Java 打印字符串中的整数时出错

我是Java新手，正在阅读一本包含以下代码的书

class Vehicle {
    int passengers;
    int fuelcap;
    int mpg;

    int range() {
        return mpg * fuelcap;
    }

    double fuelneeded(int miles) {
        return (double) miles / mpg;
    }
}

class TwoVehicles {
    public static void main(String args[]) {
        Vehicle minivan = new Vehicle();
        Vehicle sportscar = new Vehicle();
        double gallons;
        int dist = 252;

        minivan.passengers = 7;
        minivan.fuelcap = 16;
        minivan.mpg = 21;

        sportscar.passengers = 2;
        sportscar.fuelcap = 14;
        sportscar.mpg = 12;

        gallons = minivan.fuelneeded(dist);
        System.out.println("To go ", + dist + " miles minivan needs " + gallons + " gallons of fuel.");

        gallons = sportscar.fuelneeded(dist);
        System.out.println("To go ", + dist + " miles sportscar needs " + gallons + " gallons of fuel.");
    }
}

---

然而，在运行这段代码时，我得到一个错误，它是‘error:no-appeatedmethodforprintln（String，String）’。为什么会发生这种情况？

您不能使用带有2参数的

System.out.println

，只传递1字符串

不在字符串中的逗号（在字符串

“togo”之后，

）告诉编译器将字符串视为两个不同的参数

更改此行：

System.out.println("To go ", + dist + " miles minivan needs " + gallons + " gallons of fuel.");

为此：

System.out.println("To go " + dist + " miles minivan needs " + gallons + " gallons of fuel.");

---

不能将

System.out.println

与2参数一起使用，只传递1字符串

不在字符串中的逗号（在字符串

“togo”之后，

）告诉编译器将字符串视为两个不同的参数

更改此行：

System.out.println("To go ", + dist + " miles minivan needs " + gallons + " gallons of fuel.");

为此：

System.out.println("To go " + dist + " miles minivan needs " + gallons + " gallons of fuel.");

---

由于字符串外部存在逗号（，），因此代码显示错误

System.out.println("To go ", + dist + " miles minivan needs " + gallons + " gallons of fuel.");

你的代码应该是

System.out.println("To go ," + dist + " miles minivan needs " + gallons + " gallons of fuel.");

---

由于字符串外部存在逗号（，），因此代码显示错误

System.out.println("To go ", + dist + " miles minivan needs " + gallons + " gallons of fuel.");

你的代码应该是

System.out.println("To go ," + dist + " miles minivan needs " + gallons + " gallons of fuel.");

删除

“待办事项”之后的逗号，

。删除

“待办事项”之后的逗号，

。