switch and list jdk functions

plugins/java/java.plugin.zsh

@@ -0,0 +1,25 @@
+function setjdk() {
+	if [ $# -ne 0 ]; then
+		removeFromPath '/System/Library/Frameworks/JavaVM.framework/Home/bin'
+		if [ -n "${JAVA_HOME+x}" ]; then
+			removeFromPath $JAVA_HOME
+		fi
+		export JAVA_HOME=`/usr/libexec/java_home -v $@`
+		export PATH=$JAVA_HOME/bin:$PATH
+		echo "JAVA_HOME = $JAVA_HOME"
+		java -version
+	fi
+}
+ 
+function removeFromPath() {
+  	export PATH=$(echo $PATH | sed -E -e "s;:$1;;" -e "s;$1:?;;")
+}
+
+function listjdk() {
+	/usr/libexec/java_home -V
+}
+
+alias jdk="listjdk"
+alias jdk6="setjdk 1.6"
+alias jdk7="setjdk 1.7"
+alias jdk8="setjdk 1.8"