Java: Expose public class method to all packages of same project but make private for other projects

Question

I have a library project with two packages say package1 and package2 with class1 and class2 respectively. class1 has some public methods exposed to end user. I want to add few utility methods in class1 that only class2 can access. I searched a lot but I couldn't find any access modifier for method to grant access across different packages of same project only.

It there any chance to achieve it by any means?

UPDATE (Code example):

Class1 in package1:

package com.example.package1;

public class Class1 {

    // This method should only be accessed by Class2, cannot made it public for
    // every class
    void performUtilityOperation() {
        // internal utility
    }

    // other public methods...
}

Class2 in package2:

package com.example.package2;

import com.example.package1.*;

public class Class2 {

    Class1 class1;

    public void setClass1(Class1 class1) {
        this.class1 = class1;
    }

    public void doSomeOperation() {
        this.class1.performUtilityOperation(); // here this method is not
                                                // accessible if not public
        // do some other operations
    }

    // other public methods
}

Answer 1

There is no way to achieve this(nothing like friend in C++ if that's where u r coming from). Although protected members are accessible from a different package by an extending class as shown below:

package1
public Class1{
    protected method();
}

Class2 extends Class1 and hence the method() is visible in Class1 even if Class2 is in a different package.

package2
public Class2 extends Class1{
    public otherMethod(){
        method(); // is visible here
    }
}

Class3 does not extend Class1 hence method() will not be visible

 package2
 public Class3{
      public otherMethod(){
          method(); // not visible here
      }
 }

IMO this is the furthest you can go for hiding methods in Class1