- What is Polymorphism in Java?
- Can you have more than one public class in a Java file?
- Why can’t we have multiple public classes in a Java source file?
- Can a class be private in Java?
- How do you connect two classes in Java?
- What does float a 35 0 return mean?
- Can two main () method in Java class?
- How do you extend multiple classes in Java?
- Can there be multiple classes in Java?
- How many classes can a Java program have?
- Which method Cannot be overridden?
- Can a dead thread be restarted?
- What is static in Java?
- Can a package have more than one public class?
- What is public class in Java?
What is Polymorphism in Java?
Polymorphism means “many forms”, and it occurs when we have many classes that are related to each other by inheritance.
Polymorphism uses those methods to perform different tasks.
This allows us to perform a single action in different ways..
Can you have more than one public class in a Java file?
No, while defining multiple classes in a single Java file you need to make sure that only one class among them is public. If you have more than one public classes a single file a compile-time error will be generated.
Why can’t we have multiple public classes in a Java source file?
There can be only one public class in a java file because the name of java file is same as the name of public class. And obviously we can’t have a file with two different names.
Can a class be private in Java?
No, we cannot declare a top-level class as private or protected. It can be either public or default (no modifier). If it does not have a modifier, it is supposed to have a default access.
How do you connect two classes in Java?
Using Multiple Classes Like we specified in the Classes chapter, it is a good practice to create an object of a class and access it in another class. Remember that the name of the java file should match the class name. In this example, we have created two files in the same directory: Main.
What does float a 35 0 return mean?
10) What does the expression float a = 35 / 0 return? Explanation: In Java, whenever we divide any number (double, float, and long except integer) by zero, it results in infinity. … But on dividing an integer by zero, it throws a runtime exception, i.e., java.lang.ArithmeticException.
Can two main () method in Java class?
A class can define multiple methods with the name main. The signature of these methods does not match the signature of the main method. These other methods with different signatures are not considered the “main” method. Yes it is possible to have two main() in the same program.
How do you extend multiple classes in Java?
Extending Multiple Interfaces A Java class can only extend one parent class. Multiple inheritance is not allowed. Interfaces are not classes, however, and an interface can extend more than one parent interface. The extends keyword is used once, and the parent interfaces are declared in a comma-separated list.
Can there be multiple classes in Java?
You can create as many classes as you want, but writing many classes in a single file isn’t recommended, as it makes code difficult to read. Instead, you can create a separate file for every class.
How many classes can a Java program have?
A single Java program contains two or more classes, it is possible in two ways in Java.
Which method Cannot be overridden?
A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.
Can a dead thread be restarted?
Once a thread enters dead state it cannot be restarted.
What is static in Java?
In the Java programming language, the keyword static indicates that the particular member belongs to a type itself, rather than to an instance of that type. This means that only one instance of that static member is created which is shared across all instances of the class.
Can a package have more than one public class?
2 Answers. There can be more than one public class in package, but each public class needs to be declared in its own . java file. If you want these public classes that are in different .
What is public class in Java?
A Java public keyword is an access modifier. It can be assigned to variables, methods, constructors, and classes. It is the most non-restricted type of access modifier.