标签:style blog http color java for ar 代码
1.通过Comparable实现排序
package Comparable;
import java.util.Arrays;
public class ComparableUser implements Comparable<ComparableUser>
{
private String id;
private int age;
public ComparableUser(String id, int age) {
this.id = id;
this.age = age;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public int compareTo(ComparableUser o) {
return this.age - o.getAge();
//return ((ComparableUser) o).getAge() - this.age;
}
/**
* 测试方法
*/
public static void main(String[] args) {
ComparableUser[] users = new ComparableUser[] {
new ComparableUser("u1001", 25),
new ComparableUser("u1002", 20),
new ComparableUser("u1003", 21) };
Arrays.sort(users);// 对对象进行排序
for (int i = 0; i < users.length; i++) {
ComparableUser user = users[i];
System.out.println(user.getId() + " " + user.getAge());
}
}
}
2.通过实现Comparator进行排序
package Comparable;
import java.util.Arrays;
import java.util.Comparator;
class User {
private String id;
private int age;
public User(String id, int age) {
this.id = id;
this.age = age;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}
public class UserComparator implements Comparator {
public int compare(Object arg0, Object arg1) {
return ((User) arg0).getAge() - ((User) arg1).getAge();
}
/**
* 测试方法
*/
public static void main(String[] args) {
User[] users = new User[] { new User("u1001", 25),
new User("u1002", 20), new User("u1003", 21) };
Arrays.sort(users, new UserComparator());
for (int i = 0; i < users.length; i++) {
User user = users[i];
System.out.println(user.getId() + " " + user.getAge());
}
}
}
Java中Comparable和Comparator实现对象比较,布布扣,bubuko.com
Java中Comparable和Comparator实现对象比较
标签:style blog http color java for ar 代码
原文地址:http://www.cnblogs.com/Free-Thinker/p/3883825.html