eclipse中运行java程序

 1 package ttt;
 2 
 3 public class Testttt {
 4     public static void main() {
 5         Person p =new Person();
 6         p.name="lucy";
 7         p.age=12;
 8         p.sex=1;
 9         p.study();
10         int a = p.addAge(2);
11         
12     }
13 
14 }

 1 package ttt;
 2 
 3 public class Person {
 4 
 5         public String name;
 6         public int age;
 7         public int sex;
 8 
 9         public void study() {
10             System.out.println("studing");
11         }
12         
13         public void showAge() {
14             System.out.println(age);
15         }
16         
17         public int addAge(int i) {
18             age+=i;
19             return age;
20         }
21 
22 }