Basic things

 package gen;


public class Main {
    public static void main(String[] args) {
        System.out.println("Hello" + 1 + 2 + 3);
        System.out.println(1 + 2 + 3 + "Hello");
        System.out.println((1 + 2 + 3) + "Hello");
        System.out.println("Hello" + (1 + 2 + 3));
    }
}
Output:
"C:\Program Files\Java\jdk1.8.0_281\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\lib\idea_rt.jar=4561:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_281\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_281\jre\lib\rt.jar;F:\Just Practice\Primitive Types\target\classes" gen.Main
Hello123
6Hello
6Hello
Hello6

Process finished with exit code 0

***     java.lang - avtomatik import olunur. 
Meselen: animal.* - animal paketinin icindeki butun klaslari import edir. Eger hemin paketin ecinde bawqa paketlerde varsa onlar import olunmayacaq.
*** Konkret importun ustunluyu wildcard importdan boyukdur.

package com.example.test;

public class Main {

    static int a; // static primitive variable, class primitive variable
    String b; // non static reference variable, instance reference variable

    public static void main(String[] args) {
        Test test = new Test(); // reference local variable
        int c; // primitive local variable
    }

}

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