: 

Items: 
------ 
[[email protected], [email protected], [email protected]] 
null

来源

2016-09-28 Kuyashi

或者覆盖[Object＃toString]（https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html#toString（））或访问您想要打印的字段一个方法。 – SomeJavaGuy

您应该覆盖的toString()方法10班。它将允许您以自定义的方式打印其对象。

来源

2016-09-28 10:48:59

通过在类中重写对象的超类方法来实现toString，您将能够将列表打印为字符串而不是引用。

来源

2016-09-28 10:49:18

从Java中的ArrayList打印元素

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