JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Write a program to remove duplicate entries from an array.


Description:

The easiest way to remove duplicate entries from the given array is, create TreeSet object and add array entries to the TreeSet. Since the set doesnot support duplicate entries, you will get only unique elements left with TreeSet.


Code:
package com.java2novice.treeset;

import java.util.Arrays;
import java.util.List;
import java.util.TreeSet;

public class MyArrayDuplicates {

	public static void main(String a[]){
		String[] strArr = {"one","two","three","four","four","five"};
		//convert string array to list
		List<String> tmpList = Arrays.asList(strArr);
		//create a treeset with the list, which eliminates duplicates
		TreeSet<String> unique = new TreeSet<String>(tmpList);
		System.out.println(unique);
	}
}

Output:
[five, four, one, three, two]
<< Previous Program | Next Program >>

List Of All TreeSet Sample Programs:

  1. Basic TreeSet Operations.
  2. How to create a TreeSet with a List?
  3. How to read objects from TreeSet using using Iterator?
  4. Write a program to remove duplicate entries from an array.
  5. Write a program to find duplicate value from an array.
  6. How to create a TreeSet with comparator?
  7. Create TreeSet with comparator by user define objects.
  8. How to sort a TreeSet with user defined objects?
  9. How to get subset from sorted set?
  10. How to get least value element from a set?
  11. How to get highest value element from a set?
  12. How to avoid duplicate user defined objects in TreeSet?
Knowledge Centre
Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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