add RingIndexUtil

hutool-core/src/test/java/cn/hutool/core/collection/RingIndexUtilTest.java

@@ -1,39 +1,22 @@
 package cn.hutool.core.collection;
 
+import cn.hutool.core.lang.Assert;
 import cn.hutool.core.thread.ThreadUtil;
 import org.junit.Test;
 
 import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
-import java.util.concurrent.atomic.AtomicLong;
 
 /**
  * 集合索引环形获取工具类测试类
  *
  * @author ZhouChuGang
- * @version 1.0
- * @project hutool
- * @date 2021/10/13 18:47
  */
 public class RingIndexUtilTest {
 
 	private final List<String> strList = Arrays.asList("0", "1", "2", "3", "4", "5", "6", "7", "8", "9");
 
-	/**
-	 * 观察输出的打印为不重复的
-	 */
-	@Test
-	public void ringNextLongByObjTest() {
-		final AtomicLong atomicLong = new AtomicLong();
-		// 开启并发测试，每个线程获取到的元素都是唯一的
-		ThreadUtil.concurrencyTest(strList.size(), () -> {
-			final long index = RingIndexUtil.ringNextLongByObj(strList, atomicLong);
-			final String s = strList.get((int) index);
-			System.out.println(s);
-		});
-	}
-
 	/**
 	 * 观察输出的打印为不重复的
 	 */
@@ -44,7 +27,7 @@ public class RingIndexUtilTest {
 		ThreadUtil.concurrencyTest(strList.size(), () -> {
 			final int index = RingIndexUtil.ringNextIntByObj(strList, atomicInteger);
 			final String s = strList.get(index);
-			System.out.println(s);
+			Assert.notNull(s);
 		});
 	}