java 16 interview questions and answers

A non-static inner class may have object instances that are associated with instances of the class’s outer class. A static inner class does not have any object instances. In Java, inner classes are classes that are defined within another class. There are two main types of inner classes: static inner classes and non-static (also known … Read more

No. An object cannot be cast to a primitive value. In Java, you cannot directly cast a Byte object to a double value. The reason is that they are not compatible types for a direct cast. If you have a Byte object and you want to convert it to a double, you can first convert … Read more

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 … Read more

The high-level thread states are ready, running, waiting, and dead. In Java, threads can be in various high-level states, and these states are typically represented by the Thread.State enumeration. The high-level thread states in Java are as follows: NEW: A thread that has been created but not yet started with the start() method. RUNNABLE: A … Read more

A Canvas object provides access to a Graphics object via its paint() method. In Java, the Canvas class and the Graphics class are often used together for drawing graphics in a graphical user interface (GUI). Here’s the relationship between these two classes: Canvas Class: The Canvas class is part of the Abstract Window Toolkit (AWT) package (java.awt). It provides … Read more