1.修改创建线程池返回类

2.add Test

hutool-core/src/test/java/org/dromara/hutool/core/thread/ThreadUtilTest.java

@@ -28,6 +28,18 @@ import java.util.concurrent.atomic.AtomicInteger;
 public class ThreadUtilTest {
 
 
+	@Test
+	public void testNewFixedExecutor(){
+
+		ThreadPoolExecutor executor = ThreadUtil.newFixedExecutor(1, 2, "test-", true);
+
+		for (int i = 0; i < 20; i++) {
+			executor.execute(()->{
+				Console.log("执行任务1");
+			});
+		}
+
+	}
 	@Test
 	public void testNewExecutorByBlockingCoefficient(){
 		ThreadPoolExecutor executor = ThreadUtil.newExecutorByBlockingCoefficient(0.5f);