Example 1: Generate a Simple Java Program
// Write a Java program that prints "Hello, GitHub
Copilot!"
Example 2: Generate a Java Method
Write a Comment
// Write a Java method to calculate factorial of a number
Example 3: Generate a Java Class with Getters &
Setters
Let's create a User class with name, age, and
their respective getters and setters
// Create a User class with name and age attributes, and
generate getters and setters
Example 4: Generate a Java Class with Open Google website
and verify the title .
Summary
✅ Use Copilot to autocomplete
code by typing comments.
✅ Generate functions, classes,
and even full programs with minimal effort.
✅ Boost your coding speed and
learn Java faster.
Step 3: Generate Code with GitHub Copilot
Example 1: Generate a Simple Java Program
🔹 Start by typing a
comment, and let Copilot suggest code
👉 Step 3.1: Write a
Comment in Main.java
// Write a Java program that prints "Hello, GitHub
Copilot!"
👉 Step 3.2: Press Enter
& Accept the Suggested Code
public class Main {
public static void
main(String[] args) {
System.out.println("Hello, GitHub Copilot!");
}
}
🛠 Example 2: Generate a
Java Method
Let's generate a method that calculates the factorial of
a number.
👉 Step 3.1: Write a
Comment
// Write a Java method to calculate factorial of a number
👉 Step 3.2: Copilot
Suggests the Following Code
public class FactorialCalculator {
public static int
factorial(int n) {
if (n == 0 ||
n == 1) {
return 1;
}
return n *
factorial(n - 1);
}
public static void
main(String[] args) {
int num = 5;
System.out.println("Factorial of " + num + " is: " +
factorial(num));
}
}
🔹 Output when you run the
program:
Factorial of 5 is: 120
🛠 Example 3: Generate a
Java Class with Getters & Setters
Let's create a User class with name, age, and
their respective getters and setters.
👉 Step 3.1: Write a
Comment
// Create a User class with name and age attributes, and
generate getters and setters
👉 Step 3.2: Copilot
Generates Code
java
CopyEdit
public class User {
private String
name;
private int age;
public User(String
name, int age) {
this.name =
name;
this.age =
age;
}
public String
getName() {
return name;
}
public void
setName(String name) {
this.name =
name;
}
public int
getAge() {
return age;
}
public void
setAge(int age) {
this.age =
age;
}
public static void
main(String[] args) {
User user =
new User("Alice", 25);
System.out.println("Name: " + user.getName());
System.out.println("Age: " + user.getAge());
}
}
🔹 Output:
Name: Alice
Age: 25
Java Code Review Checklist
- Clean
Code
- Naming
Conventions (classes, constants, variables, methods (void vs return),
etc)
- No
hard-coded variables
- Indentation
- No
spelling mistakes
- The
code does what it says it does
- The
code is easy to read (Readability)
- Avoid
duplicate code
- Check
if the code could be replaced by calling functions in other
libraries/components
- Best
Practices
- OOP
Principles are correctly used
- The
code follows the SOLID PRINCIPLES
- Design
Patterns
- Recommend
a design pattern when you fill that a pattern could fit there
- Exception
Handling
- Ensure
that each exception is raised and handled correctly
- Ensure
that you have a well-defined exception hierarchy
- Split
the exceptions in two types: technical and business
package org.example.pages;
public class CodeReviewTestClass {
public void addnunbers(int a) {
int c =200;
int sum = a + c;
System.out.println("Sum
of two numbers is: " + sum);
}
public void addoftwonunbers(int a,
int b) {
int sum = a + b;
System.out.println("Sum
of two numbers is: " + sum);
int c =200;
int sum1 = a + c;
System.out.println("Sum
of two numbers is: " + sum1);
}
public void suboftwonunbers(int a,
int b) {
int sub = a - b;
System.out.println("Subtraction
of two numbers is: " + sub);
int mul = a * b;
System.out.println("Multiplication
of two numbers is: " + mul);
int div = a / b;
System.out.println("Division
of two numbers is: " + div);
}
public void PrintLargeNumber(int a,
int b,int c, int d, int f, int e,int g,int h) {
System.out.println("
print largest number ");
}
public String GetStringMethod(String
str){
String str2 =null;
System.out.println(" print str
value ");
return str2;
}
public void finddupwords(){
String string = "Big black
bug bit a big black dog on his big black nose";
int count;
//Converts the string into
lowercase
string =
string.toLowerCase();
//Split the string into words
using built-in function
String words[] =
string.split(" ");
System.out.println("Duplicate
words in a given string : ");
for(int i = 0; i <
words.length; i++) {
count = 1;
for(int j = i+1; j <
words.length; j++) {
if(words[i].equals(words[j])) {
count++;
//Set words[j] to
0 to avoid printing visited word
words[j] =
"0";
}
}
//Displays the duplicate
word if count is greater than 1
if(count > 1
&& words[i] != "0")
System.out.println(words[i]);
}
}
}
}
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