1. 160 Exam 2 Prep

2. How would I initialize an integer array named iArray with 9 elements?
int iArray = new int [9];
int [] iArray = new int [9];
int [] iArray = int [9];
int iArray = 9; B

3. What does the console print based off the following code?
public class Practice { public static void main (String [] args){ String s = “Koala Bears”; for (int i = 0; i < s.length(); i+=2) System.out.print(s.charAt(i)); }
KaaBas

4. What would I call this method in the main method?
public class Practice {
public static doubleMyInt(int i) {
return i * 2; }
Practice prac = new Practice();
prac.doubleMyInt(9);
doubleMyInt(9);
doubleMyInt(); B

5. What would the method declaration (or header) be if I wanted a public, non-static method that takes a String as a parameter, it returns an integer. The method is called “toAscii”.
public non-static int toAscii (String s)
public String toAscii (int i)
public int toAscii (String s)
public non-static int toAscii (int i) C

6. What would the method declaration (or header) be if I wanted a public, static method that returns nothing, takes no parameters and is called “method1”.
public void method1 (void)
public static method1()
public method1()
public static void method1() D

7. What does the code print?
public class Practice { public static void main (String [] args){ int i = 0; iterator(i); System.out.println(i); } public static int iterator (int i) { return i++;

8. What does the code print?
import java.util.Arrays; public class Practice { public static void main (String [] args){ char [] s = {'a','b','c','d'}; change(s); System.out.println(Arrays.toString(s)); } public static void change(char [] s) { s[1] = ‘z’;
[a, z, c, d]

9. Which one of these would not go to the end of String s
Which one of these would not go to the end of String s? (Specify which ones cause errors and which ones are just incorrect (but they compile)?
for (int i = 0; i <= s.length(); i++)
for (int i = 0; i < s.length()+1; i++)
for (int i = 0; i < s.length(); i++)
for (int i = 0; i <= s.length() -1; i++)
for (int i = 0; i < s.length() -1; i ++)
A gives an error (goes one more)
B gives an error (goes one more)
C is correct
D is correct
E is incorrect only goes to the second to the last index

10. What would this print?
import java.lang.Math; public class Practice { public static void main (String [] args){ Practice prac = new Practice(); double myDouble = 2.0; prac.cubed(myDouble); } public double cubed (double d) { return Math.pow(d, 3);
Doesn’t print anything

11. Answers

12. B
KaaBas C D
[a, z, c, d]
A gives an error (goes one more)
B gives an error (goes one more)
C is correct
D is correct
E is incorrect only goes to the second to the last index
9. Doesn’t print anything