JAVA编程问题使用TreeSet类，实现按照英语成绩高低存放2个student对象。
可以依次取出,保存到二维数据,再用二维数组赋值给Jtable
排序的时候，对比不同的属性
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import java.util.Iterator;
import java.util.TreeSet;
public class Test {
public static void main(String[] args) {
TreeSet<Student> students = new TreeSet<>();
students.add(new Student("zhang san", 90));
students.add(new Student("li si", 75));
students.add(new Student("wang wu", 95));
students.add(new Student("zhao liu", 90));
Iterator<Student> iterator = students.iterator();
while (iterator.hasNext()) {
Student student = iterator.next();
System.out.println(student.getName() + " " + student.getEnglish());
}
}
}
class Student implements Comparable<Student> {
private String name;
private int english;
public Student() {
}
public Student(String name, int english) {
this.name = name;
this.english = english;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getEnglish() {
return english;
}
public void setEnglish(int english) {
this.english = english;
}
public int compareTo(Student o) {
if (this.english != o.english) {
return o.english - this.english;
} else {
return this.name.compareTo(o.name);
}
}
}
compareTo的实现方法是，先按照成绩由高到低排列，如果成绩一样那么就按照姓名排列。
package com.isoftstone.baidu;
import java.util.Iterator;
import java.util.TreeSet;
public class TreeSetDemo {
public static void main(String [] args) {
Student student1 = new Student();
student1.setName("张三");
student1.setEnglish(79f);
Student student2 = new Student();
student2.setName("李四");
student2.setEnglish(95f);
Student student3 = new Student();
student3.setName("王五");
student3.setEnglish(85f);
Student student4 = new Student();
student4.setName("赵六");
student4.setEnglish(68f);
TreeSet<Student> set = new TreeSet<Student>();
set.add(student1);
set.add(student2);
set.add(student3);
set.add(student4);
Iterator<Student> it = set.iterator();
while(it.hasNext()) {
Student temp = it.next();
System.out.println("姓名：" + temp.getName());
System.out.println("英语成绩：" + temp.getEnglish());
}
}
}
class Student implements Comparable<Student> {
private String name; // 姓名
private float english;// 英文成绩
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public float getEnglish() {
return english;
}
public void setEnglish(float english) {
this.english = english;
}
public int compareTo(Student anotherStudent) {
int thisVal = (int) this.getEnglish();
int anotherVal = (int) anotherStudent.getEnglish();;
return (thisVal < anotherVal ? -1 : (thisVal == anotherVal ? 0 : 1));
}
}
测试结果：
姓名：赵六
英语成绩：68.0
姓名：张三
英语成绩：79.0
姓名：王五
英语成绩：85.0
姓名：李四
英语成绩：95.0
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