How to iterate a List in Java
This tutorial shows several ways for iterating a List in Java.
1- Typical For loop
Using a typical For loop, you can iterate a List as the following:
1 2 3 4 5 6 7 | private static void iterateListForLoop(List<String> lstInput) { for(int i=0; i<lstInput.size(); i++) { System.out.println(lstInput.get(i)); } } |
2- Enhanced For loop
Since JDK 5.0, you can iterate a List using an enhanced For loop which works as the following:
1 2 3 4 5 6 7 | private static void iterateListForEach(List<String> lstInput) { for(String input : lstInput) { System.out.println(input); } } |
3- Typical While loop
Using a typical while loop, you can iterate a List as the following:
1 2 3 4 5 6 7 8 9 | private static void iterateListWhileLoop(List<String> lstInput) { int i=0; while(i<lstInput.size()) { System.out.println(lstInput.get(i)); i++; } } |
4- Iterator
Collections in Java can be iterated through Iterator as the following:
1 2 3 4 5 6 7 | private static void iterateListIterator(List<String> lstInput) { for(Iterator<String> iter = lstInput.iterator(); iter.hasNext();) { System.out.println(iter.next()); } } |
5- Java 8
With Java 8, you can iterate a List in one line using forEach() method as the following:
1 2 3 4 | private static void iterateListJava8(List<String> lstInput) { lstInput.forEach((name) -> System.out.println(name)); } |
