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摘要：新建函数接口 Operation @FunctionalInterface public interface Operation<R, T> { R operator (T t1, T t2); } 在测试类中实现 public class TestDemo { @Test public void 阅读全文

摘要：default关键字 定义一个Animal接口 其中breath用default修饰。 public interface Animal { void run(); void eat(); default void breath(){ System.out.println("呼吸"); } } 定义一 阅读全文

摘要：public class DeadLockDemo { private static final Object HAIR_A = new Object(); private static final Object HAIR_B = new Object(); public static void m 阅读全文

摘要：public class TestDemo { @Test public void testCountDownLatch() throws InterruptedException { CountDownLatch countDownLatch = new CountDownLatch(5); fo 阅读全文