collection容器的小程序
Student.java
package com.zyl;public class Student implements Comparable<Student>{private Long studentId;private String name;public Student(){}public Student(Long studentId,String name) {this.studentId=studentId;this.name = name;}public Long getStudentId(){return this.studentId;}public String getName() {return name=name;} public int hashCode(){ return studentId.hashCode(); } public boolean equals(Student stu){ if(stu==null) return false; boolean isResult = this.studentId.equals(stu.getStudentId())&&this.getName().equals(stu.getName()); return isResult; } public String toString(){ return "[studentId="+studentId+",name="+name+"]"; } public int compareTo(Student student) {// TODO Auto-generated method stubreturn this.getStudentId().compareTo(student.getStudentId());} }