从 java Main 调用另一个 java 文件中的方法 [英] call from java Main to methods in another java file

问题描述

执行时出现错误:在 MyCalcs.MtgeCalc() 行中找不到符号；在文件 Main.java 中为什么会这样???在文件 Main.java 我有:-

When executing I have error: cannot find symbol in the line MyCalcs.MtgeCalc(); in file Main.java Why is it so??? in file Main.java I have:-

 e/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.MyJava.002mavern;
public class Main {
    public static void main(String[] args) {
       MyCalcs.MtgeCalc();
   }
}

在文件 MyCalcs.java 中我有:-

and in file MyCalcs.java I have:-

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.MyJava.002mavern;
public class MyCalcs {
    public MyCalcs() {
    }
        public static double MtgeCalc(){
            System.out.println("mtgecalc");
            return 10;
        }
}

...只是在此处添加更多文本以满足发布问题数据完整性检查，但似乎此处需要大量文本，因此我将继续输入直到我能够发布我的问题...

...just adding more text here to satisfy the post question data integrity checks but it seems a lot of text is needed here so i'll keep typing until I am able to post my question...

推荐答案

您是否尝试过更改包装名称?正如 user 所提到的，包名不能以数字开头.尝试 com.MyJava，而不是 com.MyJava.002mavern，代码将编译并运行.

Have you tried changing the packing name? As user mentioned, package name cannot start with a number. Try com.MyJava, instead of com.MyJava.002mavern, and the code will compile and run.

更新 #2:除了错误的包，似乎并不是所有的 Java 文件都被编译.尝试 javac *.java 来编译两个 Java 文件.此外，有关 javac 和 java 命令的更多信息，请参阅以下 2 个 Java 8 参考:

UPDATE #2: Besides the incorrect package, it seems not all the Java files are compiled. Try javac *.java to compile both Java files. Also, see these 2 Java 8 references for more information on the javac and java commands:

• javac:https://docs.oracle.com/javase/8/docs/technotes/tools/windows/javac.html
• java:https://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html

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