Six different ways to iterate list in java

java Collections interview Questions

How many ways we can iterate list in java?

• We can iterate list in 6  different ways in java.

1. For Loop
2. Enhanced For Loop
3. While Loop
4. Iterator
5. Collections stream() util (Java8 feature)
6. ListIterator

1. Iterate list using For loop

1.Basic Java example program to iterate arraylist elements using list iterator

1. package com.javaIteratelist;
2.  
3. import java.util.ArrayList;
4. import java.util.Collections;
5. import java.util.Iterator;
6.  
7. public class IterateList{
8.  
9. public static void main(String[] args) {
10.   
11. //create an ArrayList object
12.  List<String> instanceofjavaList = new ArrayList<String>();
13.        
14. //Add elements to Arraylist
15.  
16. // add 5 different values to arraylist 
17. instanceofjavaList.add("Interview Questions");
18. instanceofjavaList.add("Interview Programs");
19. instanceofjavaList.add("Concept and example program");
20. instanceofjavaList.add("Concept and interview questions");
21. instanceofjavaList.add("Java Quiz");
22.     
23. for (int i = 0; i < instanceofjavaList.size(); i++) {
24.  
25.     System.out.println(instanceofjavaList.get(i));
26.  
27. }
28. 
    
29. }
30.  
31. }
     

Output:

1. Interview Questions
2. Interview Programs
3. Concept and example program
4. Concept and interview questions
5. Java Quiz

 2. Iterate list using Enhanced For loop

1. package com.javaIteratelist;
2.  
3. import java.util.ArrayList;
4. import java.util.Iterator;
5.  
6. public class IterateList{
7.  
8. public static void main(String[] args) {
9.   
10. //create an ArrayList object
11. List<String> instanceofjavaList = new ArrayList<String>();
12.        
13. //Add elements to Arraylist
14.  
15. // add 5 different values to arraylist 
16. instanceofjavaList.add("Interview Questions");
17. instanceofjavaList.add("Interview Programs");
18. instanceofjavaList.add("Concept and example program");
19. instanceofjavaList.add("Concept and interview questions");
20. instanceofjavaList.add("Java Quiz");
21.  
22. for (String str: instanceofjavaList) {
23.             System.out.println(str);
24. }
25. 
    
26. }
27.  
28. }
     

Output:

1. Interview Questions
2. Interview Programs
3. Concept and example program
4. Concept and interview questions
5. Java Quiz

 3. Iterate list using while loop

1. package com.javaIteratelist;
2.  
3. import java.util.ArrayList;
4. import java.util.Iterator;
5.  
6. public class IterateList{
7.  
8. public static void main(String[] args) {
9.   
10. //create an ArrayList object
11. List<String> instanceofjavaList = new ArrayList<String>();
12.        
13. //Add elements to Arraylist
14.  
15. // add 5 different values to arraylist 
16. instanceofjavaList.add("Interview Questions");
17. instanceofjavaList.add("Interview Programs");
18. instanceofjavaList.add("Concept and example program");
19. instanceofjavaList.add("Concept and interview questions");
20. instanceofjavaList.add("Java Quiz");
21.  
22.  
23. int i = 0;
24.  
25. while (i < instanceofjavaList.size()) {
26.  
27.   System.out.println(instanceofjavaList.get(i));
28.   i++;
29. }
30. 
    
31. }
32.  
33. }
     

Output:

1. Interview Questions
2. Interview Programs
3. Concept and example program
4. Concept and interview questions
5. Java Quiz

 4. Iterate list using iterator

1. package com.javaIteratelist;
2.  
3. import java.util.ArrayList;
4. import java.util.Iterator;
5.  
6. public class IterateList{
7.  
8. public static void main(String[] args) {
9.   
10. //create an ArrayList object
11. List<String> instanceofjavaList = new ArrayList<String>();
12.        
13. //Add elements to Arraylist
14.  
15. // add 5 different values to arraylist 
16. instanceofjavaList.add("Interview Questions");
17. instanceofjavaList.add("Interview Programs");
18. instanceofjavaList.add("Concept and example program");
19. instanceofjavaList.add("Concept and interview questions");
20. instanceofjavaList.add("Java Quiz");
21.  
22.  
23. Iterator<String> itr = instanceofjavaList.iterator();
24.  
25. while (itr.hasNext()) {
26.      System.out.println(itr.next());
27. }
28.  
29. }
30.  
31. }
     

Output:

1. Interview Questions
2. Interview Programs
3. Concept and example program
4. Concept and interview questions
5. Java Quiz

 5. Iterate list using Stream API.

1. package com.javaIteratelist;
2.  
3. import java.util.ArrayList;
4. public class IterateList{
5.  
6. public static void main(String[] args) {
7.   
8. //create an ArrayList object
9. List<String> instanceofjavaList = new ArrayList<String>();
10.        
11. //Add elements to Arraylist
12.  
13. // add 5 different values to arraylist 
14. instanceofjavaList.add("Interview Questions");
15. instanceofjavaList.add("Interview Programs");
16. instanceofjavaList.add("Concept and example program");
17. instanceofjavaList.add("Concept and interview questions");
18. instanceofjavaList.add("Java Quiz");
19.  
20.  
21. instanceofjavaList.forEach((name) -> {
22.             System.out.println(name);
23.         }); 
24. 
    
25. }
26.  
27. }
     

Output:

1. Interview Questions
2. Interview Programs
3. Concept and example program
4. Concept and interview questions
5. Java Quiz

6. Using List erator:

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Six different ways to iterate list in java

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