add Intern

hutool-core/src/test/java/cn/hutool/core/lang/intern/InternUtilTest.java

@@ -0,0 +1,24 @@
+package cn.hutool.core.lang.intern;
+
+import cn.hutool.core.util.RandomUtil;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class InternUtilTest {
+
+	/**
+	 * 检查规范字符串是否相同
+	 */
+	@SuppressWarnings("StringOperationCanBeSimplified")
+	@Test
+	public void weakTest(){
+		final Interner<String> interner = InternUtil.createWeakInterner();
+		String a1 = RandomUtil.randomString(RandomUtil.randomInt(100));
+		String a2 = new String(a1);
+
+		Assert.assertNotSame(a1, a2);
+
+		Assert.assertSame(interner.intern(a1), interner.intern(a2));
+	}
+
+}