What are the default values for instance variables of the following types Int double & float boolean Object

Instance variables in Java have default values based on their data type:

1. **int**: There isn't a built-in default value for primitive integer types like int. You must initialize them with an explicit value, otherwise they will contain garbage values which can vary depending on the system.

2. **double** & **float**: These floating-point types also don't have a default value. They must be initialized, as uninitialized double and float variables will hold indeterminate values (NaN - Not-a-Number).

3. **boolean**: A boolean variable has two possible default values: `false`. If you don't assign a value during declaration, it assumes `false`.

4. **Object**: For objects, if you declare an instance variable without initializing, it may depend on whether you've declared it inside a constructor. If not, it will be null by default. It's considered best practice to provide a meaningful default value or initialize it in the constructor.

Remember, assigning a value to an instance variable in the constructor is a common way to ensure a well-defined initial state:

public class MyClass {
    private String myString; // Default is null

    public MyClass() {
        myString = ""; // Or any desired default value
    }
}