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ArrayList<Integer> list = new ArrayList<>();
list.add(1);
list.add(2);
list.add(3);
list.add(4);
list.add(5);

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5

for (int i=0;i< list.size();i++){
System.out.println(list.get(i));
}

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5

for (Integer integer : list) {
System.out.println(integer);
}

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Iterator<Integer> iterator = list.iterator();
while (iterator.hasNext()){
System.out.println(iterator.next());
}

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@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {
private String name;
private String gender;
}

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List<Student> students = new ArrayList<>();
students.add(new Student("张三","男"));
students.add(new Student("李四","女"));
students.add(new Student("王五","女"));
students.add(new Student("小六","男"));

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for (int i = 0; i < students.size(); i++) {
if (students.get(i).getGender().equals("女")){
students.remove(i);
}
}

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[Student(name=张三, gender=男),
Student(name=王五, gender=女),
Student(name=小六, gender=男)]

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for (Student student : students) {
if (student.getGender().equals("女")) {
students.remove(student);
}
}

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Iterator<Student> iterator = students.iterator();
while (iterator.hasNext()){
if (iterator.next().getGender().equals("女")){
iterator.remove();
}
}

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[Student(name=张三, gender=男), Student(name=小六, gender=男)]