Thread: ArrayList

ArrayList cannot be resolved to a type IS THE ERROR THAT I'M GETTING


import java.util.List;
import java.util.Scanner;

public class Second {

public static void main(String[] args) {
// TODO Auto-generated method stub
int n;
int status = 1;
int num = 3;
//object of the ArrayList class
List<Integer>primelist = new ArrayList<Integer>();
//object of the Scanner class
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the value of n: ");
//reading the value of n from the user
n = scanner.nextInt();

if(n>=1 ) {
System.out.println("First "+n+" prime number are: ");
//2 is a known prime number
System.out.println(2);
//adding 2 in the ArrayList
primelist.add(2);
}
for(int i=2;i<=n {
for(int j=2;j<Math.sqrt(num);j++) {
if(num%j==0) {
status=0;
break;
}
}
if(status!=0) {
System.out.println(num);
//adding numbers to the ArrayList
primelist.add(num);
i++;
}
status=1;
num++;
}
System.out.println("Alternate prime numbers are: ");
//loop for printing the alternate prime numbers
for(int k=0;k<primelist.size();k++) {
if((k%2)==0)
System.out.println(" "+primelist.get(k));
}

}

}

Originally Posted by Norm

The compiler can not find a declaration for the ArrayList class using the import statements. Check what package it is in and make sure there is an import statement for it.

Please edit your post and wrap your code with code tags:

[code]
**YOUR CODE GOES HERE**
[/code]

to get highlighting and preserve formatting.

Thanks

import java.util.List;
import java.util.Arrays;
import java.util.Collections;

public class ThirdLargestInArrayExample2 {
public static int getThirdLargest(Integer [] a,int total) {
List<Integer> list = Arrays.asList(a);
Collections.sort(list);
int element=list.get(total-3);
return element;
}

public static void main(String[] args) {
// TODO Auto-generated method stub
Integer a[] = {1,2,5,6,3,2};
Integer b[] = {44,66,99,77,33,22,55};
System.out.println("ThirdLargest: "+getThirdLargest(a,6));
System.out.println("Third Largest: "+getThirdLargest(b,7));

}

}
GETTING AN ERROR ON LINE 7

import java.util.List;
import java.util.Arrays;
import java.util.Collections;
 
public class ThirdLargestInArrayExample2 {
	public static int getThirdLargest(Integer [] a,int total) {
		List<Integer> list = Arrays.asList(a);
		Collections.sort(list);
		int element=list.get(total-3);
		return element;
	}
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
			Integer a[] = {1,2,5,6,3,2};
			Integer b[] = {44,66,99,77,33,22,55};
			System.out.println("ThirdLargest: "+getThirdLargest(a,6));
			System.out.println("Third Largest: "+getThirdLargest(b,7));
 
	}
 
}

--- Update ---

It's working fine now

import java.util.Scanner;
 
public class Main {
	private static void Generator (int numberofchars, String password) {
		Scanner input = new Scanner(System.in);
		System.out.print("How many characters do you want in your password: Pick a number betwwen 4 and 64 ");
		numberofchars = input.nextInt();
		input.close();
		if ((numberofchars >= 4) && (numberofchars <=8)) {
			System.out.println("I suggest you have a password greater than 8 characters");
		}
		if ((numberofchars < 4) || (numberofchars > 64)) {
			System.out.println("Your password must greater than 3 characters and less than 65 characters");
		}
	}
 
	public static void main(String[] args) {
		/* November 25, 2022
		 * Generates a password between 4 and 64 characters
		 */
		char alpha [] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
		int num [] = {0,1,2,3,4,5,6,7,8,9};
		char special [] = {'.','?','!',',',':',';','-','[',']','{','}','(',')','"'};
		Generator();
 
	}
 
}

--- Update ---

GETTING ERROR ON Generator();