spetial jvm intern

class Main {
    public static void main(String[] args) {
        System.out.println(System.getProperty("java.version"));
        System.out.println(System.getProperty("java.vendor"));
        System.out.println(System.getProperty("java.vendor.url"));
        System.out.println(System.getProperty("java.home"));
        System.out.println(System.getProperty("java.vm.specification.version"));
        System.out.println(System.getProperty("java.vm.version"));
        System.out.println(System.getProperty("java.vm.vendor"));
        System.out.println(System.getProperty("java.vm.name"));
        String s1 = new StringBuilder("go").append("od").toString();
        System.out.println(s1.intern() == s1);
        String s2 = new StringBuilder("ja").append("va").toString();
        System.out.println(s2.intern() == s2);
    }
}