J250913/java-base-project10/day20/src/com/sf/_03_collections/Test.java

package com.sf._03_collections;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Test {
    public static void main(String[] args) {
        /**
         * 排序
         * Collections.sort(集合 要求集合当中元素要实现compareable几口);
         */
        List<Integer> list = new ArrayList<>();
        list.add(2);
        list.add(1);
        list.add(5);
        list.add(4);
        list.add(3);
        Collections.sort(list);
        System.out.println(list);

        /**
         * 创建Student name  age
         * 想要进行降序排序
         */
        List<Student> students = new ArrayList<>();
//        students.add(new Student("zhangsan",30));
//        students.add(new Student("zhangsan3",40));
//        students.add(new Student("zhangsan2",20));
//        students.add(new Student("zhangsan5",10));
        Collections.sort(students);
        for (Student student : students) {
            System.out.println(student);
        }

        /**
         * binarySearch(list必须有序,查找元素)
         */
        System.out.println(Collections.binarySearch(list, new Integer(1)));
        /**
         * Collections.min 最小值   max 最大值
         */
        System.out.println("最大值为:"+ Collections.max(list));
        System.out.println("最小值为:"+ Collections.min(list));

        // 获取年龄最大学生和年龄最小的学生
        System.out.println(Collections.min(students));
    }
}