An object reference be cast to an interface reference when the object implements the referenced interface. In Java, an object reference can be cast to an interface reference when the object’s class implements that interface. This is possible because Java supports polymorphism through interfaces. Here’s a brief explanation: When the Object Implements the Interface: If a class implements an interface, you can cast an object of that class to a reference of the interface type. java interface MyInterface { void…

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The read() method returns -1 when it has reached the end of a file. In Core Java, the read() method of the InputStream class returns an integer value. When it reaches the end of a file, it typically returns -1 to indicate the end of the stream. Here’s a simple example: java import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; public class ReadFileExample { public static void main(String[] args) { try (InputStream inputStream = new FileInputStream(“example.txt”)) { int data; while ((data = inputStream.read()) != -1) {…

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