cannot create and run a JAR file

Question

package company;

public class Employee{
    private int num;

    public Employee(int newNum) {
       setNum(newNum);
    }

    public int getNum() {
        return num;
    }
    public void setNum(int newNum) {
        num = newNum;
    }
}

and there is my driver.

import company.*;

public class PrintEmployee {
   public static void main(String[] args) {
       Employee emp;
       emp = new Employee(10000);
       System.out.println(emp.getNum());
   }
}

First, I compile Employee.java with javac *.java.
Secondly, I am using jar -cf company.jar .\*.class this command to create a JAR file.
After that, I am using javac -cp company.jar PrintEmployee.java this command to compile it but it does not work.

PrintEmployee.java:1: error: package company does not exist
bad class file: C:\Users\user\Desktop\company\company.jar(/Employee.class)

How can I do it...

Why would you want to compile it a second time? You want to run it the second time using `java` no? — Yassin Hajaj, May 01 '18 at 06:32
try: `jar jar -cf company.jar .\*.class` then `java -jar company.jar PrintEmployee.java` to run the jar — Allan, May 01 '18 at 06:35
Don't execute `jar` in the same directory as the class files, do it in the parent directory of `company` — MadProgrammer, May 01 '18 at 06:37
Be advised. Your constructor calls an overridable method, which can cause open doors to many bugs. [See here](https://stackoverflow.com/a/3404369/507738). — MC Emperor, May 01 '18 at 06:38

score 2 · Accepted Answer · answered May 01 '18 at 06:50

2

you are missing package company in the jar file.

mkdir company
mv Employee.java company/
javac company/*.java
jar -cf company.jar company/*.class

then you can run

javac -cp company.jar PrintEmployee.java

without any problem

answered May 01 '18 at 06:50

guleryuz

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cannot create and run a JAR file

1 Answers1