示例1：计算Java的简单兴趣
import java.util.Scanner;
class Main {
public static void main(String[] args) {
// create an object of Scanner class
Scanner input = new Scanner(System.in);
// take input from users
System.out.print("Enter the principal: ");
double principal = input.nextDouble();
System.out.print("Enter the rate: ");
double rate = input.nextDouble();
rate = rate/100;
System.out.print("Enter the time: ");
double time = input.nextDouble();
double interest = (principal * time * rate) / 100;
System.out.println("Principal: " + principal);
System.out.println("Interest Rate: " + rate);
System.out.println("Time Duration: " + time);
System.out.println("Simple Interest: " + interest);
input.close();
}
}输出
Enter the principal: 1000
Enter the rate: 8
Enter the time: 2
Principal: 1000.0
Interest Rate: 8.0
Time Duration: 2.0
Simple Interest: 160.0在上面的示例中，我们使用Scanner类从用户输入principal ， rate和time作为输入。然后，我们使用简单兴趣公式来计算简单兴趣。
Simple Interest = (Principal * Rate * Time) / 100示例2：计算复利
import java.util.Scanner;
class Main {
public static void main(String[] args) {
// create an object of Scanner class
Scanner input = new Scanner(System.in);
// take input from users
System.out.print("Enter the principal: ");
double principal = input.nextDouble();
System.out.print("Enter the rate: ");
double rate = input.nextDouble();
System.out.print("Enter the time: ");
double time = input.nextDouble();
System.out.print("Enter number of times interest is compounded: ");
int number = input.nextInt();
double interest = principal * (Math.pow((1 + rate/100), (time * number))) - principal;
System.out.println("Principal: " + principal);
System.out.println("Interest Rate: " + rate);
System.out.println("Time Duration: " + time);
System.out.println("Number of Time interest Compounded: " + number);
System.out.println("Compound Interest: " + interest);
input.close();
}
}输出
Enter the principal: 1000
Enter the rate: 10
Enter the time: 3
Enter number of times interest is compounded: 1
Principal: 1000.0
Interest Rate: 10.0
Time Duration: 3.0
Number of Time interest Compounded: 1
Compound Interest: 331.00000000000045在上面的示例中，我们使用了复利的公式来计算复利。
在这里，我们使用了Math.pow()方法来计算数字的幂。