实在想不懂，为什么只循环一次？ - 黑马程序员技术交流社区

package test;
import java.util.Comparator;
import java.util.Iterator;
import java.util.TreeSet;
public class Test1
{
public static void main(String[] args)
{
TreeSet set=new TreeSet(new MyComparator());
Student s1=new Student("Tom",24, 89);
Student s2=new Student("Robin",32, 99);
Student s3=new Student("Jerry",24, 99);
Student s4=new Student("Lili",23, 87);
Student s5=new Student("Jack",22, 87);
Student s6=new Student("LiLei",25, 95);
Student s7=new Student("Robin",32 ,99);
set.add(s1);
set.add(s2);
set.add(s3);
set.add(s4);
set.add(s5);
set.add(s6);
set.add(s7);
for(Iterator ite=set.iterator();ite.hasNext();)
{
Student s=(Student) ite.next();
System.out.println("成绩："+s.getScore()+"年龄："+s.getAge()+"姓名："+s.getName());
}
}
}
class Student
{
String name;
int age;
int score;
public Student(String name, int age, int score)
{
this.age = age;
this.name = name;
this.score = score;
}
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;
}
public int getScore()
{
return score;
}
public void setScore(int score)
{
this.score = score;
}
}
class MyComparator implements Comparator
{
public int compare(Object o1, Object o2)
{
Student s1 = (Student) o1;
Student s2 = (Student) o2;
String n1 = s1.getName();
String n2 = s2.getName();
int l=Math.max(n1.length(), n2.length());
int a1 = s1.getAge();
int a2 = s2.getAge();
int sc1 = s1.getScore();
int sc2 = s2.getScore();
if (sc1 > sc2)
{
return -1;
}
else if (sc1 == sc2)
{
if (a1 > a2)
{
return 1;
}
else if (a1 == a2)
{
for (int i = 0; i < l-1; i++)
{
if (n1.charAt(i) > n2.charAt(i))
{
return 1;
}
if (n1.charAt(i) == n2.charAt(i))
{
return 0;
}
return -1;
}
}
return -1;
}
return 1;
}
}

复制代码

for (int i = 0; i < l-1; i++)
{
if (n1.charAt(i) > n2.charAt(i))
{
return 1;
}
if (n1.charAt(i) == n2.charAt(i))
{
return 0;
}
return -1;
}

复制代码

TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {
public int compare(Student s1, Student s2) {
int num = s1.getScore() - s2.getScore();
int num2 = (num == 0 ? s1.getAge() - s2.getAge() : num);
int num3 = (num2 == 0 ? s1.getName().compareTo(s2.getName())
: num2);
return num3;
}
});

复制代码