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First of all check current java versions, run following command in the terminal

/usr/libexec/java_home -V

which will output something like the following:

Matching Java Virtual Machines (2): 9, x86_64: "Java SE 9" /Library/Java/JavaVirtualMachines/jdk-9.jdk/Contents/Home 1.8.0_152, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home

Choose the version you want to be the default (1.8.0_152 for example) then put following in to your .bash_profile:

export JAVA_HOME=/usr/libexec/java_home -v 1.8.0_152

Also you can specify just the major version, if it's unique, like:

export JAVA_HOME=/usr/libexec/java_home -v 1.8
export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)

Now when you check

java -version

you will got following output:

java version "1.8.0_152" Java(TM) SE Runtime Environment (build 1.8.0_152-b16) Java HotSpot(TM) 64-Bit Server VM (build 25.152-b16, mixed mode)