[英]Trouble passing an object to method in a separate class
因此,我是第一次编写自己的类,而我一直无法弄清的唯一方法是compareTo方法,该方法应该具有“一个参数:SavingsAccount对象。将其命名为所需的名称”。
public int compareTo(SavingsAccount secAccount)
{
int result;
if ( balance > secAccount.getBalance() )
result = 1;
else if ( balance == secAccount.getBalance() )
result = 0;
else
result = -1;
return result;
}
当我尝试编译时,出现此错误:
错误:缺少return语句}
在客户端(由我的教授写的,我不应该编辑)中,这是调用compareTo方法的行:
if ( savings1.compareTo(savings2) > 0 )
System.out.println("[client] Savings1 has the larger balance");
else if (savings1.compareTo(savings2) == 0 )
System.out.println("[client] Savings1 and Savings2 "
+ "have the same balance");
else
System.out.println("[client] Savings2 has the larger balance");
据我了解,将参数Savings2传递给compareTo,然后在我的SavingsAccount类中,该参数是secAccount作为对象SavingsAccount。
无需声明int结果,您可以执行以下操作。
public int compareTo(SavingsAccount secAccount)
{
if ( balance > secAccount.getBalance() )
return 1;
else if ( balance == secAccount.getBalance() )
return 0;
else
return -1;
}
除非您需要该结果变量,否则它将起作用。 只要您可以这样做,就无需编写额外的变量代码设置值。
您可能只是流浪的花括号。 这是一个完整的工作示例:
文件Test.java的内容:
package com.jlb;
public class Test{
public static void main(String[] args)
{
SavingsAccount savings1 = new SavingsAccount(200);
SavingsAccount savings2 = new SavingsAccount(100);
if ( savings1.compareTo(savings2) > 0 )
System.out.println("[client] Savings1 has the larger balance");
else if (savings1.compareTo(savings2) == 0 )
System.out.println("[client] Savings1 and Savings2 "
+ "have the same balance");
else
System.out.println("[client] Savings2 has the larger balance");
}
}
文件SavingsAccount.java的内容:
package com.jlb;
public class SavingsAccount {
private int balance = 0;
public SavingsAccount(int amount){
this.balance = amount;
}
public int getBalance(){
return this.balance;
}
public int compareTo(SavingsAccount secAccount)
{
int result;
if ( balance > secAccount.getBalance() )
result = 1;
else if ( balance == secAccount.getBalance() )
result = 0;
else
result = -1;
return result;
}
}
您可以通过在创建Savings1和Savings2时更改值来进行测试,然后在Eclipse或您喜欢的任何IDE中将其作为Java程序运行。
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