Java参数传递方式

Everything in Java are passed-by value.

基本类型的传递方式

基本类型是值传递，传递的是值得copy, 对于方法内的任何改变，都不会反映到原始的变量中。

对象的传递方式

对象传递的是对象的内存地址
一个小例子,仔细体会下，就明白了：

public class Test {    class Dog {        private int age;        public Dog(int age) {            this.age = age;        }        public int getAge() {            return age;        }        public void setAge(int age) {            this.age = age;        }        @Override        public String toString() {            return "Dog [age=" + age + "]";        }    }    private Dog dog = new Dog(0);    public void chageAge(Dog dog) {        dog.setAge(100);        Dog dog2 = new Dog(10);        dog = dog2;    }    public static void main(String[] args) {        Test test = new Test();        System.out.println(test.dog);        test.chageAge(test.dog);        System.out.println(test.dog);    }}

输出结果：

Dog [age=0]Dog [age=100]