Java 如何在obj上使用集合方法。更改值的引用_Java_Setter

Java 如何在obj上使用集合方法。更改值的引用

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Java 如何在obj上使用集合方法。更改值的引用,java,setter,Java,Setter,你好。一般来说，我对Java和OOP不太熟悉，但在Python和C中还可以。我需要了解如何在餐厅对象引用r2上使用适当的mutator（setter）方法，并将服务人数和人均价格的值更改为餐厅对象引用r1中的相同值。我不想更改餐厅名称。餐厅等级： package restaurantclient; public class RestaurantClient { public static void main(String[] args) { Restaurant r1 = n

你好。一般来说，我对Java和OOP不太熟悉，但在Python和C中还可以。我需要了解如何在餐厅对象引用r2上使用适当的mutator（setter）方法，并将服务人数和人均价格的值更改为餐厅对象引用r1中的相同值。我不想更改餐厅名称。

餐厅等级：

package restaurantclient;  

public class RestaurantClient { 
public static void main(String[] args) { 
    Restaurant r1 = new Restaurant("McDonalds", 1000000, 8.00);
    Restaurant r2 = new Restaurant("KFC", 500000, 6.00);

    System.out.println(r1.toString());
    System.out.println(r2.toString());

    //I would like the code to go here, in-between the toString and the equals comparison. 

    if (r1.equals(r2))  {
        System.out.println("The objects are equal.");
        }
    else {
        System.out.println("The objects are not equal.");
        System.out.println();
        }

    System.out.println();
    System.out.print("The avg. annual taxes paid by restaurant 1 is: $");
    System.out.println(r1.getAverageTaxes());
    System.out.print("The avg. annual taxes paid by restaurant 2 is: $");
    System.out.println(r2.getAverageTaxes());
    System.out.println();
    }
}

您已经在类上定义了setter方法-

r2.setAveragePrice(r1.getAveragePrice());
r2.setPeopleServed(r1.getPeopleServed());

至于你的问题——

在餐厅对象参考r2上使用适当的mutator（setter）方法，并将服务人数和人均平均价格的值更改为餐厅对象参考r1中的相同值

首先，使用getter方法检索

r1

对象的值，然后将这些值传递给

r2

对象上的setter方法。例如—

//Setters (Mutators)
public void setPeopleServed(int peopleServed) { 
this.peopleServed = peopleServed; 
}

public void setAveragePrice(double averagePrice) { 
this.averagePrice = averagePrice; 
}

或者，更简洁地说：

int peopleToSet = r1.getPeopleServed();
r2.setPeopleServed(peopleToSet);