diff --git a/.idea/misc.xml b/.idea/misc.xml
index 87a20fc..62269df 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/main/java/nx/peter/java/util/Util.java b/src/main/java/nx/peter/java/util/Util.java
index 7b8e2be..e69bac0 100644
--- a/src/main/java/nx/peter/java/util/Util.java
+++ b/src/main/java/nx/peter/java/util/Util.java
@@ -147,7 +147,7 @@ else if (isObject(value))
             else if (isArray(value))
                 value = format ? toPrettyJson((List<Object>) value, indent + 1) : toJson((List<Object>) value, indent + 1);
             return (format ? "\n" + tab(indent + 1) : "") + value;
-        }).toList().toString();
+        }).collect(Collectors.toList()).toString();
     }
 
     public static String toJson(Map<String, Object> json, int indent, boolean format) {
@@ -160,7 +160,7 @@ else if (isObject(value))
             else if (isArray(value))
                 value = format ? toPrettyJson((List<Object>) value, indent + 1) : toJson((List<Object>) value, indent + 1);
             return (format ? "\n" + tab(indent + 1) : "") + "\"" + e.getKey() + "\": " + value;
-        }).toList().toString();
+        }).collect(Collectors.toList()).toString();
     }
 
 
@@ -1104,8 +1104,10 @@ public String toString() {
         }
     }
 
-    public record MinMax<N extends Number>(N min, N max) {
-        public MinMax {
+    public static class MinMax<N extends Number> {
+        protected N max, min;
+
+        public MinMax(N min, N max) {
             N a = min, b = max;
             if (a != null && b != null) {
                 if (a instanceof Integer) {
@@ -1218,6 +1220,8 @@ public record MinMax<N extends Number>(N min, N max) {
                     }
                 }
             }
+            this.max = max;
+            this.min = min;
         }
 
         public N diff() {
@@ -1294,6 +1298,14 @@ public boolean isLong() {
             return max instanceof Long;
         }
 
+        public N min() {
+            return min;
+        }
+
+        public N max() {
+            return max;
+        }
+
         @Override
         public String toString() {
             return "[min=" + min + ", max=" + max + ']';
@@ -1493,7 +1505,22 @@ public String toString() {
 
         }
 
-        public record DataCount<D extends Number>(D data, int count) implements Comparable<DataCount<D>> {
+        public static class DataCount<D extends Number> implements Comparable<DataCount<D>> {
+            protected int count;
+            protected D data;
+
+            public DataCount(D data, int count) {
+                this.data = data;
+                this.count = count;
+            }
+
+            public D data() {
+                return data;
+            }
+
+            public int count() {
+                return count;
+            }
 
             public boolean equals(DataCount<?> other) {
                 return other != null && equals(other.data()) && count == other.count;
@@ -1644,7 +1671,22 @@ public String toString() {
     }
 
 
-    public record TrimmedLine(String line, String trimmed) {
+    public static class TrimmedLine {
+        protected String line, trimmed;
+
+        public TrimmedLine(String line, String trimmed) {
+            this.line = line;
+            this.trimmed = trimmed;
+        }
+
+        public String line() {
+            return line;
+        }
+
+        public String trimmed() {
+            return trimmed;
+        }
+
     }
 
     public enum Position {
diff --git a/src/main/java/nx/peter/java/util/data/Index.java b/src/main/java/nx/peter/java/util/data/Index.java
index cb11658..dc217f4 100644
--- a/src/main/java/nx/peter/java/util/data/Index.java
+++ b/src/main/java/nx/peter/java/util/data/Index.java
@@ -161,7 +161,7 @@ public double getIndex() {
 				ind.append('.');
 			else
 				ind.append(getIndex(c));
-		return ind.isEmpty() ? 0 : (index > 0 ? -1 : 1) * Double.parseDouble(ind.toString());
+		return ind.toString().isEmpty() ? 0 : (index > 0 ? -1 : 1) * Double.parseDouble(ind.toString());
 	}
 
 	public Fraction toFraction() {
diff --git a/src/main/java/nx/peter/java/util/data/Letters.java b/src/main/java/nx/peter/java/util/data/Letters.java
index c8f5dbb..49db316 100644
--- a/src/main/java/nx/peter/java/util/data/Letters.java
+++ b/src/main/java/nx/peter/java/util/data/Letters.java
@@ -7,6 +7,7 @@
 
 import java.util.*;
 import java.util.concurrent.atomic.AtomicLong;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 
@@ -975,9 +976,9 @@ private int endIndexOf(CharSequence delimiter, int start, CharSequence ifContain
             // System.out.println(substring(start, end));
             Word sub = new Word(substring(start, end));
             if (containsAll(sub.get(), mustContain))
-                if (!ifContain.isEmpty() && sub.contains(ifContain)) {
+                if (!ifContain.toString().isEmpty() && sub.contains(ifContain)) {
                     String ender = getEndDelimiter(sub.get(), delimiter);
-                    if (mustEnd.isEmpty() || (ender != null ? sub.subLetters(0, sub.lastIndexOf(ender)) : sub.trim()).endsWith(mustEnd.toString()))
+                    if (mustEnd.toString().isEmpty() || (ender != null ? sub.subLetters(0, sub.lastIndexOf(ender)) : sub.trim()).endsWith(mustEnd.toString()))
                         return end;
                 } else return end;
         }
@@ -1196,7 +1197,7 @@ public Letters getParent() {
         }
 
         public List<D> toList() {
-            return stream().toList();
+            return new ArrayList<>(items);
         }
 
         public List<String> toStringList() {
diff --git a/src/main/java/nx/peter/java/util/data/Subscript.java b/src/main/java/nx/peter/java/util/data/Subscript.java
index 0a6357d..63c09f3 100644
--- a/src/main/java/nx/peter/java/util/data/Subscript.java
+++ b/src/main/java/nx/peter/java/util/data/Subscript.java
@@ -195,7 +195,7 @@ protected static String toSubscript(char data) {
 
 	protected static String toSubscript(CharSequence data) {
 		StringBuilder sub = new StringBuilder();
-		if (data != null && !data.isEmpty())
+		if (data != null && !data.toString().isEmpty())
 			for (char c : data.toString().toCharArray())
 				if (!isSubscript(c)) {
 					sub.append(toSubscript(c));
diff --git a/src/main/java/nx/peter/java/util/data/Superscript.java b/src/main/java/nx/peter/java/util/data/Superscript.java
index 0df403f..e6c0b49 100644
--- a/src/main/java/nx/peter/java/util/data/Superscript.java
+++ b/src/main/java/nx/peter/java/util/data/Superscript.java
@@ -253,7 +253,7 @@ protected static String toSuperscript(char data) {
 
 	protected static String toSuperscript(CharSequence data) {
 		StringBuilder sub = new StringBuilder();
-		if (data != null && !data.isEmpty())
+		if (data != null && !data.toString().isEmpty())
 			for (char c : data.toString().toCharArray())
 				if (!isSuperscript(c)) {
 					sub.append(toSuperscript(c));