Java loops Examples

In this blog post, I am going to demonstrate all of Java’s loops. I am going to write loops that prints the sum of numbers in a List.

For Loop

private static int sumFor(List<Integer> numbers){
int sum = 0;
for(int i=0; i < numbers.size();i++){
sum += numbers.get(i);
}
return sum;
}

For Each Loop

private static int sumForEach(List<Integer> numbers){
int sum = 0;
for(int num:numbers){
sum += num;
}
return sum;
}

While Loop

private static int sumWhile(List<Integer> numbers){
int sum = 0;
int i = 0;
while (i < numbers.size()){
sum += numbers.get(i);
i++;
}
return sum;
}

Do While Loop

private static int sumDoWhile(List<Integer> numbers){
int sum = 0;
int i = 0;
do{
sum += numbers.get(i);
i++;
}while (i < numbers.size());
return sum;
}