public static void main(String[] args) {
Person p1 = new Person("John");
Person p2 = new Person("Mary");
p1.setFriend(p2);
p1.age = 20;
p2.age = 18;
System.out.println(p1.getInfo());
System.out.println(p2.getInfo());
}
}
如何使输出为John Friend:Mary
Mary Friend:John
ziom
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