Download COMP 308 JAVA FOR PROGRAMMERS FINAL ACTUAL EXAMINATION TEST 2026 TIPS POSSIBLE QUESTIONS A and more Exams Object Oriented Programming in PDF only on Docsity!
COMP 308 JAVA FOR PROGRAMMERS
FINAL ACTUAL EXAMINATION TEST 2026
TIPS POSSIBLE QUESTIONS ANSWERS
GRADED A+
⩥ int n1 = 12; int n2 = 5; int n3 = ++n1 - n1--; What is the result of the code above? Answer: n3 = 8 and n2 = 4 and n = 13 ⩥ Identify the statements that correctly increase the variable amount by
- Select ALL that apply. Answer: Amount += 2; Amount = amount + 2; ⩥ Identify the components of object-oriented programming in Java. Select ALL that apply. Answer: Encapsulation Inheritance Abstraction Polymorphism
⩥ Identify the "blueprint" from which individual Java objects are created. Answer: Class ⩥ This contains the JVM and Java Class Library. Answer: JRE ⩥ Simple data types for storing integers, real numbers, characters and Booleans are called ____?____ in Java. Answer: primitives ⩥ int result = 3 / 10; What is the result of the code above? Answer: 0 is stored in result ⩥ long loan = 1234; int number = loan; The code above does not compile. How could the code be corrected? Select ALL that apply. Answer: Add a cast to long Add a cast to int ⩥ Identify the correct Java variable assignment statements. Select ALL that apply. Answer: int bin = 0b111; double cost = 2_345.5_; double num - 1_00_0.0_0;
d. A compiled Java filename has a .class extension. ⩥ A device needs a ____ to run a Java program Answer: JVM ⩥ Identify the true statements about Java. Select ALL that apply. Answer: a. Java is case-sensitive b. A java program must have at least one class c. Java programs execute from the main method d. The name of a public Java Class must match its filename e. Java class names should begin with an upper case alphabet character ⩥ What term is used to describe compiled Java code? Answer: Bytecode ⩥ Source code file Hello.java has been compiled. Which one of these will execute it? Answer: java Hello ⩥ Where are Java used programs used? Select ALL that apply. Answer: a. In some mobile devices b. On web servers c. In some modern motor vehicles d. In some kitchen appliances
⩥ Identify the legal Java identifiers. Select ALL that apply. Answer: a. CanOfWorms b. _firstname c. $price ⩥ Which one will compile a Java source code file named Test.java? Answer: javac Test.java ⩥ Identify the popular features of Java. Select ALL that apply. Answer: a. Java is object-oriented. b. Java can be embedded in Web pages. c. Java is platform independent ⩥ Identify the data type(s) that can be used in a Java switch expression. Select ALL that apply. Answer: a. String b. Short c. Int d. Char ⩥ 1. Identify the relational operators. Select ALL that apply. Answer: a. <= b. == c. >
System.out.print(++var2); What is printed by the code above? Answer: 2 ⩥ int x = 3; int y = 5; int z = x++ > --y? x : y; System.out.print(z); What (if anything) is printed? Answer: 4 ⩥ int x, y = 1; x = 10; if(x != 10 && x / 0 == 0) System.out.println(y); Else System.out.println(++y); What is the output of the code above? Answer: 2 ⩥ Boolean odd = 12 % 2 == 1; If (odd = false) System.out.println("odd"); Else System.out.println("Even");
What is printed (if anything) by the code above? Answer: Even ⩥ Which of these operators might not have to evaluate the right hand operand? Answer: || ⩥ Identify the true statements about Java strings. Select ALL that apply. Answer: a. String is a reference type. b. Java strings are mutable. c. String is a class. d. A String object can be instantiated without using new. e. Strings once made cannot be made larger or smaller ⩥ What is the result of this statement? System.out.println(1 + 2 + "b"); Answer: 3b ⩥ String a = "4"; A+="5"; A+=6; System.out.print(a); Answer: 456 ⩥ String s1 = "Hello world"; String s2 = s1; Answer: a. The s2 variable holds the string "Hello world".
