JAVA PROGRAM • LEVEL 09 — CLASSES, OBJECTS & CONSTRUCTORS
Overload Constructors in Java
Learn overload constructors in java with a complete, compiler-ready Java 17 example.
PROBLEM UNDERSTANDING
Input and expected output
No input required
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COMPLETE JAVA 17 PROGRAM
Complete Java 17 implementation
class Box { int length,width; Box(){this(1,1);} Box(int length,int width){this.length=length;this.width=width;} int area(){return length*width;} }
class Main { public static void main(String[] args){System.out.println(new Box().area()+" "+new Box(4,5).area());} }CURRENT STEP
Select Start to walk through the important lines.
SELECTED LINE
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EXPECTED OUTPUT FOR THE SAMPLE
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PROGRAM EXPLANATION
Algorithm and explanation
- Initialize the deterministic sample values used for overload constructors in java.
- Create the required object and apply Constructor overloading and this() to its state or behavior.
- Print the final result and compare it with the documented sample output.
This Java 17 example demonstrates Constructor overloading and this() 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.