✏️ Explanatory Question

[Primitive Values, Wrapper Classes, Types and Casting]

While using Wrapper classes, we do not need to import any package. Give a reason.

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📘 Detailed Answer
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← Previous [Primitive Values, Wrapper Classes, Types and Casting] What gets printed? char[] set = {'*','D','5'}; System.out.print(Character.isDigit(set[2]) + " "); System.out.print(Character.isWhitespace(set[0]) + " "); System.out.print(Character.isLetterOrDigit(set[1]));
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Answer with Explanation

Because Wrapper classes are part of the java.lang package, which is imported automatically by Java.

Understanding Wrapper Classes:

Wrapper classes convert primitive data types into objects.

Primitive Type Wrapper Class
int Integer
double Double
char Character

java.lang Package:

All wrapper classes belong to the:

java.lang package

Important Feature of java.lang:

  • Automatically imported in every Java program
  • No need to write import java.lang.*;

Example:

Double d = Double.parseDouble("12.5");

Here, no import statement is required.

Why This Works:

Point Explanation
Wrapper classes location java.lang package
Package behavior Auto-imported by default

Conclusion:

  • Wrapper classes are in java.lang
  • java.lang is automatically available
  • Hence, no import statement is required ✅
← Previous [Primitive Values, Wrapper Classes, Types and Casting] What gets printed? char[] set = {'*','D','5'}; System.out.print(Character.isDigit(set[2]) + " "); System.out.print(Character.isWhitespace(set[0]) + " "); System.out.print(Character.isLetterOrDigit(set[1]));