Chapter 10: Problem 30

What wrapper class methods convert a number from decimal to another numbering system? What wrapper classes are these methods a member of?

Short Answer

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Answer: The wrapper class methods `toBinaryString()` and `toString(int number, int radix)` of the Integer wrapper class can be used to convert decimal numbers to other numbering systems such as binary, octal, or hexadecimal.

Step by step solution

Introduction to Wrapper Classes

Wrapper classes in Java provide a way to use primitive data types (such as int, char, double, etc.) as objects. They "wrap" the primitive data types in an object, hence their name wrapper classes. Examples of wrapper classes include Integer, Double, Character, and so on.

Wrapper Class Methods for Numbering System Conversion

Two methods in certain wrapper classes allow the conversion of a number from a decimal system to another numbering system: the `toBinaryString()` method, which converts a decimal number to binary, and the `toString(int number, int radix)` method, which can convert a decimal number to any base, like binary, octal, and hexadecimal.

toBinaryString() Method: Working and Wrapper Class

The `toBinaryString()` method accepts an integer value as an argument and converts it into a binary string representation. It is a static method of the Integer wrapper class. It can be used as follows: ```java int decimalNumber = 10; String binaryNumber = Integer.toBinaryString(decimalNumber); ```

toString(int number, int radix) Method: Working and Wrapper Class

The `toString(int number, int radix)` method accepts two integer values as arguments: `number`, which is the decimal value to be converted, and `radix`, the base to convert the number into. This method is also part of the Integer wrapper class. It can be used as follows: ```java int decimalNumber = 10; int base = 8; //example for octal conversion String octalNumber = Integer.toString(decimalNumber, base); ```

Summary

In conclusion, the wrapper class methods for converting a decimal number to another number system are `toBinaryString()` and `toString(int number, int radix)`. Both of these methods are part of the Integer wrapper class.

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What wrapper class methods convert a number from decimal to another numbering system? What wrapper classes are these methods a member of?

Short Answer

Step by step solution

Introduction to Wrapper Classes

Wrapper Class Methods for Numbering System Conversion

toBinaryString() Method: Working and Wrapper Class

toString(int number, int radix) Method: Working and Wrapper Class

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