Question

schema.pre('validate', function preValidate(next) {
    if (this.status == 'draft') {
        // Make all fields optional
        _.each(_.keys(schema.paths), function (attr) {
            schema.path(attr).required(false);
        });

        var draftRequiredMap = ['title']; // Based on condition, our required fields are here.
        _.each(draftRequiredMap, function (attr) {
            schema.path(attr).required(true);
        });
    }
}

package accounttest;

/**
 * Customer --- A class that stores the customer name and customer usage and provides a method, calcUsage,
 *              to calculate the price to the customer based on the customer usage
 * 
 * @author s0267955, William Rogers
 */
public class Account {
    public static String custName; //Stores the customer name
    public static int custUsage;  //Stores the customers usage
    public static int custAccountNumber;  //Stores the customers account number

    public Account(){  //No use of a constructor
    }

    public void setName(String name){  //Sets the name of the customer
        custName = name;
    }
    public String getName(){  //Gets the name of the customer
        return custName;
    }
    public void setUsage(int usage){  //Sets the usage for the customer
        custUsage = usage;
    }
    public int getUsage(){  //Gets the usage of the customer
        return custUsage;
    }
    public void setAccountNumber(int accountNumber){//Sets the account number
        custAccountNumber = accountNumber;
    }
    public int getAccountNumber(){  //Gets the account number of the customer
        return custAccountNumber;
    }
}

结果：

public class AccountTest {


/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    final int TOTAL_ACCOUNTS = 2;  // The total number of accounts
    ArrayList<Account> account= new ArrayList<Account>(); 

    for(int x = 0;x<TOTAL_ACCOUNTS;x++){  
        Account tempAccount = new Account(); 
        Scanner input = new Scanner( System.in );
        System.out.print( "Enter the name for Customer #"+(x+1)+": ");
        tempAccount.setName(input.nextLine()); 
        System.out.print( "Enter the account number for "+tempAccount.getName()+":");
        tempAccount.setAccountNumber(input.nextInt());  //gets the account number for the temp account
        System.out.print( "Enter the internet usage for Customer #"+(x+1)+": ");
        tempAccount.setUsage(input.nextInt()); //retrieves customer usage for the temp account object

        account.add(tempAccount); //Adds the account object to the array

    }

    for(Account x:account){ 
        System.out.print(x + " ");
        System.out.print(x.getName()+", ");
        System.out.print(x.getAccountNumber()+", ");
        System.out.print(x.getUsage());
        System.out.println();
    }
   }
}

问题：为什么对象会被覆盖？我需要程序能够添加新对象，但所有地址都被最后添加的对象覆盖

Answer 1

正如 @BoristheSpider 指出的那样，从变量中删除 static 。

public class Account {
    public String custName; //Stores the customer name
    public int custUsage;  //Stores the customers usage
    public int custAccountNumber;  //Stores the customers account number
    ...

注意：将您的扫描仪声明为外循环。

添加临时对象时覆盖arraylist中的对象

1 个答案: