Remove duplicate entries from ArrayList or List without using collection.
package testMavProject;
import java.util.ArrayList;
public class removeDuplicate {
public static void main(String[] args) {
// Create a ArrayList type of Integer or other datatype.
ArrayList<Integer> aList=new ArrayList<Integer>();
aList.add(5);
aList.add(7);
aList.add(5);
aList.add(6);
for(int i=0;i<aList.size();i++){
for(int j=i+1;j<aList.size();j++)
{
//Check for duplicate value using if condition
//If you are comparing Integer then you could use "==" sign; if you have string values then user equals method instead of ==.
if(aList.get(i)==(aList.get(j)))
{
//if values matched then remove the value from J index and back your J index to previous index J--
aList.remove(aList.get(j));
j--;
}
}
}
//Print your list without duplicate value.
System.out.println(aList);
}
}
