Java: How to find Longest String in ArrayList ? [FUNCTION]

While I was playing with Java code, I have coded a class that has method that finds longest String in the ArrayList. Method is very simple, but I am sure that some of you will find it useful.

So here it is:

 // I have a class attribute:
private ArrayList wordsList = new ArrayList();

// here is method itself:
public String longest_word(){
	String longest_word="";
	int maxLength=0;
		for(int i=0; i

			if(wordsList.get(i).length() > maxLength){
			  maxLength = wordsList.get(i).length();
			  longest_word = wordsList.get(i);
	return longest_word;

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Anatoly Spektor

IT Consultant with 6 years experience in Software Development and IT Leadership. Participated in such projects as Eclipse IDE, Big Blue Button, Toronto 2015 Panam Games.

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  1. jetcracker

    It’s better to use iterators for this type of work. Because if your array is a LinkedList instance, using get(i) will have a negative effect on performance.

  2. jetcracker

    If you are using JDK 6 – you can use short for-statement:
    [sourcecode language=”java”]
    for(String w: wordList) {
    if( w.length() > maxLength ) maxLength = w.length();

    1. A

      this works too

      public int maxLength(ArrayListlist){
      int max=0;
      for(int i=0; i<=list.size()-1; i++){

      return max;