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All Flashcards
What does the following code output?
```java
String str = "Hello";
int len = str.length();
System.out.println(len);
```
5
What does the following code output?
```java
String str = "Peter Cao";
String sub1 = str.substring(0, 5);
System.out.println(sub1);
```
Peter
What does the following code output?
```java
String str1 = "hello";
String str2 = "Hello";
boolean isEqual = str1.equals(str2);
System.out.println(isEqual);
```
false
What does the following code output?
```java
String str1 = "apple";
String str2 = "banana";
int result = str1.compareTo(str2);
System.out.println(result > 0);
```
false
What does the following code output?
```java
String s6 = "hello world";
int pos = s6.indexOf("l");
System.out.println(pos);
```
2
What does the following code output?
```java
String s3 = "cat";
String s2 = s3.substring(1,3);
System.out.println(s2);
```
at
What does the following code output?
```java
String s5 = "Blue";
String s6 = "Blue";
int answer = s5.compareTo(s6);
System.out.println(answer);
```
0
What does the following code output?
```java
String str = "Coding";
String sub = str.substring(1, 4);
System.out.println(sub);
```
odi
What does the following code output?
```java
String text = "programming";
int index = text.indexOf("m");
System.out.println(index);
```
7
What does the following code output?
```java
String s4 = "hello";
String s2 = s4.substring(3);
System.out.println(s2);
```
lo
How are string methods applied in data validation?
To check if input data matches a specific format or criteria.
How are string methods used in search engines?
To index and search for keywords within documents.
How are string methods used in DNA sequencing?
To analyze and compare genetic sequences, identifying patterns and variations.
How are string methods used in social media sentiment analysis?
To process and analyze text data to determine the emotional tone or attitude expressed.
How are string methods used in bioinformatics?
String methods are used to analyze and manipulate DNA and protein sequences, which are represented as strings of characters.
How are string methods used in cryptography?
String methods are used to manipulate and process text during encryption and decryption.
How are string methods used in web development?
String methods are used to process and manipulate text data for user input, output, and data storage.
How are string methods used in natural language processing (NLP)?
String methods are used to tokenize, parse, and analyze text data.
How are string methods used in compiler design?
String methods are used to parse and analyze source code.
How are string methods used in database management?
String methods are used to store, retrieve, and manipulate text data in databases.
Why is string manipulation important?
It allows you to process, modify, and extract information from text data.
What is the significance of zero-indexing in Java?
It affects how you access characters and substrings within a string.
How does `equals()` differ from using `==` for string comparison?
`equals()` compares the content of the strings, while `==` compares the memory addresses.
What does lexicographical order mean?
Alphabetical order, considering character encoding (e.g., ASCII or Unicode).
What is the purpose of using external libraries and APIs?
To extend Java's capabilities with pre-written code, saving time and effort.
Why is understanding Java documentation important?
It provides essential information on how to use classes, methods, and APIs correctly.
How do you access the nth character of a string?
Use `str.substring(n-1, n)` due to zero-indexing.
What is the return type of the `length()` method?
int
What is the return type of the `equals()` method?
boolean
What is the return type of the `compareTo()` method?
int