MacでJavaのバージョンを切り替える方法 ref: https://qiita.com/ponsuke0531/items/795cd00d93b71c14d07b

file0.txt

$ java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

file1.txt

$ /System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java_home -V
Matching Java Virtual Machines (5):
    1.8.0_131, x86_64:  "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home
    1.8.0_45, x86_64:   "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home
    1.7.0_67, x86_64:   "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_67.jdk/Contents/Home
    1.6.0_65-b14-468, x86_64:   "Java SE 6" /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
    1.6.0_65-b14-468, i386: "Java SE 6" /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home

file2.txt

$ sudo vi .bashrc
Password:{パスワード}

---ここからviエディタ------------------------------------------
<ここにはズゥっと前に書いた設定が書かれています>
export JAVA_HOME=`/System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java_home -v "1.7"`
PATH=$JAVA_HOME/bin:$PATH
---ここまでviエディタ------------------------------------------

file3.txt

$ source ~/.bashrc

file4.txt

$ java -version
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)