How to change default Java version

1: First run /usr/libexec/java_home -V which will output something like the following:

Matching Java Virtual Machines (2):
    1.8.0_25, x86_64:   "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home
    1.7.0_75, x86_64:   "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_75.jdk/Contents/Home

/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home

2: Pick the version you want to be the default (1.7.0_75 for arguments sake) then:

export JAVA_HOME=`/usr/libexec/java_home -v 1.7.0_75`

3: Now when you run java -version you will see:

java version "1.7.0_75"
Java(TM) SE Runtime Environment (build 1.7.0_75-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.75-b04, mixed mode)

4: Just add the above export JAVA_HOME … line to your shell’s init file(/.bash_profile).