All Flashcards
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 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
What are the differences between creating a String with a literal and using the new keyword?
Literal: potentially reuses existing strings. new: always creates a new object.