老师帮忙看一下我的代码有什么问题吗？
代码如下：
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
public class TreeMapCompare {
public static void main(String[] args) {
Map<User, String> map = new TreeMap<>();
User u1 = new User("Leo", 21);
User u2 = new User("Fish", 23);
User u3 = new User("Angela", 18);
User u4 = new User("Orange", 20);
map.put(u1, "Leo");
map.put(u2, "Fish");
map.put(u3, "Angela");
map.put(u4, "Orange");
Set<User> keys = map.keySet();
for(User key: keys) {
System.out.println(key + "---------" + map.get(key));
}
}
}User代码如下：
import java.util.Objects;
public class User implements Comparable<User> {
private String name;
private int age;
public User() {
}
public User(String name, int age) {
this.name = name;
this.age = 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;
}
@Override
public boolean equals(Object o) {
System.out.println("equals start");
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
User user = (User) o;
System.out.println("equals end");
return age == user.age &&
Objects.equals(name, user.name);
}
@Override
public int hashCode() {
return Objects.hash(name, age);
}
@Override
public String toString() {
return "User{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
@Override
public int compareTo(User o) {
if(this.getAge() > o.getAge()) {
return 1;
}
if(this.getAge() == o.getAge()) {
this.getName().compareTo(o.getName());
}
return -1;
}
}运行结果：
通过Key无法获取TreeMap中的Value值，请问一下老师，我的代码中存在什么问题吗？
京公网安备 11011402011233号