用Java写个小程序：创建银行账号类SavingAccount,利用静态变量存储年利率,利用私有实例变量存储存款额,

import java.util.Scanner

public class SavingAccount {

public static double account = 3000

public static double rate = 0.03

public void update(double rate){

this.rate = rate

}

//flag 用来计算年利息和月利息,flag等true计算月利息

public double calc(double account , double rate , boolean flag){

if(flag)

return account * rate / 12

return account * rate

}

static class Test{

public static void main(String[] args) {

System.out.println("原始存款:"+SavingAccount.account + " \n原始利率:" +SavingAccount.rate )

SavingAccount sa = new SavingAccount()

System.out.println("原始年利息:"+sa.calc(SavingAccount.account,SavingAccount.rate,false))

System.out.println("原始月利息:"+sa.calc(SavingAccount.account,SavingAccount.rate,true))

System.out.println("######请输入新的利率######")

Scanner scanner = new Scanner(System.in)

sa.update(scanner.nextDouble())

System.out.println("更新后的利率:"+SavingAccount.rate)

System.out.println("更新后的年利息:"+sa.calc(SavingAccount.account,SavingAccount.rate,false))

System.out.println("更新后的月利息:"+sa.calc(SavingAccount.account,SavingAccount.rate,true))

//更新后的存款怎么算? 你念亏是多长时间更新一次厅卜?

System.out.println("更新后的存款:"+(SavingAccount.account+sa.calc(SavingAccount.account,SavingAccount.rate,false)))

}

}

}

不扮高穗知道对不对,我理解的是这样的了

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