Learn from the java-15.1 filling containers (1)-Using the collection constructor

In this section we will introduce the filling container.

Just like an array, Arrays.fill is a fill method, which is also found inside the container.

1.collections.ncopies

This method is to generate a certain type of object, and then we can put it into the container's constructor. Fill the container.

Examples:

Package Com.ray.ch15;import Java.util.arraylist;import Java.util.collections;import java.util.linkedlist;public Class Test {public static void main (string[] args) {arraylist<integer> list = new Arraylist<integer> (collecti Ons.ncopies (5,1)); for (int i = 0; i < list.size (); i++) {System.out.print (List.get (i) + "");} linkedlist<integer> LinkedList = new Linkedlist<integer> (Collections.ncopies (6, 2)); for (int i = 0; I < Lin Kedlist.size (); i++) {System.out.print (Linkedlist.get (i) + "");}}}

Output:

1 1 1 1 1 2 2 2 2 2 2

2.fill

The fill here is not to be confused by his name. Its role is to replace objects inside the container.

Package Com.ray.ch15;import Java.util.arraylist;import Java.util.collections;public class Test {public static void main (string[] args) {arraylist<integer> list = new Arraylist<integer> (collections.ncopies (5,1)); for (int i = 0; i < list.size ( ); i++) {System.out.print (List.get (i) + "");} System.out.println (); Collections.fill (list, 2), for (int i = 0; i < list.size (); i++) {System.out.print (List.get (i) + "");}}}

Output:

1 1 1) 1 1
2 2 2) 2 2

Summary: This section describes how to populate the container and describes the Fill method.

This chapter is here. Thank you.

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Learn from the java-15.1 filling containers (1)-Using the collection constructor