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PATH=$JAVA_HOME/bin:$PATHso it finds the new version.PATHdefines where the shell looks for programs (likecat,ls,javaandjavac). It is searched from left to right. If you sayPATH=$JAVA_HOME/bin:$PATH, you put$JAVA_HOME/bin(/opt/jdk-11.0.2/bin) at the beginning ofPATH, so it looks there first. If you sayPATH=$PATH:$JAVA_HOME/bin, you put$JAVA_HOME/binat the end ofPATH— and the directory of OpenJDK version 10.0.2 is in the currentPATHvalue somewhere, so it will be found rather than 11.0.2.