Question

static_assert(sizeof(void*) <= sizeof(jlong), "Unsupported architecture");

错误：

import java.util.Scanner; public class OnlineShop { public static void main (String[]args) { final double subAmmount; subAmmount = subAmmount + Array[i]; }

Answer 1

“ subAmmount”尚未初始化/设置，因此您不能向其自身添加subAmmount，因为它不等于任何值。

Answer 2

由于subAmount未声明为static，因此必须在声明时进行初始化。所以你应该有这样的东西

import java.util.Scanner;

public class OnlineShop {

  public static void main (String[]args) {

    final double subAmmount = Array[i]; // Assuming Array[i] is defined somewhere
}

如果您想先声明然后初始化，则可以这样做：

import java.util.Scanner;

public class OnlineShop {

  static final double subAmmount;

  public static void main (String[]args) {

    subAmmount = Array[i]; // Assuming Array[i] is defined somewhere
}

在final关键字上仔细检查一下link

分配最终变量后，是否可以更改它们？

2 个答案: