Java Methods

Question 1

What is a method in Java?

Answer 1

A method is a block of code which only runs when it is called.

Question 2

Where are methods created in java?

Answer 2

Methods are typically created inside classes or in interfaces. A method in an interface doesn’t not include a code block.

Question 3

What is the static modifier for a Java Methods?

Answer 3

Static means the method belongs to the class and not to an object that is created

Question 4

What is the void modifier in Java?

Answer 4

It means the method does not return a value

Question 5

What are parameters in methods in Java?

Answer 5

Information can be passed to methods as parameter. Parameters act as variables inside the method.

Question 6

What is required for a parameter?

Answer 6

Need to have the data type and the variable name

Question 7

Describe a Method in Java

Answer 7

public class MyClass {
  static void myMethod() {
    // code to be executed
  }
}

Question 8

Describe a method with a parameter

Answer 8

public class MyClass {
  static void myMethod(String fname, int age) {
    System.out.println(fname + " is " + age);
  }

  public static void main(String[] args) {
    myMethod("Liam", 5);
    myMethod("Jenny", 8);
    myMethod("Anja", 31);
  }
}

// Liam is 5
// Jenny is 8
// Anja is 31

Question 9

What is method overloading?

Answer 9

Method overloading is the process of using the same method with using a different number of parameters to designate which version of the method is used.

Question 10

What is the main method?

Answer 10

The main method is the method the compiler looks for when it runs a Java program.

Question 11

What are java string methods?

Answer 11

In the string class there are several built in methods that enable the modification and manipulation of string.

Question 12

What are Java Math Methods?

Answer 12

There are built in method in the java class that can be used for Math functions

Question 13

What are access modifiers in methods in java?

Answer 13

There restrict what has access to the methods in Java or define the process in giving access to these methods.

Question 14

What the the access modifiers in java methods?

Answer 14

1- Private
2- Default
3- Public
4 - Private

Question 15

What are non-access modifiers in Java?

Answer 15

Java provides a number of non-access modifiers to achieve many other functionalities.

The static modifier for creating class methods and variables.

The final modifier for finalizing the implementations of classes, methods, and variables.

The abstract modifier for creating abstract classes and methods.

The synchronized and volatile modifiers, which are used for threads.

Question 16

Where should methods be placed in a class?

Answer 16

best practice is to place the methods below the variables and or main method

Question 17

What is a constructor in Java?

Answer 17

A constructor in Java is a special method that is used to initialize objects. The constructor is called when an object of a class is created. It can be used to set initial values for object attributes:

Question 18

When is a constructor initialized?

Answer 18

It is typically initiated within the class

Question 19

What is the Super method?

Answer 19

super keyword can also be used to access the parent class constructor. One more important thing is that, ‘’super’ can call both parametric as well as non parametric constructors depending upon the situation. Following is the code snippet to explain the above concept

Question 20

what are constructor parameters?

Answer 20

Constructors can also take parameters, which is used to initialize attributes.

The following example adds an int y parameter to the constructor. Inside the constructor we set x to y (x=y). When we call the constructor, we pass a parameter to the constructor (5), which will set the value of x to 5: