Updating a jar file with a new .class files

Question

I have a Jar file which contains multiples .class files. I want to update one of the .class file with a new one, I used the command:

jar uf jar-file input-file(s)

My problem is that others classes use some functions defined in the updated class file and after updating it seems that I can't call any method of the updated class. Please have a look on my example below:

class1.java:

package com.package1;

class1 
{ 
   void method1()
   {
      System.out.println("In method1");  
   }
}

class2.java:

package com.package2; 
import com.package1.class1; 

class2 
{ 
   void method2()
   {
      class1 cl1 = new class1();

      cl1.method1(); //<<<<<< This line doesn't work after updating class1, program exits.
   }
}

- MyJar.jar:

      class1.class  
      class2.class

Do I need to recompile all classes of the jar?

Answer 1

Will work on OS having drag-n-drop feature.

If you have 7-zip software installed (or maybe any archive viewer), then

open the jar file with 7-zip -> navigate to the package -> drag and drop the .class file