package com.imooc.collection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;
/**
* 将要完成:
* 1.通过Collections.sort()方法,对Integer泛型的List进行排序;
* 2.对String泛型的List进行排序;
* 3.对其他类型泛型的List进行排序,以Student为例。
*/
public class CollectionsTest {
/**
* 1.通过Collections.sort()方法,对Integer泛型的List进行排序;
* 创建一个Integer泛型的List,插入十个100以内的不重复随机整数
* 调用Collections.sort()方法对其进行排序
*/
public void testSort1(){
List<Integer>integerList = new ArrayList<Integer>();
//插入十个100以内的不重复随机整数
Random random = new Random();
Integer k;
for (int i=0;i<10;i++){
do {
k = random.nextInt(100);
}while (integerList.contains(k));
integerList.add(k);
System.out.println("成功添加整数:"+k);
}
System.out.println("----------排序前----------");
for (Integer integer:integerList){
System.out.println("元素:"+integer);
}
Collections.sort(integerList);
System.out.println("----------排序后-----------");
for (Integer integer:integerList){
System.out.println("元素:"+integer);
}
}
/**
* 2.对String泛型的List进行排序;
* 创建String泛型的List,添加三个乱序的String元素,
* 调用sort方法,再次输出排序后的顺序
*/
public void testSort2(){
List<String> stringList = new ArrayList<String >();
stringList.add("microsoft");
stringList.add("google");
stringList.add("lenovo");
System.out.println("--------排序前--------");
for (String string:stringList){
System.out.println("元素:"+string);
}
Collections.sort(stringList);
System.out.println("--------排序后--------");
for (String string:stringList){
System.out.println("元素:"+string);
}
}
public void testSort3(){
List<Student> studentList = new ArrayList<Student>();
Random random = new Random();
studentList.add(new Student(random.nextInt(1000)+"",",Mike"));
studentList.add(new Student(random.nextInt(1000)+"","Angela"));
studentList.add(new Student(random.nextInt(1000)+"","Lucy"));
System.out.println("--------排序前-------");
for (Student student:studentList){
System.out.println("学生:"+student.id+":"+student);
}
Collections.sort(studentList);
System.out.println("--------排序后-------");
}
public static void main(String[] args) {
CollectionsTest ct = new CollectionsTest();
// ct.testSort1();
// ct.testSort2();
ct.testSort3();
}
}