Java sort用法详解（二维数组排序，List＜＞排序,lambada表达式，自定义类型排序）

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
 
public class SortExample {
 
    // 二维数组按照第一列排序
    public static void sort2DArray(int[][] array) {
        Arrays.sort(array, new Comparator<int[]>() {
            @Override
            public int compare(int[] o1, int[] o2) {
                return Integer.compare(o1[0], o2[0]);
            }
        });
    }
 
    // List按照自定义规则排序
    public static void sortListWithLambda(List<String> list) {
        list.sort((s1, s2) -> s1.compareTo(s2));
    }
 
    // List按照对象属性排序
    public static <T> void sortListByObjectProperty(List<T> list, final String propertyName) {
        list.sort(new Comparator<T>() {
            @Override
            public int compare(T o1, T o2) {
                try {
                    // 使用反射获取属性值
                    java.lang.reflect.Field field = o1.getClass().getDeclaredField(propertyName);
                    field.setAccessible(true);
                    Object val1 = field.get(o1);
                    Object val2 = field.get(o2);
                    return ((Comparable) val1).compareTo(val2);
                } catch (NoSuchFieldException | IllegalAccessException e) {
                    throw new RuntimeException(e);
                }
            }
        });
    }
 
    public static void main(String[] args) {
        // 二维数组排序示例
        int[][] array = {{2, 1}, {4, 3}, {1, 2}};
        sort2DArray(array);
        System.out.println(Arrays.deepToString(array));
 
        // List排序示例
        List<String> strings = Arrays.asList("banana", "apple", "cherry");
        sortListWithLambda(strings);
        System.out.println(strings);
 
        // 对象列表排序示例
        List<Person> people = Arrays.asList(new Person("John", 30), new Person("Alice", 25));
        sortListByObjectProperty(people, "age");
        System.out.println(people.stream().map(p -> p.getName() + ": " + p.getAge()).collect(Collectors.toList()));
    }
 
    static class Person {
        private String name;
        private int age;
 
        Person(String name, int age) {
            this.name = name;
            this.age = age;
        }
 
        public String getName() {
            return name;
        }
 
        public int getAge() {
            return age;
        }
    }
}

这个代码示例展示了如何使用Java的Arrays.sort