java 8 Lambda排序

package com.ven.java8.lambda;

import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;

/**
 * 使用Lambda排序
 * 
 * @author xiaowen0623
 *
 */
public class LambdaSort {

	public static void main(String[] args) {
		List names = Arrays.asList("peter", "anna", "mike", "wbw");
		// 第一种排序方式
		Collections.sort(names, new Comparator() {
			@Override
			public int compare(String a, String b) {
				return a.compareTo(b);
			}
		});

		// 第二种
		Collections.sort(names, (String a, String b) -> {
			return b.compareTo(a);
		});

		// 第三种
		Collections.sort(names, (a, b) -> b.compareTo(a));
		System.out.println(names);

		List names2 = Arrays.asList("peter", null, "anna", "mike", "xenia");
		names2.sort(Comparator.nullsLast(String::compareTo));
		System.out.println(names2);

		List names3 = null;
		Optional.ofNullable(names3).ifPresent(list -> list.sort(Comparator.naturalOrder()));

		System.out.println(names3);
	}
}