List

Java has provided generic support in List interface.

Syntax

List<T> list = new ArrayList<T>();

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.

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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<Integer> integerList = new ArrayList<Integer>();
  
  integerList.add(Integer.valueOf(10));
  integerList.add(Integer.valueOf(11));
  List<String> stringList = new ArrayList<String>();
  
  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<String> 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