The trimToSize() method is used to trim a ArrayList instance to the number of elements it contains.
Package: java.util
Java Platform : Java SE 8
Syntax:
trimToSize()
Return Value:
This method does not return any value.
Pictorial presentation of ArrayList.trimToSize() Method
Example: ArrayList.trimToSize() Method
The following example creates an ArrayList with a capacity of 50 elements. Four elements are then added to the ArrayList and the ArrayList is trimmed accordingly.
import java.util.*;
public class test {
public static void main(String args[]) {
// create an empty array list with capacity 50
ArrayList<Integer> myArray = new ArrayList<Integer>(50);
// Only add four elements to the ArrayList.
myArray.add(new Integer(10));
myArray.add(new Integer(22));
myArray.add(new Integer(30));
myArray.add(new Integer(40));
// Trim the ArrayList down to size.
myArray.trimToSize();
// Print all the elements available in list
for (Integer number : myArray) {
System.out.println("Number = " + number);
}
}
}
Output:
F:\java>javac test.java F:\java>java test Number = 10 Number = 22 Number = 30 Number = 40
Java Code Editor:
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