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[英]How to return an array from a method and use it in another method in Java
[英]How to use method return from another Java class
我在'BankAccount.java'类中有此方法
public double calculateInterest()
{
double myInterest = 0.0;
if(myBalance > 0.0){
myInterest = this.myBalance * (myInterestRate/12.0);
}
return myInterest;
}
我需要在其他类中使用此方法,例如:
SavingsAccount extends BankAccount
if(this.myBalance > 0)
{
System.out.println(calculateInterest());
this.myBalance += super.calculateInterest();
this.myBalance -= this.myMonthlyServiceCharges;
}
我为什么不能做
this.myBalance += super.calculateInterest();
它返回为0.0
当它应该返回约0.4时
任何帮助都会很棒,谢谢
如果将这段代码放在SavingsAccount类中,它将起作用
public double calculateInterest()
{
double myInterest = 0.0;
if(myBalance > 0.0){
myInterest = this.myBalance * (myInterestRate/12.0);
}
return myInterest;
}
但这并没有真正教会我如何正确使用抽象类
为我工作。 在此我复制以下内容
public class BankAccount {
protected double myBalance = 0;
protected double myInterestRate = .6;
public double calculateInterest() {
double myInterest = 0.0;
if (myBalance > 0.0) {
double myInterestRate;
myInterest = this.myBalance * (this.myInterestRate / 12.0);
}
return myInterest;
}
}
接着....
public class SavingsAccount extends BankAccount {
double myMonthlyServiceCharges = 1;
public static void main(String[] args) {
SavingsAccount sa = new SavingsAccount();
sa.myBalance = 14;
sa.doIt();
}
void doIt() {
if (this.myBalance > 0) {
System.out.println(super.calculateInterest());
this.myBalance += super.calculateInterest();
this.myBalance -= this.myMonthlyServiceCharges;
}
}
}
您可以尝试一下,看看是否适合您吗?
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