源文件的名字必须和public class的名字一样，大写敏感。
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命名为Welcome2.java
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/**
* This program displays a greeting from the authors.
*
* @version 1.20 2004-02-28
* @author Cay Horstmann
*/
public class Welcome {
public static void main(String[] args) {
System.out.println("Welcome to Core Java");
}
}
class Welcome2 {
public static void main(String[] args) {
System.out.println("Welcome to Core Java");
}
}
