1.值传递

    //值传递
    public static void main(String[] args) {
       int a = 999;
        dome d = new dome();
        d.chang(a);
        System.out.println(a);
    }
    public void chang(int a){
        a = 10;
    }

运行结果是：999

2.引用传递

public class dome2 {
    public static void main(String[] args) {
        //引用传递
        student student = new student();
        System.out.println(student.name);//打印结果为：null
?
        dome2 dome2 = new dome2();
        dome2.chang(student);
?
        System.out.println(student.name);//打印结果为：林勇琪
?
    }
    public void chang(student student){
        student.name = "林勇琪";
    }
}
class student{
    String name;
}