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class Person{
int age = 15;
public static void changeAge(Person p){
p.age = 10;
Person p1 = new Person();
p = p1;
System.out.println(p.age);
}
public static void main(String [] args){
Person p = new Person();
changeAge(p);
System.out.println(p.age);
}
}
class Person{
int age = 15;
public static void changeAge(Person p){
// p.age = 10;
Person p1 = new Person();
p = p1;
System.out.println(p.age);
}
public static void main(String [] args){
Person p = null;
changeAge(p);
System.out.println(p.age);
}
}
运行这个代码就明白了