Q1
What does length() do?
AFinds a string's length
BExtracts a substring
CCompares strings
DConverts case
ICSEClass 10 (ICSE)Computer ApplicationsCh 4 · Topic 1
String Handling
Java's String class provides many built-in methods for manipulating text, like finding length, extracting substrings, and comparing strings.
Core concept
Common String methods include length() (finds string length), charAt() (gets a character at a position), and substring() (extracts part of a string).
How it works
String comparison uses equals() (checks if strings are identical) rather than == (which compares object references, not content).
Why it matters
Methods like toUpperCase() and toLowerCase() convert string case, while trim() removes extra spaces from the beginning and end.
Key detail
Understanding String handling methods is essential for processing and manipulating text data in Java programs.
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Quick notes
• length() finds a string's length.
• charAt() gets a character at a position.
• substring() extracts part of a string.
• equals() compares string content correctly.
• == compares references, not content.
• toUpperCase()/toLowerCase() convert case.
• trim() removes extra spaces.
• String methods are essential for text processing.