英文姓名排序小程序

为了练习Comparable接口，实现其compareTo方法，从而为英文姓名进行排序

这里一个姓名类，有成员变量firstName和lastName,都是String类型。这个姓名类需要实现Comparable接口，从而实现排序。

附代码：

package compare;
//英文姓名排序、通过实现Comparable接口实现compareTo方法来对饮用对象排序
import java.util.*;

public class TestSort {
    public static void main(String[] args) {
        List<Name> list = new ArrayList<Name>();
        list.add(new Name("j","J"));
        list.add(new Name("d","D"));
        list.add(new Name("b","B"));
        list.add(new Name("c","A"));
        list.add(new Name("a","A"));
        list.add(new Name("i","I"));
        list.add(new Name("f","F"));
        list.add(new Name("g","G"));
        list.add(new Name("h","G"));
        System.out.print(list);
        Collections.sort(list);
        System.out.println();
        System.out.print(list);
    }
}

class Name implements Comparable<Name> {
    private String firstName;
    private String lastName;

    Name(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getFirstName() {
        return this.firstName;
    }

    public String getLastName() {
        return this.lastName;
    }

    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("[").append(this.lastName).append(" ").append(this.firstName).append("]");
        return sb.toString();
    }

    public int compareTo(Name n) {
//        如果lastName不一样，比较当前对象和传进来对象的lastName的各个字母
//        如果lastName一样，那么比较firstName
//        如果lastName和firstName都 一样，表示名字一样，返回0
        if(lastName.compareTo(n.lastName) > 0) {
            return 1;
        } else if(lastName.compareTo(n.lastName) < 0) {
            return -1;
        }else {
            return firstName.compareTo(n.firstName);
        }
    }
}

运行结果图：

注：第一行是未排序前，第二行是排序后。