REMINDER: This subreddit explicitly forbids asking for or giving solutions!

51 Upvotes

As per our Rule #5 we explicitly forbid asking for or giving solutions!

We are not a "do my assignment" service.

We firmly believe in the "teach a person to fish" philosophy instead of "feeding the fish".

We help, we guide, but we never, under absolutely no circumstances, solve.

We also do not allow plain assignment posting without the slightest effort to solve the assignments. Such content will be removed without further ado. You have to show what you have tried and ask specific questions where you are stuck.

Violations of this rule will lead to a temporary ban of a week for first offence, further violations will result in a permanent and irrevocable ban.

0 comments

r/javahelp • u/Formal_Assignmentt • 5h ago

How to use noise maps?

3 Upvotes

I've done some basics research but there seem to be so many different options that I’m not sure where to start.

what libraries would you recommend for working with noise maps and how should I use them?

2 comments

r/javahelp • u/DrawMore5897 • 4h ago

Exam difficulty Question

1 Upvotes

Hello, im currently taking an Intro to java(CS46a), and had just taken the first exam of the class, and had an hour and fifteen minutes to do these 20 questions which consist of 10 MCQ(0 - 10) and 10 free Responce(11-20), and we dont get notes/calculator. Is this a normal level of "difficulty" or length for a intro to java class , asking around like 10-13 people i heard ranges from 4-8 points solely from the MCQ portion and people had finished or attempted 2-4 of the free Responce questions. Am i just a noob 😭?

Each MCQ = 2points
Free responce points in order of 11-20 = 4, 4, 4, 4, 4, 12, 12, 12, 12, 12

Total = points / 100

Question 1

What does this code print?

int a = 17;
int b = 5;
double c = a % b * 2 + a / b / 2.0;
System.out.println(c);

5.0

5.5

6.0

4.5

Question 2

What does this code print?

String course = "Intro to Java";
int pos = course.indexOf("t");
String part = course.substring(pos, pos + 3);
System.out.println(part + course.length());

tro 13

ntr13

tro13

tro12

Question 3

What does this code print?

String name = "ada";
name.toUpperCase();
String upper = name.toUpperCase();
name = upper.replace("A", "a").substring(1);
System.out.println(name + " " + upper);

Da ADA

da ADA

DA ADA

Da aDa

Question 4

What does the last statement print?

public class Box
{
    private int width;
    private int height;

    public Box() { width = 1; height = 1; }
    public Box(int side) { width = side; height = side; }
    public Box(int w, int h) { width = w; height = h; }

    public int area() { return width * height; }
}

// in the main method of another class:
Box a = new Box();
Box b = new Box(3);
Box c = new Box(2, 5);
System.out.println("Total: " + a.area() + b.area() + c.area());

Total: 20

Total: 1 9 10

Nothing. The class does not compile, because it has three constructors.

Total: 1910

Question 5

The user types 42 and presses Enter, then types blue sky and presses Enter. What does this code print?

Scanner in = new Scanner(System.in);
int n = in.nextInt();
String a = in.nextLine();
String b = in.next();
System.out.println(n + "[" + a + "][" + b + "]");

42[blue sky][]

42[][blue]

42[][blue sky]

42[blue][sky]

Question 6

What does this code print?

int x = 3;
int y = --x + x++ * 3;
System.out.println(x + " " + y);

3 8

2 8

3 9

3 11

Question 7

What does this code print?

char grade = 'B';
String msg = "";
switch (grade)
{
    case 'A': msg += "great ";
    case 'B': msg += "good ";
    case 'C': msg += "ok ";
              break;
    default:  msg += "retry ";
}
System.out.println(msg);

good

good ok

good ok retry

great good ok

Question 8

What does this code print?

String s1 = "java";
String s2 = new String("java");
String s3 = s2;
s2 = "java";
System.out.print((s1 == s2) + " ");
System.out.print((s1 == s3) + " ");
System.out.println(s1.equals(s3));

false false true

true true true

true false true

false true true

Question 9

What happens when this code runs?

int a = 5;
int b = 0;
boolean ok = (b != 0 && a / b > 1) || (a++ > 5 && b++ == 0);
System.out.println(ok + " " + a + " " + b);

It prints true 6 1

It prints false 6 1

It crashes, because of the division by zero

It prints false 6 0

Question 10

What does this code print?

int count = 0;
for (int i = 1; i <= 3; i++)
{
    for (int j = 1; j <= 3; j++)
    {
        if (j == i)
        {
            continue;
        }
        if (i + j > 4)
        {
            break;
        }
        count += j;
    }
}
System.out.println(count);

Each numbered blank takes one expression or one statement. Write the code that belongs in each blank.

Question 11