令牌上的语法错误＆＃34;;＆＃34;在Java中

Question

＆＃34;令牌上的语法错误＆＃34;;＆＃34;，此令牌后预期的原始类型＆＃34;是这句话"String data = input.next(); "上的半结肠后我得到的信息，我不知道为什么。

import java.util.*;
public class PorterHouse {
    public static void main(String[] args){
System.out.println("enter interest rate, loan mount, and number of years: ex. "+
    " 7.9-400000-5");
Scanner input = new Scanner(System.in);

String data = input.next(); 

[] b = data.split("[-]");
double interstRate = Double.parseDouble(b[0]);
double loanPrincipal = Double.parseDouble(b[1]);
double loanLength = Double.parseDouble(b[2]);
double monthlyPayment = (b[1]*b[2] / 1);
double totalPayment = ( monthlyPayment * loanLength * 12);
System.out.println("Monthly Pament: " + monthlyPayment);
System.out.println("totalPayment: " + totalPayment);


}
}

Answer 1

尝试改变这一点：

[] b = data.split("[-]");

用这个：

string[] b = data.split("[-]");

目前[] b没有数据类型。所以要为它提供数据类型。

Answer 2

我想而不是：

[] b = data.split("[-]");

你需要这样的东西：

String[] b = data.split("[-]");

也

您可能想要替换：

double monthlyPayment = (b[1]*b[2] / 1);

by：

double monthlyPayment = (loanPrincipal * loanLength  / 1); //idk why divide by 1??

cuz，b[1]和b[2]是两个字符串。