All Flashcards
How is string reversal used?
Palindrome checking, data encryption, and reversing words in a sentence.
How is substring checking used?
Text searching, content filtering, and code analysis.
How are string methods used in data validation?
Checking format, length, and allowed characters.
How are string algorithms used in bioinformatics?
Sequence alignment, gene finding, and protein analysis.
How are string algorithms used in search engines?
Indexing, query processing, and ranking results.
How is string manipulation used in web development?
Form validation, URL parsing, and dynamic content generation.
How is string processing used in natural language processing (NLP)?
Tokenization, stemming, and sentiment analysis.
How are string algorithms used in cybersecurity?
Password hashing, intrusion detection, and malware analysis.
How is string manipulation used in data science?
Data cleaning, feature extraction, and text mining.
How are string functions used in file processing?
Parsing file names, extracting data from text files, and manipulating file paths.
What does the following code output?
java
String s = "abc";
System.out.println(s.substring(1, 3));
bc
Identify the error in the following code:
java
String s = "hello";
for (int i = 0; i <= s.length(); i++) {
System.out.println(s.charAt(i));
}
IndexOutOfBoundsException: Loop should be i < s.length().
What does the following code output?
java
String s1 = "hello";
String s2 = new String("hello");
System.out.println(s1.equals(s2));
true
What does the following code output?
java
String s = "world";
String result = "";
for (int i = 0; i < s.length(); i++) {
result = result + s.charAt(i);
}
System.out.println(result);
world
Identify the error in the following code:
java
String s = "test";
System.out.println(s.substring(2, 1));
StringIndexOutOfBoundsException: endIndex cannot be less than beginIndex.
What does the following code output?
java
String s = "apple";
System.out.println(s.length());
5
What does the following code output?
java
String s = "OpenAI";
System.out.println(s.substring(4));
AI
Identify the error in the following code:
java
String s = null;
System.out.println(s.length());
NullPointerException: Cannot call length() on a null string.
What does the following code output?
java
String s1 = "hello";
String s2 = "Hello";
System.out.println(s1.equals(s2));
false
What does the following code output?
java
String s = "programming";
System.out.println(s.indexOf("gram"));
3
Why use loops with strings?
To iterate through characters and substrings.
Explain string indexing.
Accessing characters by their position in the string.
What is the core idea of string reversal?
Building a new string by prepending characters.
How does a 'sliding window' work?
It extracts all substrings of a given length by moving one character at a time.
Why is equals() preferred over == for strings?
equals() compares content; == compares references.
Why is tracing important?
Helps visualize the process and catch errors early.
What is the importance of boundary conditions?
Ensuring algorithms work correctly at the start and end of strings.
What is the role of immutability in string manipulation?
Requires creating new strings for modifications.
Why is string searching important?
Fundamental in text processing and pattern recognition.
What is the time complexity of basic string operations?
Varies, but often O(n) for operations like searching or reversal.