What is a Java Method

-

What is a  Java Method

1. A Java  method is a block of Java  code, it gives a block of code a name, and the code is “stored” under this name

2. The Java  method ( Java code) will not run all by itself. It will only run when it is called.

3. Java  Methods are used to run the same code many times, without having to code it many times, or retyping the code over and over and over again.

Define the code once, and use it many times!

4. You can pass data, known as parameters, into a Java  method. The parameters are input values that the Java method needs in order to fulfil its task

Example of a Java method:

 void myMethod(double length * width) {  // length and width are parameters 

          double area = length * width;

          System.out.println(“The area is “ + area);

  }

Example of a Java method call:

myMethod(2,4);

// this line send 2 and 4 as length and width to the method

// the Java method will calculate 2 * 4 and print: The area is 8


Comments

Post a Comment

Popular posts from this blog

The Seven Different Types of Coding Blocks in Java

-
Java   Coding Blocks    In Java , the term "coding block" typically refers to a block of code within certain constructs that define the scope and execution context of variables and statements. There are several types of coding blocks in Java, each serving different purposes. Here’s an overview: 1. Method Block A  Java  method block is the section of code within a method. It defines the scope of local variables and contains the statements that make up the method. public class MyClass { public void myMethod () { // Method block starts here int localVariable = 10 ; System.out.println(localVariable); // Method block ends here } } 2. Class Block A  Java  class block is the section of code within a class definition. It contains the class’s fields (variables), methods, and nested classes. public class MyClass { // Class block starts here int instanceVariable; // Field public void myMet...
Read more

What is a web application? (Lesson 7 of our Java Bootcamp)

-
  What is a  Java  web application? (During Lesson 7 of our   Java    Bootcamp, we will cover this topic in depth and create such an app )  A  Java  web application (web app) is: ·          an  application program   ·          that is stored on a remote server ·          and delivered over the internet through a browser interface.  Examples of web applications are for instance: ·          webmail, ·          online calculators, ·          and e-commerce platforms. How web applications work: Java  web applications are accessed over a network.  That means, users don't need to download a web application.  Instead, they can conveniently access the  Java...
Read more

How big is an int in Java

-
Image
Integer Data types in  Java   // 8 bits // -128 to 127 0000 0001 b = -128; System.out.println("b " + b); b = 127; System.out.println("b " + b); // short integer  in Java // 00000000 00000000 short s = (short)b; // 16 bit // cast from a number datatype to another number datatype s = 500; b = (byte)s; System.out.println("b " + b); // int in  Java // 00000000 00000000 00000000 00000001 int i = (int)s ; // 32 bit ; binary integer 0 1 ; 00000000 8 bits= 1byte // long integer in  Java // 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000001 long l = (long)i; // 64-bit // float in  Java // single-precision 32-bit // 0 and manitissa of 23 bits and exponent of 8 bits // 0.01234567900123456789012 x 10*12345678 float f = 0.0f; // double in  Java double d = 3048575658.00 * 728348716381.00; // double-precision 64-bit d = (double) f; // cast float to double double-precision 64-bit
Read more