值传递与引用传递1

值传递

public class ValueDemo 

{
public static void main(String[] args) 
{
int x = 10;
method(x);
System.out..println("x="+x);
}
public static void method(int mx){
mx = 20;
}

}

引用传递

public class RefDemo1 
{
public static void main(String[] args) 
{
Cat c = new Cat();
method(c);
System.out.println("Cat age ="+c.age);


}
public static void method(Cat cat){
cat.age = 5;
}
}


class Cat{
int age = 2;
}