Java中的foreach遍历 

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List<Person> persons = new ArrayList<Person>();
persons.add(new Person("name1", 11));
persons.add(new Person("name2", 12));
persons.add(new Person("name3", 13));

for (Person person : persons) {
	person.setAge(person.getAge()+5);
}

for (Person person : persons) {
	System.out.println(person);
	System.out.println(person == persons.get(0));
}


Person [name=name1, age=16]
true
Person [name=name2, age=17]
false
Person [name=name3, age=18]
false

对于在for遍历中的每个person对象,其实是persons中的一个对象,如果改变person的值,也就造成了persons中对象的改变.