Can't use methods of other class even after creating an object

 If you can't use methods of another class even after creating an object in Java, it might be due to a few common reasons:


1. **Access Modifiers**:

   - Check the access modifiers of the class and its methods. If the class or methods are declared as `private`, they are not accessible from outside the class. Ensure that the access modifiers are set to at least `public` or a more permissive modifier.


2. **Package/Private Access**:

   - If the class you are trying to access is in a different package and not declared as `public`, it may not be accessible unless you import the package or use package-private access. You might need to use the `import` statement or make the class or methods package-private (no access modifier) to access them from another package.


3. **Static Methods**:

   - If the methods you are trying to access are static, you should call them using the class name, not an instance. For example: `ClassName.methodName()`.


4. **Correct Object Creation**:

   - Make sure you are creating the object of the correct class and not making a typo in the class name.


5. **Inheritance and Interface Implementation**:

   - If the class with the methods you want to use is part of an inheritance hierarchy or implements an interface, ensure that you are working with the correct subclass or implementing class.


6. **Errors in the Code**:

   - Review your code to check for syntax errors, missing imports, or incorrect method signatures. Compile your code to ensure there are no compilation errors.


7. **Correct Method Name**:

   - Double-check that you are using the correct method name when calling it on the object.


8. **Exception Handling**:

   - If the method you are trying to call can throw checked exceptions, make sure to handle them using `try-catch` or declare that your method throws those exceptions.


9. **Classpath and Project Configuration**:

   - Ensure that the class you are trying to access is in the classpath and properly configured in your project. Sometimes, build or project configuration issues can prevent access to classes.


10. **Static Import (Java 5 and later)**:

    - If you're working with static methods or fields, you can use a static import to make them accessible without specifying the class name. For example: `import static packageName.ClassName.*;`.


11. **IDE-Specific Issues**:

    - If you are using an Integrated Development Environment (IDE), there might be IDE-specific issues or caching problems. Try rebuilding your project or restarting your IDE.


If you've reviewed these common reasons and are still having trouble accessing methods from another class, please provide more specific information about your code and the problem you're facing so that I can offer more detailed assistance.

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