java - 我可以在 IntelliJ 中使用 Java 更新和设置多个变量吗？不，我不能

Question

宇宙!我为自己感到非常自豪，因为现在我可以在深入理解该主题的情况下分享我的第一个代码。问题是我不确定我是否能做我所理解的事情。也许我的错误比我想象的要愚蠢得多，但我想问你:我可以解决这个问题吗？

package com.company;

public class Main {

    public static void main(String[] args) {
    // write your code here
        System.out.println("Hello Java!");

    }int medicals;
    medicals = 0;
    medicals = medicals + 100;
    medicals = 20;
    medicals = medicals + 5;
    System.out.println("medicals");
    System.out.println(medicals);
    int medicals;
    int pharmacies;
    medicals = 200;
    pharmacies = 1;
    medicals = medicals - 5;
    medicals = medicals - 10;
    medicals = medicals - 15;
    medicals = medicals - 20;
    medicals = 5;
    System.out.println(medicals);
}

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Answer 1

不要将同一个变量声明两次(intmedics;已在代码中声明两次)。我已将其删除并在 main 方法中添加了您的代码，

package com.company;

public class Main {
    public static void main(String[] args) {
        // write your code here
        System.out.println("Hello Java!");

        int medicals;
        medicals = 0;
        medicals = medicals + 100;
        medicals = 20;
        medicals = medicals + 5;
        System.out.println("medicals");
        System.out.println(medicals);
        int pharmacies;
        medicals = 200;
        pharmacies = 1;
        medicals = medicals - 5;
        medicals = medicals - 10;
        medicals = medicals - 15;
        medicals = medicals - 20;
        medicals = 5;
        System.out.println(medicals);
    }
}