Several ways of looping traversal

1. Basic

for (int i = 0; i<=50;i++) {

Todo

}

This loop is suitable for situations where you need to manipulate elements within a list based on an index.

2. Advanced

list<string> list = new arraylist<string> ();

for (String str:list) {

Todo

}

This loop is suitable for iterating through every element of the list, especially the list that iterates through an entity object.

3. High-order

list<string> list = new arraylist<string> ();

for (iterator<string> it = List.iterator (); It.hasnext ();) {

Strign str= It.next ();

if (It.hasnext ()) {

Todo

}else{

Todo

}

}

This loop is used when the list structure needs to be changed, the equivalent of the operation of the list, the only implementation of adding and removing nodes of the loop

Several ways of looping traversal