java compatibility with jdk 1.8, not 1.6

examples/DisShooting/nbproject/build-impl.xml

@@ -46,8 +46,8 @@ is divided into following sections:
         <property file="${user.properties.file}"/>
         <!-- The two properties below are usually overridden -->
         <!-- by the active platform. Just a fallback. -->
-        <property name="default.javac.source" value="1.6"/>
-        <property name="default.javac.target" value="1.6"/>
+        <property name="default.javac.source" value="1.8"/>
+        <property name="default.javac.target" value="1.8"/>
     </target>
     <target depends="-pre-init,-init-private,-init-user" name="-init-project">
         <property file="nbproject/configs/${config}.properties"/>