fixed static interface methods

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

@@ -624,7 +624,7 @@ public class ClassWriter {
 
       appendModifiers(buffer, flags, METHOD_ALLOWED, isInterface, METHOD_EXCLUDED);
 
-      if (isInterface && mt.containsCode()) {
+      if (isInterface && !mt.hasModifier(CodeConstants.ACC_STATIC) && mt.containsCode()) {
         // 'default' modifier (Java 8)
         buffer.append("default ");
       }

test/org/jetbrains/java/decompiler/SingleClassesTest.java

@@ -111,6 +111,7 @@ public class SingleClassesTest {
   //@Test public void TestSwitchOnStrings() { doTest("pkg/TestSwitchOnStrings");}
   @Test public void testVarArgCalls() { doTest("pkg/TestVarArgCalls"); }
   @Test public void testLambdaParams() { doTest("pkg/TestLambdaParams"); }
+  @Test public void testInterfaceMethods() { doTest("pkg/TestInterfaceMethods"); }
 
   private void doTest(String testFile, String... companionFiles) {
     ConsoleDecompiler decompiler = fixture.getDecompiler();

testData/results/TestInterfaceMethods.dec

@@ -0,0 +1,23 @@
+package pkg;
+
+public interface TestInterfaceMethods {
+   static void staticMethod() {
+   }// 4
+
+   default void defaultMethod() {
+   }// 5
+}
+
+class 'pkg/TestInterfaceMethods' {
+   method 'staticMethod ()V' {
+      0      4
+   }
+
+   method 'defaultMethod ()V' {
+      0      7
+   }
+}
+
+Lines mapping:
+4 <-> 5
+5 <-> 8

testData/src/pkg/TestInterfaceMethods.java

@@ -0,0 +1,6 @@
+package pkg;
+
+public interface TestInterfaceMethods {
+  static void staticMethod() {}
+  default void defaultMethod() {}
+}