Type of list in Java

Java Generics - List

Java has provided generic support in List interface.

Syntax

List list = new ArrayList[];

Where

• list object of List interface.

• T The generic type parameter passed during list declaration.

Description

The T is a type parameter passed to the generic interface List and its implemenation class ArrayList.

Example

Create the following java program using any editor of your choice.

package com.tutorialspoint; import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class GenericsTester { public static void main[String[] args] { List integerList = new ArrayList[]; integerList.add[Integer.valueOf[10]]; integerList.add[Integer.valueOf[11]]; List stringList = new ArrayList[]; stringList.add["Hello World"]; stringList.add["Hi World"]; System.out.printf["Integer Value :%d\n", integerList.get[0]]; System.out.printf["String Value :%s\n", stringList.get[0]]; for[Integer data: integerList] { System.out.printf["Integer Value :%d\n", data]; } Iterator stringIterator = stringList.iterator[]; while[stringIterator.hasNext[]] { System.out.printf["String Value :%s\n", stringIterator.next[]]; } } }

This will produce the following result

Output

Integer Value :10 String Value :Hello World Integer Value :10 Integer Value :11 String Value :Hello World String Value :Hi World