Use bounded wildcards in API in static methods to make it more conventional and flexible

src/org/jetbrains/java/decompiler/main/ClassWriter.java

@@ -1065,7 +1065,7 @@ public class ClassWriter {
     return null;
   }
 
-  public static void appendTypeParameters(TextBuffer buffer, List<String> parameters, List<List<GenericType>> bounds) {
+  public static void appendTypeParameters(TextBuffer buffer, List<String> parameters, List<? extends List<GenericType>> bounds) {
     buffer.append('<');
 
     for (int i = 0; i < parameters.size(); i++) {

src/org/jetbrains/java/decompiler/modules/decompiler/DecHelper.java

@@ -12,7 +12,7 @@ import java.util.Set;
 
 public class DecHelper {
 
-  public static boolean checkStatementExceptions(List<Statement> lst) {
+  public static boolean checkStatementExceptions(List<? extends Statement> lst) {
 
     Set<Statement> all = new HashSet<>(lst);
 
@@ -55,7 +55,7 @@ public class DecHelper {
     return true;
   }
 
-  public static boolean isChoiceStatement(Statement head, List<Statement> lst) {
+  public static boolean isChoiceStatement(Statement head, List<? super Statement> lst) {
 
     Statement post = null;
 
@@ -189,7 +189,7 @@ public class DecHelper {
     return setHandlers;
   }
 
-  public static List<Exprent> copyExprentList(List<Exprent> lst) {
+  public static List<Exprent> copyExprentList(List<? extends Exprent> lst) {
     List<Exprent> ret = new ArrayList<>();
     for (Exprent expr : lst) {
       ret.add(expr.copy());

src/org/jetbrains/java/decompiler/modules/decompiler/ExprProcessor.java

@@ -794,7 +794,7 @@ public class ExprProcessor implements CodeConstants {
     return res;
   }
 
-  public static TextBuffer listToJava(List<Exprent> lst, int indent, BytecodeMappingTracer tracer) {
+  public static TextBuffer listToJava(List<? extends Exprent> lst, int indent, BytecodeMappingTracer tracer) {
     if (lst == null || lst.isEmpty()) {
       return new TextBuffer();
     }

src/org/jetbrains/java/decompiler/modules/decompiler/IfHelper.java

@@ -20,7 +20,7 @@ public class IfHelper {
     return res;
   }
 
-  private static boolean mergeAllIfsRec(Statement stat, Set<Integer> setReorderedIfs) {
+  private static boolean mergeAllIfsRec(Statement stat, Set<? super Integer> setReorderedIfs) {
     boolean res = false;
 
     if (stat.getExprents() == null) {
@@ -47,7 +47,7 @@ public class IfHelper {
     return res;
   }
 
-  public static boolean mergeIfs(Statement statement, Set<Integer> setReorderedIfs) {
+  public static boolean mergeIfs(Statement statement, Set<? super Integer> setReorderedIfs) {
     if (statement.type != Statement.TYPE_IF && statement.type != Statement.TYPE_SEQUENCE) {
       return false;
     }

src/org/jetbrains/java/decompiler/modules/decompiler/StrongConnectivityHelper.java

@@ -85,7 +85,7 @@ public class StrongConnectivityHelper {
     }
   }
 
-  public static boolean isExitComponent(List<Statement> lst) {
+  public static boolean isExitComponent(List<? extends Statement> lst) {
     Set<Statement> set = new HashSet<>();
     for (Statement stat : lst) {
       set.addAll(stat.getNeighbours(StatEdge.TYPE_REGULAR, Statement.DIRECTION_FORWARD));
@@ -95,7 +95,7 @@ public class StrongConnectivityHelper {
     return (set.size() == 0);
   }
 
-  public static List<Statement> getExitReps(List<List<Statement>> lst) {
+  public static List<Statement> getExitReps(List<? extends List<Statement>> lst) {
     List<Statement> res = new ArrayList<>();
 
     for (List<Statement> comp : lst) {