Display items in ArrayList only over a specific number in Java-CodePudding

I am working on a program that has to display only the items in an ArrayList whose value is greater than 10. I am using the toString() method to display the items, but I want to display only the items that have a value greater than 10. Any help would be greatly appreciated.

CodePudding user response：

You can use for loop with if condition to integer greater than 10 in an ArrayList

import java.util.*;
    
    public class MyArrayList {
        public static void main(String args[]) {
    
            // Creating and initializing the ArrayList
            // Declaring object of integer type
            List<Integer> randomNumbers = Arrays.asList(1, 12, 33, 4, 25, 6, 17, 98);
    
            // Iterating using for loop
            for (int i = 0; i<randomNumbers.size(); i  ) {
                if (randomNumbers.get(i) > 10) {
                    // Printing and display the elements over 10
                    System.out.print(randomNumbers.get(i)   " ");
                }
            }
        }
    }

CodePudding user response：

What type is the ArrayList? Is it already of type ArrayList<Integer>?

In Java, an enhanced for-loop is a quite efficient way to read through the ArrayList:

for(single datatype : group of datatypes)

If numberList is type ArrayList<Integer> : for(Integer number : numberList)
If list is a non-typed ArrayList: for(Object obj : list)

Then in that loop, you can use the > (greater than) operator to test the value of each number read. As shown in @Sumit Sharma's example:

if (randomNumbers.get(i) > 10) -- Note: this is the syntax for a regular, not the enhanced for-loop

EDIT FOR ADDITIONAL INFORMATION

This is what the enhanced for-loop translated into the style of a regular for-loop

for(int index = 0; index < (size of the datatype group); index  )

It is class Array List with 2 items in it that of name and the number -- @Grenard

Depending on which index it is, you can perform a test like this:

/* 
With the regular for-loop: 
get the whole ArrayList entry and read the Integer value
*/
Object testObject = groupOfDatatypes.get("the for-loop index");
Integer testInt = testObject.get("the object's integer index");

/*
With the enhanced for-loop: 
it already knows its index, use that to read the Integer value
*/
Integer testInt = datatype.get("the object's integer index");

Note: This is pseudo-code to the max