字符串作为参数
问题描述:
//*******************************************************
// Account.java
//
// A bank account class with methods to deposit to, withdraw from,
// change the name on, charge a fee to, and print a summary of the account.
//*******************************************************
import java.text.NumberFormat;
public class Account
{
private double balance;
private String name;
private long acctNum;
//----------------------------------------------
//Constructor -- initializes balance, owner, and account number
//----------------------------------------------
public Account(double initBal, String owner, long number)
{
balance = initBal;
name = owner;
acctNum = number;
}
//----------------------------------------------
// Checks to see if balance is sufficient for withdrawal.
// If so, decrements balance by amount; if not, prints message.
//----------------------------------------------
public void withdraw(double amount)
{
if (balance >= amount)
balance -= amount;
else
System.out.println("Insufficient funds");
}
//----------------------------------------------
// Adds deposit amount to balance.
//----------------------------------------------
public void deposit(double amount)
{
balance += amount;
}
//----------------------------------------------
// Returns balance.
//----------------------------------------------
public double getBalance()
{
return balance;
}
//----------------------------------------------
// Returns a string containing the name, account number, and balance.
//----------------------------------------------
public String toString()
{
NumberFormat fmt = NumberFormat.getCurrencyInstance();
return (acctNum + "\t" + name + "\t" + fmt.format(balance));
}
//----------------------------------------------
// Deducts $10 service fee
//----------------------------------------------
public double chargeFee()
{
balance=balance-10;
return balance;
}
//----------------------------------------------
// Changes the name on the account
//----------------------------------------------
public void changeName(String newName)
{
name=String.toString(newName);
}
}
我需要该程序的最后部分的帮助//更改帐户上的名称。我需要将它作为一个字符串(名称)作为参数,并将其更改为新字符串(newName),那么正确的语法是什么?我无法在我的书中找到它。字符串作为参数
答
这将会是:
public void changeName(String newName)
{
name=newName;
}
答
name = newName;
会工作得很好。字符串是不可变的,所以不能在之后改变。
为什么要调用String.toString(newName),如果newName已经是一个字符串?它应该是name = newName; – Andre 2011-04-04 19:22:37