40 lines
1.5 KiB
Java
40 lines
1.5 KiB
Java
package com.inmind.collections04;
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import java.util.ArrayList;
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import java.util.Collections;
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/*
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static <T extends Comparable<? super T>> void sort(List<T> list) 根据其元素的自然排序，按照升序排列指定的列表。
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*/
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public class Demo14 {
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public static void main(String[] args) {
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//整数的自然排序，默认升序
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ArrayList<Integer> lists = new ArrayList<>();
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Collections.addAll(lists, 111, 22, 32, 4, 555);
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System.out.println(lists);
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//对集合进行排序
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Collections.sort(lists);
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System.out.println(lists);
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System.out.println("-------------------------------------");
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//字符串的默认排序，按照字典排序，按ASCII码值
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ArrayList<String> strs = new ArrayList<>();
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Collections.addAll(strs, "ab", "ba", "aa", "ca", "ac","bb");
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System.out.println(strs);
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//对集合进行排序
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Collections.sort(strs);
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System.out.println(strs);
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//自定义类的排序(Student)
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ArrayList<Student> students = new ArrayList<>();
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students.add(new Student("张三1", 18,88));
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students.add(new Student("张三2", 18,90));
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students.add(new Student("张三3", 18,93));
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students.add(new Student("张三4", 18,39));
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System.out.println(students);
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//注意：Collections.sort排序时，传入的集合的内容，必须拥有自然排序功能（实现Comparable）
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Collections.sort(students);
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System.out.println(students);
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}
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}
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