[Solved] Identify the error in the following Java code snippet:class Box { int length; Box() { this(5); } Box(int length) { length = length; } } | Java

Java - Constructors

Identify the error in the following Java code snippet:

class Box {
  int length;
  Box() {
    this(5);
  }
  Box(int length) {
    length = length;
  }
}

AThe constructor call this(5) must be the first statement

BMissing return type in constructors

CCannot overload constructors in Java

DThe assignment length = length does not assign the parameter to the instance variable

Step-by-Step Solution

Solution:

Step 1: Analyze constructor chaining
The call this(5); is correctly placed as the first statement in the no-arg constructor.
Step 2: Check variable assignment
In Box(int length), the assignment length = length; assigns the parameter to itself, not to the instance variable.
Step 3: Correct assignment
Use this.length = length; to assign the parameter to the instance variable.
Final Answer:
The assignment length = length does not assign the parameter to the instance variable -> Option D
Quick Check:
Use this.variable to assign parameter to instance variable [OK]

Quick Trick: Use this.var to assign parameter to instance variable [OK]

Common Mistakes:

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