Syntax

Question 1

Static variable

Answer 1

private static int n;

Question 2

instance variable

Answer 2

private int n;

Question 3

Static method

Answer 3

public static int calc(int a, int b) {
return a + b * 2;
}

Question 4

Typecast

Answer 4

BankAccount myAccount = (BankAccount) anObject;

Question 5

Instanceof

Answer 5

if (anObject instanceof BankAccount)

Question 6

Wrapper

Answer 6

String input = “5”;
int in = Integer.parseInt(input);

Question 7

make a child class

Answer 7

public class Child extends Parent

Question 8

default constructor of a child class

Answer 8

super();

Question 9

abstract class

Answer 9

public abstract class Instructions {stuff}

Question 10

interface

Answer 10

public interface Moveable {

Question 11

implements

Answer 11

public class Warrior implements Moveable, Drawable {

Question 12

enum def

Answer 12

public enum FilingStatus {SINGLE,MARRIED};

Question 13

File IO

Answer 13

open:
FileReader reader = new FileReader(filename);
read: using scanner
Scanner data = new Scanner( reader ) ;
String line = data.nextLine() ;

Question 14

try catch

Answer 14

try {
FileReader reader = new FileReader(“input.txt”);
} catch (FileNotFoundException e) {
System.out.println(“File not found: input.txt”);
}

Question 15

throws

Answer 15

public void loadFile3() throws FileNotFoundException {
FileReader reader = new FileReader(“input.txt”);
}

Question 16

throw

Answer 16

if (bad stuff I detect)
throw new Exception(“blah”);

Question 17

public class Student {
protected String name;
private String address;
private int id ;
public boolean isEnrolled(int year) {
// do stuff
}
}
diagram?

Answer 17

Student
#name: String
-address: String
-id: int
—————-
+isEnrolled(year:int) : boolean

Question 18

public class GamePanel {
public static final int CELL_SIZE = 20;
private int whoseTurn;
public void drawBoard (Graphics g) { }
}

Answer 18

+CELL_SIZE: int = 20
-whoseTurn: int
—————–
+drawBoard(g:graphics)