Testing claims made in http://stackoverflow.com/questions/4346521/what-are-the-dangers-in-upgrading-to-java-1-5-and-beyond/4346599#4346599

gistfile1.java

/**
 * Testing claims made in
 * http://stackoverflow.com/questions/4346521/what-are-the
 * -dangers-in-upgrading-to-java-1-5-and-beyond/4346599#4346599
 * 
 * @date Dec 3, 2010
 */
public class ClassLoadingTest {

    public static void main(String[] args) {

        OldStyleEnum ose = null;

        String test = "test";

        System.out.println("null OldStyleEnum == \"test\"? " + ((Object) ose == (Object) test));

        System.out.println("OldStyleEnum.ONE == OldStyleEnum.ONE? " + (OldStyleEnum.ONE == OldStyleEnum.ONE));
        System.out.println("OldStyleEnum.ONE == OldStyleEnum.TWO? " + (OldStyleEnum.ONE == OldStyleEnum.TWO));
    }

}


public class OldStyleEnum {

    static {
        System.out.println("OldStyleEnum static initializer run");
    }

    public static final OldStyleEnum ONE = new OldStyleEnum("ONE");

    public static final OldStyleEnum TWO = new OldStyleEnum("TWO");

    private String value;

    private OldStyleEnum(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }
}

This code outputs the following on a 1.6 JVM:

null OldStyleEnum == "test"? false
OldStyleEnum static initializer run
OldStyleEnum.ONE == OldStyleEnum.ONE? true
OldStyleEnum.ONE == OldStyleEnum.TWO? false