What does the following code output?
String str1 = "hello";
String str2 = "hello";
System.out.println(str1 == str2);
true
What does the following code output?
String str1 = new String("hello");
String str2 = new String("hello");
System.out.println(str1 == str2);
false
What does the following code output?
String str1 = new String("hello");
String str2 = new String("hello");
System.out.println(str1.equals(str2));
true
Why are strings in Java objects?
They belong to the String class, providing built-in methods for manipulation.
What is the difference between using `==` and `.equals()` to compare strings?
`==` compares references, `.equals()` compares content.
Explain string immutability.
Strings cannot be changed after creation; any modification creates a new String object.
Why are pre-initialized strings more efficient?
Java can reuse them, avoiding the creation of new objects for identical string literals.
What is a String in Java?
An object representing a sequence of characters.
What is a String literal?
A sequence of characters enclosed in double quotes.
What is the String class?
A class in Java used to create and manipulate strings.
Define pre-initialized String.
A string created using double quotes, e.g., String str = "text";
Define String constructor.
Creating a string object using the `new` keyword, e.g., String str = new String("text");
