str.equals("") replaced by str.isEmpty()

src/org/jetbrains/jet/j2k/visitors/ExpressionVisitor.java

@@ -58,7 +58,7 @@ public class ExpressionVisitor extends StatementVisitor {
     if (tokenType == JavaTokenType.OREQ) secondOp = "or";
     if (tokenType == JavaTokenType.GTGTGTEQ) secondOp = "cyclicShiftRight";
 
-    if (!secondOp.equals("")) // if not Kotlin operators
+    if (!secondOp.isEmpty()) // if not Kotlin operators
       myResult = new AssignmentExpression(
         expressionToExpression(expression.getLExpression()),
         new BinaryExpression(

src/org/jetbrains/jet/j2k/visitors/TypeVisitor.java

@@ -47,7 +47,7 @@ public class TypeVisitor extends PsiTypeVisitor<Type> {
   @Override
   public Type visitClassType(PsiClassType classType) {
     String classTypeName = createQualifiedName(classType);
-    if (classTypeName.equals(""))
+    if (classTypeName.isEmpty())
       classTypeName = getClassTypeName(classType);
     List<Type> resolvedClassTypeParams = createRawTypesForResolvedReference(classType);
 

test/org/jetbrains/jet/j2k/JavaToKotlinConverterTest.java

@@ -47,7 +47,7 @@ public class JavaToKotlinConverterTest extends LightDaemonAnalyzerTestCase {
     else if (javaFile.getParent().endsWith("/class")) actual = fileToKotlin(javaCode);
     else if (javaFile.getParent().endsWith("/file")) actual = fileToKotlin(javaCode);
 
-    assert !actual.equals("") : "Specify what is it: file, class, method, statement or expression";
+    assert !actual.isEmpty() : "Specify what is it: file, class, method, statement or expression";
 
     final File tmp = new File(kotlinPath + ".tmp");
     if (!expected.equals(actual)) writeStringToFile(tmp, actual);