Build a JAVA environment and build a java environment

Build a JAVA environment and build a java environment

When we started automated testing this year, it took some time to build a Java environment; sorted out some information for easy access; and added some editing commands;

Among them, the "1" in the Ubuntu environment variable is in the correct order; others are also some methods for setting the environment variable (no operation is required ), however, my machine encountered an endless loop on the login interface (see figure 2). I have not figured out the cause now;

Leave notes and make changes later;

Because too much junk information is read every day, text is not easy to remember ,;