例如String测试(2)
names.java
import java.util.*;
public class names implements Comparable
{
private String firstName;
public names(String firstName)
{
if(firstName==null)
{
throw new NullPointerException();
}
this.firstName=firstName;
}
}
_______________
NameSort.java
import java.util.*;
class NameSort
{
public static void main(String args[])
{
names n=new names("niaho");
System.out.println(n);
}
}
运行结果 names@480457
haohao
2004-11-23 20:13:07
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