add methods

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

@@ -0,0 +1,18 @@
+package cn.hutool.core.collection;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.List;
+
+public class ListUtilTest {
+
+	@Test
+	public void filterTest(){
+		List<String> a = ListUtil.toLinkedList("1", "2", "3");
+		final List<String> filter = ListUtil.filter(a, str -> "edit" + str);
+		Assert.assertEquals("edit1", filter.get(0));
+		Assert.assertEquals("edit2", filter.get(1));
+		Assert.assertEquals("edit3", filter.get(2));
+	}
+}