Java Programming Intermediate Quiz 4
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Intermediate Quiz 4
1. Which method is used to remove all elements from an ArrayList?
clear()
removeAll()
deleteAll()
2. What is the output of: System.out.println("A".compareTo("B"));
-1
0
1
3. Which Map implementation maintains insertion order?
LinkedHashMap
HashMap
TreeMap
4. How do you synchronize a block of code?
Use synchronized keyword
Use static keyword
Use volatile keyword
5. What is the result of: 10 % 3?
1
3
0
6. Which method is used to get the current thread?
Thread.currentThread()
Thread.getCurrent()
Thread.now()
7. How do you declare a two-dimensional array of ints?
int[][] arr = new int[3][4];
int arr[3][4];
int arr = int[3][4];
8. Which stream is used for object serialization?
ObjectOutputStream
FileOutputStream
DataOutputStream
9. What is the purpose of the transient keyword?
Prevents a variable from being serialized
Makes a variable static
Allows a variable to change type
10. Which class is used for mutable strings?
StringBuilder
String
StringBuffer
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