Java Use Pro

Remove all elements from Java Array List

import java.util.ArrayList;

public class RemoveAllElementsOfArrayListExample

{

public static void main(String[] args)

{

ArrayList arrayList = new ArrayList();

arrayList.add("1");

arrayList.add("2");

arrayList.add("3");

System.out.println("Size of ArrayList before removing elements : "

+ arrayList.size());

arrayList.clear();

System.out.println("Size of ArrayList after removing elements : "

+ arrayList.size());

   }

}

Remove an element from specified index of Java Array List

import java.util.ArrayList;

public class RemoveElementFromArrayListExample

{

 public static void main(String[] args)

{

ArrayList arrayList = new ArrayList();

arrayList.add("1");

arrayList.add("2");

arrayList.add("3");

Object obj = arrayList.remove(1);

System.out.println(obj + " is removed from ArrayList");     

System.out.println("ArrayList contains...");

for(int index=0; index < arrayList.size(); index++)

System.out.println(arrayList.get(index));

   }

}

Replace an element at specified index of Java Array List

import java.util.ArrayList;  

public class ReplaceElementAtSpecifiedIndexArrayListExample

 {

public static void main(String[] args)

{

ArrayList arrayList = new ArrayList();

arrayList.add("1");

arrayList.add("2");

arrayList.add("3");   

arrayList.set(1,"REPLACED ELEMENT"); System.out.println("ArrayList contains...");

for(int index=0; index < arrayList.size(); index++)

System.out.println(arrayList.get(index));

   }

}

Search an element of Java Array List

import java.util.ArrayList; 

public class SearchAnElementInArrayListExample

{

public static void main(String[] args)

{

ArrayList arrayList = new ArrayList();

arrayList.add("1");

arrayList.add("2");

arrayList.add("3");

arrayList.add("4");

arrayList.add("5");

arrayList.add("1");

arrayList.add("2");

boolean blnFound = arrayList.contains("2");

System.out.println("Does arrayList contain 2 ? " + blnFound);

int index = arrayList.indexOf("4");

if(index == -1)

System.out.println("ArrayList does not contain 4");

else

System.out.println("ArrayList contains 4 at index :" + index);

int lastIndex = arrayList.lastIndexOf("1");

if(lastIndex == -1)

System.out.println("ArrayList does not contain 1");

else

System.out.println("Last occurrence of 1 in ArrayList is at index :"

+ lastIndex);

       }  

}

Sort elements of Java Array List

import java.util.ArrayList;

import java.util.Collections;

public class SortJavaArrayListExample

{

public static void main(String[] args)

{

ArrayList arrayList = new ArrayList();

arrayList.add("1");

arrayList.add("3");

arrayList.add("5");

arrayList.add("2");

arrayList.add("4");

Collections.sort(arrayList);  

System.out.println("ArrayList elements after sorting in ascending order : ");

for(int i=0; i

System.out.println(arrayList.get(i));

   }

}