How to install JDK 7 under MacOS

Apple no longer officially released JDK 7, if you want to use JDK 7 under MacOS now can download OpenJDK, download address is http://code.google.com/p/openjdk-osx-build/, on the page can also see the download of OpenJDK8, you can try new functions such as lambda. The 7u4 version is installed and downloaded. Like other installation programs in MacOS, The 7u4 version is a dmg suffix file. Double-click it to run it. A warning is displayed when you drag it into the system folder, it should be because JDK 6 already exists in the system. Enter the password to authorize the installation. Run JAVA_HOME in the Environment to run> export JAVA_HOME =/Library/Java/JavaVirtualMachines/1.7.0u4.jdk/Contents/Home> java-version www.2cto.com openjdk version "1.7.0-jdk7u4-b18" OpenJDK Runtime Environment (build 1.7.0-jdk7u4-b18-20120403) openJDK 64-Bit Server VM (build 23.0-b19, mixed mode) If you want to use JDK 7 by default, you can set it in "LaunchPad/utility/Java preference settings, the list of installed jdk in the system is displayed. Move JDK 7 to the first one. There are instructions for deleting the OpenJDK installation documentation, but I have not run sudo rm-rf/Library/Java/JavaVirtualMachines/1.7.0u4.jdk.