HDFFV-10703 Update CMake commands to latest standard

java/examples/datasets/CMakeLists.txt

@@ -87,7 +87,7 @@ MACRO (ADD_H5_TEST resultfile resultcode)
           -D "TEST_REFERENCE=datasets/${resultfile}.txt"
           -P "${HDF_RESOURCES_DIR}/jrunTest.cmake"
   )
-  if (NOT "${last_test}" STREQUAL "")
+  if (last_test)
     set_tests_properties (JAVA_datasets-${resultfile} PROPERTIES DEPENDS ${last_test})
   endif ()
   set (last_test "JAVA_datasets-${resultfile}")
@@ -96,7 +96,7 @@ ENDMACRO ()
 if (BUILD_TESTING)
 
   foreach (example ${HDF_JAVA_EXAMPLES})
-    if ("${example}" STREQUAL "H5Ex_D_External")
+    if (example STREQUAL "H5Ex_D_External")
       add_test (
           NAME JAVA_datasets-${example}-clear-objects
           COMMAND    ${CMAKE_COMMAND}
@@ -112,7 +112,7 @@ if (BUILD_TESTING)
               ${HDFJAVA_EXAMPLES_BINARY_DIR}/${example}.h5
       )
     endif ()
-    if (NOT "${last_test}" STREQUAL "")
+    if (last_test)
       set_tests_properties (JAVA_datasets-${example}-clear-objects PROPERTIES DEPENDS ${last_test})
     endif ()
     add_test (