warning: lib.java/android.interface.jar(java/lang/Double.class): major version 52 is newer than 51, the highest major version supported by this compiler. It is recommended that the compiler be upgraded. warning: lib.java/android.interface.jar(java/lang/Boolean.class): major version 52 is newer than 51, the highest major version supported by this compiler. It is recommended that the compiler be u..

설치 방법$ sudo add-apt-repository ppa:openjdk-r/ppa $ sudo apt-get update $ sudo apt-get install openjdk-7-jdk 자바 버전이 여러개 설치되어 있는 경우$ update-java-alternatives --listjava-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64java-1.8.0-openjdk-amd64 1081 /usr/lib/jvm/java-1.8.0-openjdk-amd64 $ sudo update-java-alternatives -s java-1.7.0-openjdk-amd64자바 버전 확인$ java -versionjava version "1.7.0..