Advantages of String Implementation in Java:
- Compilation creates a unique string. At compilation time, the string is resolved as far as possible. This includes applying a combined operator and converts other literals to strings. So “Hi7” and (“Hi” +7) are both completed at the same compilation time and are identical objects in the class string set. Compilers differ in their ability to achieve this resolution. You can always check your compiler (eg, by decompiling several statements involving combined) and change it if needed.
- Because string objects have not changed, substring operations do not need to copy the entire sequence of the underlying character. Instead, substrings can use the same char array as the original string and only refer to the starting point and different endpoints in the char array. This means that substring operations are efficient, in the form of fast memory and conservation; An additional object is just a wrapper on the underlying Char Array with a different pointer into the array.
- Strings are implemented in JDK as an internal char array with an offset index (actually starting offset and a number of characters). This basic structure is very unlikely to be changed in any Java version.
- Strings have strong support for internationalization. Need great efforts to reproduce internationalization support for alternative classes.
- A close relationship with StringBuffer allows strings to refer to the same char array used by StringBuffer. This is a two-edged sword. For general practices, when you use StringBuffer to manipulate and add characters and data types and then convert the final results to the string, this works well. StringBuffer provides an efficient mechanism for growing, inserting, adding, change, and other types of string manipulation. The resulting string then efficiently refers to the same char array without copying additional characters. It is very fast and reduces the number of objects used to a minimum of possible by avoiding intermediary objects. However, if the StringBuffer object is then changed, Array Char in the StringBuffer copied into the new char array which is now referred to by the StringBuffer. String objects maintain a reference to the previously distributed Array char. This means that copying overhead can occur at an unexpected point in the application. Instead of copying that occurs in the call of the tostring method (), as expected, the next change from the StringBuffer causes the newly created char array and a copy of the array is carried out. To make overhead copying occurs at a predictable time, you can explicitly execute several methods that make copying occur, such as StringBuffer.set length (). This allows StringBuffer to reuse with more predictable performance.
The disadvantage of the string implementation is:
- Unable to bend strings means that it is not possible to add behavior to strings for your own needs.
- Previous points mean that all access must go through limited sets of the current string method available, forcing extra overhead.
- The only way to increase the number of methods that allow efficient string character manipulation is to copy characters into your own array and manipulate directly, in terms of strings that impose extra steps and additional objects that you might not need.
- Array Char is faster to be processed directly.
- Strict clutch with StringBuffer can cause unexpected high memory usage. When StringBuffer.tostring () makes a string, the underlying array currently holds the string, regardless of the size of the array (i.e., StringBuffer capacity). For example, StringBuffer with a capacity of 10,000 characters can make a string of 10 characters. However, string 10 characters continue to use a 10,000-char array to store 10 characters. If the StringBuffer is now reused to create a string of 10 other characters, StringBuffer first creates a new 10th internal
Conclusion
In this blog you learn about the Advantage And Disadvantages Of String Implementation In JAVA.
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