JAVA PROGRAM • LEVEL 09 — CLASSES, OBJECTS & CONSTRUCTORS
Build Objects with Composition in Java
Learn build objects with composition in java with a complete, compiler-ready Java 17 example.
PROBLEM UNDERSTANDING
Input and expected output
No input required
Asha - Hyderabad
COMPLETE JAVA 17 PROGRAM
Complete Java 17 implementation
class Address { String city; Address(String city){this.city=city;} }
class Student { String name; Address address; Student(String name,Address address){this.name=name;this.address=address;} }
class Main { public static void main(String[] args){Student student=new Student("Asha",new Address("Hyderabad"));System.out.println(student.name+" - "+student.address.city);} }CURRENT STEP
Select Start to walk through the important lines.
SELECTED LINE
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EXPECTED OUTPUT FOR THE SAMPLE
Asha - Hyderabad
PROGRAM EXPLANATION
Algorithm and explanation
- Initialize the deterministic sample values used for build objects with composition in java.
- Create the required object and apply Composition and Has-a relationship to its state or behavior.
- Print the final result and compare it with the documented sample output.
This Java 17 example demonstrates Composition and Has-a relationship through a complete, executable program. The values are intentionally small so students can trace each statement, verify the output, and then modify the example safely in the online compiler.
EFFICIENCY
Time and space complexity
O(1)
O(1)
DEBUGGING CHECKLIST
Common mistakes
Keep the class name Main and the entry method signature public static void main(String[] args) when using the online compiler.
Create an object before accessing instance members; static members can be accessed through the class name.
Java is case-sensitive, and every statement that requires a semicolon must end with one.