帮助解决 Java 错误，

Question

所有这些都是在 bluej 中编译和运行的，所以不需要 main 方法，我收到很多错误，而且我是 java 新手，所以我不知道如何修复它们。任何帮助将不胜感激。

这个有错误`import java.util.*;

公共类 LettingAgent{

private ArrayList<Property>myProperty;
private int propertyNo;


public LettingAgent(){
    myProperty = new ArrayList<Property>();
    propertyNo = 0;
}

public void addProperty(String newAddress, char newLocation, int newMonthlyRent, int newNoOfBedrooms){
    Property newProperty = new Property(newAddress, newLocation, newMonthlyRent, newNoOfBedrooms);
    myProperty.add(newProperty);
}


public void removeProperty(int propertyNo){
    if(propertyNo>myProperty.size() || propertyNo<0){
        System.out.println("Invalid Property Number!");

    }else{
        myProperty.remove(propertyNo);
        System.out.println("Property Successfully removed.");            
    }
}


public void addTenant(int propertyNo, String tenantName){ 
    if(propertyNo>myProperty.size() || propertyNo<0){
        System.out.println("Invalid Property Number!");          
    }else{
        myProperty.get(propertyNo);
        //Property.newTenant(tenantName);            
    }
}


public void removeTenant(int propertyNo){
    if( propertyNo<myProperty.size()){
        myProperty.get(propertyNo);
        //Property.removeTenant();
    }else{
        System.out.println("Invalid Property Number!");
    }
}
public void searchProperty(String searchAddress){
    int propertyNumber = 0;     
    for(Property Property : myProperty){
        myProperty.get(propertyNumber);            
        if (myProperty.get(propertyNo).equals(searchAddress)){
            System.out.println("Property Details: "+ Property);
        }
        else{
            System.out.println("No Such Property.");
        }

        if(propertyNumber>myProperty.size()){
            System.out.println("No Such Property.");           
        }else{
            break;
        }           

    }

}
public void propertyList(Char location, int maxRent, int minBedrooms){

    for(Property Property : myProperty){
        if((Property.getLocation().equals(location))&& (Property.get(newMonthlyRent).equals(maxRent))&& (myProperty.get(newNoOfBedrooms).equals(minBedrooms))){
            System.out.println(propertyNo);
            Property.displayDetails();                            
        }else{
            System.out.println("Property Does Not Fit Search Criteria!");
        }        
    }                    
}

}

`

这是关联类`//属性类 公共类属性{ //初始化变量 私有字符串地址； 私人字符位置； 私人 int 月租； 私人 int noOfBedrooms; 私有布尔占用； 私有字符串租户名；

//constructor, to create a new property
public Property( String newAddress, char newLocation,int newMonthlyRent, int newNoOfBedrooms){ 
    address = newAddress;
    location = newLocation;
    monthlyRent = newMonthlyRent;
    noOfBedrooms = newNoOfBedrooms;
    occupied = false;
    tenantName = "";
}

//method to return the address of created property
public String getAddress(){
    return address;
}
//method to return the location of created property    
public char getLocation(){
    return location;
}
//method to return the rent of created property    
public int getMonthlyRent(){
    return monthlyRent;
}
//method to return the number of bedrooms of created property   
public int getNoOfBedrooms(){
    return noOfBedrooms;
}
//method to return the occupied status of created property    
public boolean getOccupied(){
    return occupied;
}
//method to return the name of the tenant of created property    
public String getTenantName(){
    return tenantName;
}
//method to set a new monthly rent
public void newRentRate(int newMonthlyRent){
    monthlyRent = newMonthlyRent;
}
//method to set a new tenant, but only works if current property is empty
public void newTenant(String newTenant){
    if(occupied){
        System.out.println(" ERROR! Property is already occupied. ");
    }else{
        tenantName = newTenant;
        occupied = true;       
    }

}
//method used to remove tenant and reset the occupied status to false
public void removeTenant(){
    if(occupied){
        tenantName = " ";
        occupied = false;
    }else{
        System.out.println("ERROR! Property is already empty.  ");
    }
}
//method implements a switch statement to switch the char type in to a more understandable string type
// and also then displays the full property details.
public void displayDetails(){
    String fullLocation;
    switch(location){
        case 'n': case 'N': fullLocation = " North London"; break;
        case 's': case 'S': fullLocation = " South London"; break;
        case 'e': case 'E': fullLocation = " East London"; break;
        case 'w': case 'W': fullLocation = " West London"; break;
            default: fullLocation = " unknown";
    }

    System.out.println("Address :" + address);
    System.out.println("Location :" + fullLocation);
    System.out.println("Monthly Rent : " + monthlyRent);
    System.out.println("Number of bedrooms : " + noOfBedrooms);
    System.out.println("Occupied Status : " + occupied);

    if(occupied){
        System.out.println("Tenants Name : " + tenantName);
    }else{
        System.out.println(" ");
    }

}

} `

Answer 1

Property 类没有定义方法 get()。

将Property.get(newMonthlyRent).equals( 更改为Property.getMonthlyRent().equals(

此外，您似乎将Property 单个属性 与包含所有属性列表

的 ArrayList myProperty 混合在一起

ArrayList 上的 get() 方法将返回单个 Property 实例，因此在您的 addTenant() 方法中，使用 myProperty.get(propertyNo).newTenant(tenantName);

---

更新

Property.getLocation() 返回 char 而不是 String。 char 没有 equals() 方法。

将Property.getLocation().equals(location) 更改为Property.getLocation() == location