1、卸载掉旧的jdk,安装jdk1.8,更改JAVA_HOME环境变量为jdk1.8的路径。
2、在Eclipse中打开Help > Install New Software...,输入地址
http://download.eclipse.org/eclipse/updates/4.3-P-builds/
并安装,安装完后重启Eclipse。
3、右键工程,打开properties,选择Java Compiler,选择Compiler Compliance Level。
4、还是properties窗口,选择Java build path,点开libraries标签,点击 Add Library,选择JRE System Library.,选择Alternate jres,选择1.8
参考http://im-a-developer-too.blogspot.ca/2014/04/configuring-java-environment-jre-jdk-in.html
http://stackoverflow.com/questions/15027255/eclipse-java-8-support