Java中方法参数传递是：值传递(Pass By Value)
public class ParameterDemo{
public void changeValue1(int a){
a = 8;
}
public void changeValue2(Employee e){
e.salary = 8000;
}
public void changeValue3(Employee e){
e = new Employee();
e.salary = 8000;
}
public void swap(Employee e, Employee e2){
Employee temp = e;
e = e2;
e2 = temp;
}
public static void main(String[] args){
MethodDemo m = new MethodDemo();
int a = 10;
System.out.println(a);//10
m.changeValue1(a);
System.out.println(a);//10
Employee e = new Employee();
System.out.println(e.salary);//0
m.changeValue2(e);
System.out.println(e.salary);//8000
Employee e2 = new Employee();
System.out.println(e2.salary);//0
m.changeValue3(e2);
System.out.println(e2.salary);//0
Employee e3 = new Employee();
e3.name = "huhu";
Employee e4 = new Employee();
e4.name = "hengheng";
System.out.println("e3.name = "+e3.name+" e4.name = "+ e4.name);//e3.name = huhu e4.name = hengheng
m.swap(e3, e4);
System.out.println("e3.name = "+e3.name+" e4.name = "+ e4.name);//e3.name = huhu e4.name = hengheng
}
}
class Employee{
String name;
int salary;
}