刚刚随便写了小段代码, 仅供参考。import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List;public class UserMgr { private List list = new ArrayList();
public void sort() { Collections.sort(list, new NameConparator()); }
public static void main(String args[]) { User u1 = new User("a", "d", 1);
User u2 = new User("c", "d", 1);
User u3 = new User("b", "d", 1);
UserMgr mgr = new UserMgr(); mgr.addUser(u1); mgr.addUser(u2); mgr.addUser(u3);
mgr.sort();
mgr.disp(); }
public void addUser(User u) { list.add(u); }
public void disp() { for(int i = 0; i < list.size(); i++) System.out.println(((User)list.get(i)).getName()); }
class NameConparator implements Comparator { public NameConparator() { super(); }
public boolean equals(Object obj) { return (super.equals(obj)); }
public final int compare(Object obj1, Object obj2) { int ret = 0; User u1 = (User)obj1; User u2 = (User)obj2; String name1 = u1.getName(); String name2 = u2.getName(); if(name1.compareTo(name2) >= 0) ret = 1; else ret = -1; return ret; } } } class User { private String name = null;
private String sex = null;
private int age = -1;
public User(String n, String s, int a) { setName(n); setSex(s); setAge(a); } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } }
仅供参考。import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;public class UserMgr {
private List list = new ArrayList();
public void sort()
{
Collections.sort(list, new NameConparator());
}
public static void main(String args[])
{
User u1 = new User("a", "d", 1);
User u2 = new User("c", "d", 1);
User u3 = new User("b", "d", 1);
UserMgr mgr = new UserMgr();
mgr.addUser(u1);
mgr.addUser(u2);
mgr.addUser(u3);
mgr.sort();
mgr.disp();
}
public void addUser(User u)
{
list.add(u);
}
public void disp()
{
for(int i = 0; i < list.size(); i++)
System.out.println(((User)list.get(i)).getName());
}
class NameConparator implements Comparator
{
public NameConparator()
{
super();
}
public boolean equals(Object obj)
{
return (super.equals(obj));
}
public final int compare(Object obj1, Object obj2)
{
int ret = 0;
User u1 = (User)obj1;
User u2 = (User)obj2;
String name1 = u1.getName();
String name2 = u2.getName();
if(name1.compareTo(name2) >= 0)
ret = 1;
else
ret = -1;
return ret;
}
}
}
class User
{
private String name = null;
private String sex = null;
private int age = -1;
public User(String n, String s, int a)
{
setName(n);
setSex(s);
setAge(a);
} public int getAge() {
return age;
} public void setAge(int age) {
this.age = age;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public String getSex() {
return sex;
} public void setSex(String sex) {
this.sex = sex;
}
}