Java String Handling: Common Methods of the String Class for Text Operations

In Java, the `String` class is fundamental for handling text, essentially a sequence of characters, with the core characteristic of **immutability** (content modification generates a new object). Common methods include: `length()`/`charAt()` to get length and specified characters; `concat()` or `+` for string concatenation; `equals()` to compare content (avoid `==`, which compares addresses); `substring()` to extract substrings; `replace()` to substitute characters/substrings; `trim()` to remove leading/trailing spaces; `split()` to split by delimiters; `toLowerCase()`/`toUpperCase()` for case conversion; `isEmpty()`/`isBlank()` to check for empty/blank strings. Note: Use `StringBuilder` for frequent modifications; escape special characters in delimiters (e.g., `split("\\.")`). Mastering these basic methods satisfies most text operations, and continuous learning enhances efficiency.