Fix warnings from new ErrorProne rules

README.md

@@ -7,7 +7,7 @@
 [![Bugs](https://raw.githubusercontent.com/uhafner/codingstyle/main/badges/bugs.svg)](https://github.com/uhafner/codingstyle/actions/workflows/quality-monitor-pit.yml)
 
 Each Java project should follow a consistent coding style.
-I.e., all contributions to the source code should use the same formatting rules, design principles, code patterns, idioms, etc. 
+All contributions should follow the same formatting rules, design principles, code patterns, and idioms.
 This coding style provides the set of rules that I am using in my lectures about software development at Munich University of Applied Sciences.  
 
 This project describes the coding style in detail (currently only available in German) and serves as a template project. 

src/main/java/edu/hm/hafner/util/LineRangeList.java

@@ -317,7 +317,7 @@ private void write(final LineRange r) {
          *
          * @return {@code true} if the read value is equal to the specified range
          */
-        public boolean compare(final LineRange other) {
+        private boolean compare(final LineRange other) {
             int s = read();
             int d = read();
             return other.getStart() == s && other.getEnd() == s + d;
@@ -366,7 +366,7 @@ public int previousIndex() {
             throw new UnsupportedOperationException("previousIndex is not supported");
         }
 
-        public Cursor copy() {
+        private Cursor copy() {
             return new Cursor(position);
         }
 
@@ -389,7 +389,7 @@ private void adjust(final int diff) {
          *
          * @return the changed line range
          */
-        public LineRange rewrite(final LineRange other) {
+        private LineRange rewrite(final LineRange other) {
             var c = copy();
             var old = c.next();
             int oldSize = c.position - position;
@@ -419,7 +419,7 @@ public void add(final LineRange v) {
          *
          * @return the deleted element
          */
-        public LineRange delete() {
+        private LineRange delete() {
             var c = copy();
             var old = c.next();
             adjust(position - c.position);

src/main/java/edu/hm/hafner/util/TreeStringBuilder.java

@@ -79,7 +79,7 @@ private static final class Child {
          *
          * @return the node
          */
-        public Child intern(final String string) {
+        private Child intern(final String string) {
             if (string.isEmpty()) {
                 return this;
             }