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2 years ago

To use an ArrayList in your program, you must import:1. the java.collections package

Computers and Technology

1 answer:

Rom4ik [11]2 years ago

5 0

Answer:

Option 4: the java.util package

Explanation:

ArrayList is one of the Java collections that offer some handy features to manipulate a list of elements. ArrayList is not available in a Java program by default without explicitly import it. To use ArrayList, we need to write an import statement as follows:

import java.util.ArrayList;

After that, we can only proceed to declare an ArrayList in our Java program. For example:

ArrayList<String> studentNames = new ArrayList<String>();

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2 years ago

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2 years ago

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Arte-miy333 [17]

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g Create your own data file consisting of integer, double or String values. Create your own unique Java application to read all

Jlenok [28]

Answer:

See explaination

Explanation:

//ReadFile.java

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

public class ReadFile

{

public static void main(String[] args)

{

int elementsCount=0;

//Create a File class object

File file=null;

Scanner fileScanner=null;

String fileName="sample.txt";

try

{

//Create an instance of File class

file=new File(fileName);

//create a scanner class object

fileScanner=new Scanner(file);

//read file elements until end of file

while (fileScanner.hasNext())

{

double value=fileScanner.nextInt();

elementsCount++;

}

//print smallest value

System.out.println(elementsCount+" data values are read");

}

//Catch the exception if file not found

catch (FileNotFoundException e)

{

System.out.println("File Not Found");

}

Sample output:

sample.txt

output:

5 data values are read

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2 years ago