sort object by comparator java

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List<Module> modules = parentModule.getSubModules();
Collections.sort(modules, new Comparator<Module>() {
    @Override
    public int compare(Module module1, Module module2) {
        //Integer compareTo
        return module1.getPosition().compareTo(module2.getPosition()); //ASCEDNING
        //return (-1) * module1.getPosition().compareTo(module2.getPosition()); //DESCEDNING
    }
});
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