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Java experts, HELP

Anonymous Sat 20 Feb 2021 04:29:02 No.976912 View View Reply Original Report

I've missed the latest lecture(due to hospital appointment) and the teacher set his homework right after it finished. I told him to record the lecture(it's online) because I might not come in time(I've never missed his lectures for 8 months - he teached me 2 courses-) but he marked me as absent and didn't record at all. Idk anything except the UML, stack, push,pop, what do all of these do? I can remove the non-alphanumeric but I don't how to dp this for nonaplhabetic..
What does stack in Q1, point3 is referred to ?
Can anyone help me to do it with explanation?
Im so fucking overwhelmed, the chapters provided didn't at all have similar problems, only explaining concepts ):
Any advice would help, thank you

Anonymous

View Same Google ImgOps iqdb SauceNAO javaoutput.png, 3KiB, 674x24

Anonymous Sat 20 Feb 2021 04:29:29 No.976914 Report

Quoted By:

Output should look like this

Anonymous

Anonymous Sat 20 Feb 2021 07:26:56 No.976979 Report

Quoted By:

Bump

Anonymous

Anonymous Sat 20 Feb 2021 08:17:12 No.976986 Report

Quoted By: >>977115

>>976912
OP, this is all week two stuff.
Start at the start, try to do each bullet point in turn, and show us what you've got.

Anonymous

Anonymous Sat 20 Feb 2021 15:38:18 No.977115 Report

Quoted By: >>977116 >>977118

>>976986
I can't, I tried, but my code is mere mess. I'm just retarded I think

Anonymous

Anonymous Sat 20 Feb 2021 15:43:05 No.977116 Report

Quoted By: >>977120 >>977148

>>976912
>>977115
I mean at least do 1:1-1:4, and stubs for 1:5 and 1:6. It's literally just transcribing the problem statement.

Anonymous

Anonymous Sat 20 Feb 2021 15:44:14 No.977118 Report

Quoted By: >>977124 >>977148

>>976912
>>977115
And with the class at least having the correct signature, you should be able to do all of section three.

Anonymous

Anonymous Sat 20 Feb 2021 15:46:29 No.977120 Report

Quoted By:

>>977116
I'll show u what I did, plz wait

Anonymous

Anonymous Sat 20 Feb 2021 15:57:05 No.977124 Report

Quoted By: >>977126 >>977184

>>977118
Q1 Class StackOFPalindromes
package teststackofpalindromes;

public class StackOfPalindromes {

String words[];
int size;
final int DEFAULT_CAPACITY = 5;

public StackOfPalindromes() {
this(5);

}

public StackOfPalindromes(int capacity) {
size = capacity;
}

public String pop() {
return words[--size];
}

public String push(String value) {
StringBuilder stringBuilder = new StringBuilder();

// Examine each char in the string to skip alphanumeric char
for (int i = 0; i < value.length(); i++) {
if (Character.isLetterOrDigit(value.charAt(i))) {
stringBuilder.append(value.charAt(i));
}
}
if (size >= words.length) {
String[] temp = new String[words.length * 2];
System.arraycopy(words, 0, temp, 0, words.length);
words = temp;
}
words[size++] = value;
return value;

}

}
__________________
Q3 TestClassOfPalindromes

package teststackofpalindromes;
import java.util.Scanner;
public class TestStackOfPalindromes {

public static void main(String[] args) {
StackOfPalindromes object = new StackOfPalindromes();
object.push("Anna");
object.push("Civic2021");
object.push("Computer");
object.push("Mad?am");
object.push("Level5");
object.push("M-am");
object.push("Java");

System.out.print(object.pop());
}

}

Anonymous

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Anonymous Sat 20 Feb 2021 15:58:33 No.977126 Report

Quoted By:

>>977124
what do I do from here?

Anonymous

Anonymous Sat 20 Feb 2021 16:27:43 No.977136 Report

Quoted By:

bump

Anonymous

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Anonymous Sat 20 Feb 2021 16:46:52 No.977141 Report

Quoted By:

Bump

Anonymous

Anonymous Sat 20 Feb 2021 17:06:16 No.977148 Report

Quoted By: >>977184

>>977116
>>977118
w-where are you??

Anonymous

Anonymous Sat 20 Feb 2021 18:45:40 No.977184 Report

Quoted By: >>977187

>>977124
Okay, from what you've got:

>final int DEFAULT_CAPACITY = 5;
you need to actually use this in your default contstructor:
>public StackOfPalindromes() {
>this(DEFAULT_CAPACITY);

>public String pop() {return words[--size];}
You need a separate int to keep track of how many items you're storing: there's two different things here:
- the amount of things you're storing
- the maximum amount of things you can store (the capacity)
Looking at the assignment, you're probably supposed to be using size for the number of items, so you'll need to add a
>private int capacity
and initialise capacity in your constructor

Once you have a capacity, you should probably enforce it in push(). Have you done exceptions yet? If so, you should probably check if the stack is full, then instead of adding the item throw an IllegalStateException

>What does stack in Q1, point3 is referred to ?
That's the thing you're building: a stack is a data structure where you can add an item, and you can remove items in the opposite order they were added, but you can't just look at or remove stuff in an arbitrary order. Think about putting a stack of cards on your desk, and you're allowed to put a card on top, but you're only allowed to look at or remove the top card.

>what do I do from here?
A lot of what you've done is good. You should:
- implement size and capacity as different variables
- use some functions to clean up push() a bit (this will help you as well as your readers)
void push(String s) { // push should be void: you don't need to return a string because you'd just be giving whatever's calling you its string back
s = removeNonAlphabeticCharacters(s);
if (!isPalindrome(s)) return;
if (size == capacity) throw new IllegalStateException("Stack full!");
words[++size] = s; }
- write isPalindrome(String s)
- put bounds checking on pop() so you can't make size negative

>>977148
Had a work call. Sorry.

Anonymous

Anonymous Sat 20 Feb 2021 18:48:41 No.977187 Report

Quoted By:

>>977184
Thank u so much

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