⩥ The Java continue statement causes execution to skip to Answer: The next iteration in the loop ⩥ Int n; For(n=8; n < 30; n += 5) { // } System.out.print(n); What is printed when the loop above has finished? Answer: 33 ⩥ For (int n = 0; n <= 12; n++) { System.out.print(n + ""); } System.out.println(n); What is the output of line 7? Answer: Nothing. Compilation fails ⩥ For(int I = 0; i < 6; i++) { For(int j = 1; j <= 5; j++) { System.out.print(I + j + " "); } System.out.println(); }
What is printed by the third iteration of the outer loop? Answer: 3 4 5 6 7 ⩥ int x=1; while(x <=5) { x++; System.out.print(x); } What is the output of the code above? Answer: 2 3 4 5 6 ⩥ int z = 2. sum = 0; while (z < 9) { z++; sum = sum + z; } System.out.print(sum); What is the output of the code above? Answer: 42 ⩥ int b =0, sum =0; while (b < 6) { ++b; if(b % 2 == 0)
⩥ public static void main(String[] args) { System.out.print("W"; p(); System.out.print("Z"); } public static void p() { System.out.print("X"); System.out.print("Y"); } What is the output of the code above? Answer: WXYZ ⩥ Public static double area(double radius){ ... In the method header above, radius is called a ? Answer: Formal parameter ⩥ 6. int length = 5, width = 8;
- area(length, width); As used in line 7, length and width are called the ? of the area method? Answer: Arguments ⩥ To be capable of being called in the main method of a Java program, a method defined in the same class must have the ? modifier? Answer: Static
⩥ public static void main(String[] args) { int number = 10; doubleNum(number); System.out.println(number); } public static void doubleNum(int n) { System.out.println(n * 2); } For the program above what will be the value displayed to the system console in the highlighted text? Answer: 10 ⩥ public static void main(String[] args) { ArrayList langs = new ArrayList(); lands.add("Java"); lands.add("C++"); lands.add("Python"); lands.add("2,null"); lands.add("2,null"); lands.add("4, "PHP"); for(int i = 0, i < langs.size(); i ++ ) {
d. Once created, an array cannot be re-sized. ⩥ Identify the statements that will NOT compile. Select ALL that apply. Answer: a. ArrayList[String] stock = new ArrayListString; b. ArrayList charas = new ArrayList(); c. Int[4] items = {5,9,11,8} ⩥ 6. ArrayList counts = new ArrayList<>();
- counts.add(10);
- counts.add(new Integer(8)); Identify the true statement regarding the code above. Answer: No errors, code compiles okay. ⩥ Identify the true statements. Select ALL that apply. Answer: a. Constructors are called with the new operator. b. Constructors can be overloaded. c. Constructors must have the same name as the class. ⩥ Identify the true statements. Select ALL that apply. Answer: a. A static method cannot access the data members of its own class. b. Static methods are also called class methods. c. Static methods of a class can be called without instantiating the class.
⩥ Identify the true statements. Select ALL that apply. Answer: a. Anonymous objects are possible in Java. b. Constants in a class should be declared as final static. c. Static variable and static methods of a class can be accessed by an object of that class and by the class name. ⩥ public class Person { private String name; ... What term(s) describe(s) name in the snippet above? Select ALL that apply. Answer: a. Instance variable b. Field c. Data member d. Attribute ⩥ What does the public visibility modifier mean? Answer: Means accessible from any other classes. ⩥ Identify the true statements. Select ALL that apply. Answer: a. A getter method has the same return-type as the field it retrieves and takes no parameters. b. A setter method is a return-type void and takes a parameter of the same type as its field. c. Setters and getters are not required for public instance variables.
⩥ ? is a binary relationship between two different classes. Answer: Association ⩥ An aggregating object exclusively own another object. This is ? Answer: Composition ⩥ Identify the statement(s) that compile without error(s). Select ALL that apply. Answer: a. Integer num = 10; b. Integer num = new Integer(10); c. Integer num = new Integer("10"); ⩥ Which of the following correctly assign the string hello to a String? Answer: a. StringBuilder = str = new StringBuiler("hello"); String stt = str.toString(); b. String st = new String("hello"); c. String st = "hello"; d. char[] hello = {'h','e','l','l','o'}; String st = new String(hello); ⩥ 3. public class Person {
public Person() {
} What type of constructor is illustrated by lines 5 through 7? Answer: No- arg ⩥ Data fields are encapsulated with which modifier? Answer: Private ⩥ What Java keyword sometimes used in a class definition refers to the class itself? Answer: This ⩥ String str2 = "b$h&".replaceAll("@&$","oo"); System.out.println(str2.replaceAll("[@&$]","oo")); What is printed? Answer: boohoo ⩥ StringBuilder sb = new StringBuilder(); sb.append("Hey Java"); System.out.println(sb.capacity() - sb.length()); Answer: 8 ⩥ What is called by the throw statement? Answer: A catch block. ⩥ Identify the true statements. Select ALL that apply. Answer: a. Class Throwable is the parent class for all exceptions.
