class Person{ ? ? ? //為什么系統提示我Person類已經定義，，什么意識 private String name; private int age; public Person(String name,int age){ this.setName(name); this.setAge(age); } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; }}public class Demo5_47 { public static void main(String[] args) { Person per=new Person("wuliehao",30); Person per1=new Person("zhangshan",30); if(per.getAge()==per1.getAge()&&per.getName().equals(per1.getName())){ System.out.println("兩個對象相等"); } else{ System.out.println("兩個對象不想等"); } }}