Java code


    public class PrintWords {
    public static void main(String[] args) {
    System.out.println(
    Words.FIRST + " " + Words.SECOND + " " + Words.THIRD
    );
    }
    }

    public class Words{
    public static final String FIRST = "the";
    public static final String SECOND = null;
    public static final String THIRD = "set";
    }




编译PrintWords.java文件。
修改Words.java文件为

Java code


    public class Words{
    public static final String FIRST = "physics";
    public static final String SECOND = "chemistry";
    public static final String THIRD = "biology";
    }




问题：再次编译运行PrintWords.java，打印结果是什么？

Java code


    public class PrintWords {
    public static void main(String[] args) {
    System.out.println(
    Words.FIRST + " " + Words.SECOND + " " + Words.THIRD
    );
    }
    }

    public class Words{
    public static final String FIRST = "the";
    public static final String SECOND = null;
    public static final String THIRD = "set";
    }




编译PrintWords.java文件。
修改Words.java文件为

Java code


    public class Words{
    public static final String FIRST = "physics";
    public static final String SECOND = "chemistry";
    public static final String THIRD = "biology";
    }




问题：再次编译运行PrintWords.java，打印结果是什么？