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1. For loop statement

The first method is the well-known for loop statement:

Intl = students.size (); System.out.println ("Student Information:"); for (int I = 0; I < l; iTunes +) {Student s = (Student) students.get (I) System.out.println ("serial number:" + s.ID + "\ t\ t\ t name:" + s.name + "\ t\ t\ t age:" + s.age + "\ t\ t gender:" + s.gender);}} 2, foreach statement

The foreach statement is one of the new features of the Java5 version, which provides programmers with great convenience when it is designed to traverse arrays and collections, but the foreach statement cannot completely replace the for loop statement.

System.out.println ("(foreach) student information:"); for (Object obj:students) {Student s = (Student) obj; System.out.println ("No.:" + s.ID + "\ t\ t\ t name:" + s.name + "\ t\ t\ t Age:" + s.age + "\ t\ t gender:" + s.gender);}}

From a code point of view, the foreach statement is obviously much simpler than the for loop statement, without the need to define initial values, determine the scope of judgment, and do not need to increase or decrease. But this does not mean that foreach statements can replace for loop statements. Obviously, what foreach can do, for loops can do; what for loops can do, foreach can not necessarily do.

3. Iterable interface

Iterate through the elements in the collection through the iterator Iterable:

System.out.println ("(iterator) student information:"); Iterator it=students.iterator (); while (it.hasNext ()) {Student s = (Student) it.next (); System.out.println ("No.:" + s.ID + "\ t\ t\ t name:" + s.name + "\ t\ t\ t Age:" + s.age + "\ t\ t gender:" + s.gender) }

The iterator is used to traverse the elements in the collection, which itself does not have the storage capacity and is dependent on the collection.

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