算投资

import javax.swing.JOptionPane;


public class Investment {
    public static void main(String[] args){
        double value;
        String input = JOptionPane.showInputDialog(null,"请输入投资金额：","对话框",JOptionPane.QUESTION_MESSAGE);
        String input1 = JOptionPane.showInputDialog(null,"请输入年利率：","对话框",JOptionPane.QUESTION_MESSAGE);
        String input2 = JOptionPane.showInputDialog(null,"请输入投资年数：","对话框",JOptionPane.QUESTION_MESSAGE);
        double investmen = Double.parseDouble(input);
        double rate = Double.parseDouble(input1);
        double year = Double.parseDouble(input2);
        value = investmen * (Math.pow((1 + rate / 100),(year)));
        JOptionPane.showMessageDialog(null, value);
    }
}

读取投资金额，年利率和年数，输出未来投资金额

未来投资金额=投资金额*（1+年利率）^年数*12

使用方法Math.pow（a,b）来计算a的b次幂