继承是一个概念，它允许我们从一个类访问另一个类的属性和行为。被继承方法和成员变量的类被称为超类或父类，而继承这些方法和成员变量的类被称为子类或子类。在Java中，我们使用“extends”关键字来继承一个类。
在本文中，我们将讨论使用继承来计算定期存款和定期存款的利息的Java程序。首先，在您的本地机器IDE中创建这四个Java文件 -
Acnt.java − 这个文件将包含一个抽象类‘Acnt’，用于存储账户详情，如利率和金额。它还将具有一个带有参数‘amnt’的抽象方法‘calcIntrst’，用于计算利率。
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FDacnt.java − 它将计算定期存款（FDs）的利率。在其中，'FDacnt'类将继承'Acnt'类并重写'calcIntrst'方法。
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RDacnt.java − 它将计算定期存款（FDs）的利率。在其中，'RDacnt'类将继承'Acnt'类并覆盖'calcIntrst'方法。
Intrst.java − 这个文件将包含主方法。
Example
Acnt.java
public abstract class Acnt{
double intrstRate;
double amnt;
abstract double calcIntrst(double amnt);
}
FDacnt.java
import java.util.*;
public class FDacnt extends Acnt {
double FDintrstRate;
double FDAmnt;
int period;
int age;
double Gen, SenCitizen;
Scanner input = new Scanner(System.in);
@Override
double calcIntrst(double amnt){
this.FDAmnt = amnt;
System.out.println("Enter your FD days");
period = input.nextInt();
System.out.println("Enter the age of account holder ");
age = input.nextInt();
if (amnt < 10000000) {
if (period >= 7 && period <= 14) {
Gen = 0.0450;
SenCitizen = 0.0500;
} else if (period >= 15 && period <= 29) {
Gen = 0.0470;
SenCitizen = 0.0525;
} else if (period >= 30 && period <= 45) {
Gen = 0.0550;
SenCitizen = 0.0600;
} else if (period >= 45 && period <= 60) {
Gen = 0.0700;
SenCitizen = 0.0750;
} else if (period >= 61 && period <= 184) {
Gen = 0.0750;
SenCitizen = 0.0800;
} else if (period >= 185 && period <= 365) {
Gen = 0.0800;
SenCitizen = 0.0850;
}
FDintrstRate = (age < 50) ? Gen : SenCitizen;
} else {
if (period >= 7 && period <= 14) {
intrstRate = 0.065;
} else if (period >= 15 && period <= 29) {
intrstRate = 0.0675;
} else if (period >= 30 && period <= 45) {
intrstRate = 0.00675;
} else if (period >= 45 && period <= 60) {
intrstRate = 0.080;
} else if (period >= 61 && period <= 184) {
intrstRate = 0.0850;
} else if (period >= 185 && period <= 365) {
intrstRate = 0.10;
}
}
return FDAmnt * FDintrstRate;
}
}
RDacnt.java
的翻译为：RDacnt.java
import java.util.*;
public class RDacnt extends Acnt{
double RDIntrstRate;
double RDamnt;
int periods;
double monthlyAmnt;
double Gen, SenCitizen;
Scanner input = new Scanner(System.in);
@Override
double calcIntrst(double amnt){
this.RDamnt = amnt;
System.out.println("Enter your RD months");
periods =input.nextInt();
System.out.println("Enter the age of account holder");
int age =input.nextInt();
if (periods >= 0 && periods <= 6) {
Gen = .0750;
SenCitizen = 0.080;
} else if (periods >= 7 && periods <= 9) {
Gen = .0775;
SenCitizen = 0.0825;
} else if (periods >= 10 && periods <= 12) {
Gen = .0800;
SenCitizen = 0.0850;
} else if (periods >= 13 && periods <= 15) {
Gen = .0825;
SenCitizen = 0.0875;
} else if (periods >= 16 && periods <= 18) {
Gen = .0850;
SenCitizen = 0.0900;
} else if (periods >= 22) {
Gen = .0875;
SenCitizen = 0.0925;
}
RDIntrstRate = (age < 50) ? Gen : SenCitizen;
return RDamnt * RDIntrstRate;
}
}
Intrst.java
的翻译为：Intrst.java
import java.util.*;
public class Intrst{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
System.out.println("Choose from the Options: " + "\n1." + " FD Interest" + " \n2." + " RD Interest"
+ "\n3." + " Exit");
int choice = sc.nextInt();
switch (choice){
case 1:
FDacnt fds = new FDacnt();
System.out.println("Enter your FD Amount");
double fAmnt = sc.nextDouble();
System.out.println("Interest gained on your FD Amount is: $ " + fds.calcIntrst(fAmnt));
break;
case 2:
RDacnt rds = new RDacnt();
System.out.println("Enter your RD amount");
double RAmnt = sc.nextDouble();
System.out.println("Interest gained on your RD Amount is: $ " + rds.calcIntrst(RAmnt));
break;
default:
System.out.println("Choose correct choice");
}
}
}
要编译此代码，请键入以下命令：javac Intrst.java
Now to run: java Intrst输出
Choose from the Options: 1. FD Interest 2. RD Interest 3. Exit 1 Enter your FD Amount 56000 Enter your FD days 325 Enter the age of account holder 32 Interest gained on your FD Amount is: $ 4480.0
上述程序是一个菜单驱动程序。当我们执行该程序时，屏幕上将显示三个选项。选择1来计算定期存款的利率，选择2来计算定期存款的利率。
结论
我们使用了层次继承的概念来计算定期存款和定期存款的利息。类“Acnt”被其两个子类“FDacnt”和“RDacnt”继承。
