Lambda什么时候使用+简化匿名内部类

Lambda可以简化的内容:
	1.lambda中如果只有一条语句，可以把{}省略掉，如果有返回值return也省略掉
 	2.参数列表中的类型是可以推断出来的，所以可以省略
 	3.方法引用简化：   Comparator<String> comparator = String::comparaTo;

package d01_lamda;

import java.util.Comparator;

/**
 * zt
 * 2020/8/13
 * 9:42
 * Lambda
 *
 */
public class Demo1 {
    public static void main(String[] args) {
        //1.匿名内部类
        Runnable run1 = new Runnable() {
            @Override
            public void run() {
                System.out.println(Thread.currentThread().getName()+"执行了");
            }
        };
        run1.run();
        //优化匿名内部类
        Runnable run2 = ()-> System.out.println(Thread.currentThread().getName()+"执行了");
        run2.run();
        //2.匿名内部类
        Comparator<String> comparator = new Comparator<String>() {
            @Override
            public int compare(String o1, String o2) {
                return o1.compareTo(o2);
            }
        };
        System.out.println(comparator.compare("sad", "asfgasfg"));
        
        //优化
        Comparator<String> comparator2 = (String o1, String o2)-> {
                return o1.compareTo(o2);
            };
        //优化
        Comparator<String> comparator3 = (o1, o2)-> o1.compareTo(o2);
        Comparator<String> comparator4 = String::compareTo;
    }
}

main执行了
main执行了
18

Process finished with exit code 0