check list for empty and null java
/*
If you use the Apache Commons Collections library in your project,
you may use
*/
CollectionUtils.isEmpty(MyList) or MapUtils.isEmpty(MyList)
/*
which respectively check
if a collection or a map is empty or null
(i.e. they are "null-safe").
*/
/*
Small tip:
remember that the less code you write,
the less code you need to test as the complexity of your code decreases.
*/ArrayList isEmpty() method in java
import java.util.ArrayList;
public class ArrayListIsEmptyMethodExample
{
public static void main(String[] args)
{
ArrayList<Integer> al = new ArrayList<Integer>();
// before checking ArrayList using isEmpty() method
System.out.println("Is ArrayList empty: " + al.isEmpty());
al.add(86);
al.add(25);
al.add(53);
al.add(85);
// after checking ArrayList using isEmpty() method
System.out.println("Is ArrayList empty: " + al.isEmpty());
for(Integer num : al)
{
System.out.println(num);
}
}
}Copyright © 2021 Codeinu
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