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Chapter 10: Problem 13

\(\mathrm{What}\) is the difference between the getchars and toCharArray methods?

Short Answer

Expert verified
The main differences between the getchars and toCharArray methods in Java are: 1. The getchars method copies a substring of the given string into an existing character array, while the toCharArray method creates a new character array containing the entire content of the given string. 2. The getchars method requires input parameters (srcBegin, srcEnd, dst, and dstBegin) to specify beginning and ending indexes as well as the destination array and index, whereas the toCharArray method does not need any input parameters.

Step by step solution

01

Summary of getchars method

The getchars method is a method of the String class in Java that takes a substring of the given string, starting from a specified beginning index to the end index, and copies the characters into an existing character array starting at a specified destination index. The syntax for this method is as follows: `void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)` where - srcBegin: the beginning index of the substring - srcEnd: the ending index of the substring - dst: the destination character array - dstBegin: the starting index in the destination character array
02

Summary of toCharArray method

The toCharArray method is also a method of the String class in Java that returns a newly created character array containing the characters of the given string. Unlike the getchars method, toCharArray does not require input parameters and simply returns a new character array filled with the given string's characters. The syntax for this method is as follows: `char[] toCharArray()`
03

Example usage of getchars method

Let's see an example of using the getchars method: ```java String str = "Hello, World!"; char[] charArray = new char[5]; str.getChars(0, 5, charArray, 0); ``` In this example, the getchars method takes the substring "Hello" from the string "Hello, World!" and copies its characters into the charArray, which will contain the characters {'H', 'e', 'l', 'l', 'o'}.
04

Example usage of toCharArray method

Now, let's see an example of using the toCharArray method: ```java String str = "Hello, World!"; char[] charArray = str.toCharArray(); ``` In this example, the toCharArray method creates a new character array containing the entire content of the string "Hello, World!", and the charArray will contain the characters {'H', 'e', 'l', 'l', 'o', ',', ' ', 'W', 'o', 'r', 'l', 'd', '!'}.
05

Key differences between getchars and toCharArray methods

Based on the explanations and examples provided, we can point out the following key differences between the getchars and toCharArray methods: 1. The getchars method copies a substring of the given string into an existing character array, whereas the toCharArray method creates a new character array containing the entire content of the given string. 2. The getchars method requires input parameters (srcBegin, srcEnd, dst, and dstBegin), while the toCharArray method does not need any input parameters.

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