Tuesday, 17 July 2012

How To Loop ArrayList In Java



Four ways to loop ArrayList in Java:
For loop
For loop (Advance)
While loop
Iterator loop

package com.sanjeetpandey.core;
 
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
 
public class ArrayListLoopingExample {
 public static void main(String[] args) {
 
  List<String> list = new ArrayList<String>();
  list.add("Text 1");
  list.add("Text 2");
  list.add("Text 3");
 
  System.out.println("#1 normal for loop");
  for (int i = 0; i < list.size(); i++) {
   System.out.println(list.get(i));
  }
 
  System.out.println("#2 advance for loop");
  for (String temp : list) {
   System.out.println(temp);
  }
 
  System.out.println("#3 while loop");
  int j = 0;
  while (list.size() > j) {
   System.out.println(list.get(j));
   j++;
  }
 
  System.out.println("#4 iterator");
  Iterator<String> iterator = list.iterator();
  while (iterator.hasNext()) {
   System.out.println(iterator.next());
  }
 }
}

Output:

#1 normal for loop
Text 1
Text 2
Text 3
#2 advance for loop
Text 1
Text 2
Text 3
#3 while loop
Text 1
Text 2
Text 3
#4 iterator
Text 1
Text 2
Text 3

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