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Topic: String Manipulation
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String manipulation in Java involves various operations that can be performed on strings, such as concatenation, comparison, substring extraction, conversion, and searching, among others. Java provides a rich set of methods within the
String class for these purposes. Here's a quick overview of some common string manipulation techniques in Java:1. Concatenation
Concatenating strings involves joining two or more strings end-to-end. In Java, this can be done using the
+ operator or the concat method.2. Comparison
To compare two strings for equality, you can use the
equals method. To ignore case during comparison, use equalsIgnoreCase.3. Substring
Extracting a substring involves creating a new string from a part of an existing string. Use the
substring method for this purpose.4. Conversion
You can convert the case of strings using
toUpperCase and toLowerCase.5. Searching
To find the position of a character or substring within a string, use
indexOf or lastIndexOf.6. Length
To get the length of a string (number of characters), use the
length method.7. Replacing Characters or Substrings
Replace parts of a string using the
replace method.8. Splitting Strings
To split a string into an array of substrings based on a delimiter, use the
split method.9. Trimming
Remove leading and trailing spaces from a string with
trim.10. Converting Between Strings and Arrays
Convert a string to a character array or vice versa.
Remember, strings in Java are immutable. Every time you manipulate a string, a new
String object is created. For operations involving frequent modifications, consider using StringBuilder or StringBuffer for better performance.Questions:
- 大小写变换
Solutions：
1.
- 作者:现代数学启蒙
- 链接:https://www.math1234567.com/frq06
- 声明:本文采用 CC BY-NC-SA 4.0 许可协议，转载请注明出处。
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