package com.jckb;public class Name implements Comparable
     
      {    private String firstName;    private String lastName;        public Name(){}        public Name(String firstName, String lastName) {        super();        this.firstName = firstName;        this.lastName = lastName;    }        public String getFirstName() {        return firstName;    }    public void setFirstName(String firstName) {        this.firstName = firstName;    }    public String getLastName() {        return lastName;    }    public void setLastName(String lastName) {        this.lastName = lastName;    }    @Override    public int hashCode() {        final int prime = 31;        int result = 1;        result = prime * result                + ((firstName == null) ? 0 : firstName.hashCode());        result = prime * result                + ((lastName == null) ? 0 : lastName.hashCode());        return result;    }    @Override    public boolean equals(Object obj) {        if (this == obj)            return true;        if (obj == null)            return false;        if (getClass() != obj.getClass())            return false;        Name other = (Name) obj;        if (firstName == null) {            if (other.firstName != null)                return false;        } else if (!firstName.equals(other.firstName))            return false;        if (lastName == null) {            if (other.lastName != null)                return false;        } else if (!lastName.equals(other.lastName))            return false;        return true;    }    @Override    public int compareTo(Name o) {        int firstNameCom = this.firstName.compareTo(o.firstName);        return (firstNameCom !=0 ? firstNameCom:this.lastName.compareTo(o.lastName));    }    @Override    public String toString() {        return firstName +"-"+lastName;    }    } //测试类
     

package com.jckb;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class Test {    public static void main(String[] args) {        List
      
        list = new ArrayList
       
        ();        list.add(new Name("zhang","san"));        list.add(new Name("li","si"));        list.add(new Name("wang","wu"));        Collections.sort(list);        for(Name item : list){            System.out.println(item.toString());        }            }}