JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Write a program to find duplicate value from an array.


Description:

The easiest way to find 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 can easily findout duplicate entries. Below example add each element to the set, and checks the returns status.


Code:
package com.java2novice.treeset;

import java.util.TreeSet;

public class MyDuplicateEntry {

	public static void main(String a[]){
		String[] strArr = {"one","two","three","four","four","five"};
		TreeSet<String> unique = new TreeSet<String>();
		for(String str:strArr){
			if(!unique.add(str)){
				System.out.println("Duplicate Entry is: "+str);
			}
		}
	}
}

Output:
Duplicate Entry is: four
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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
Difference between while and do-while
The while statement verifies the condition before entering into the loop to see whether the next loop iteration should occur or not. The do-while statement executes the first iteration without checking the condition, it verifies the condition after finishing each iteration. The do-while statement will always execute the body of a loop at least once.
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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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