public class Person{
private int age=0;
private String name="noname";
private char sex='M';
public Person (){}
public Person (String n,int a,char s){
name=n;
if(a>=0&&a<140)age=a;
else age=0;
if(s=='M')sex=s;
else sex='F';
}
public void introduceme(){
System.out.println("my name is: "+name+"\tmyage is :"+age);
if(sex=='M')System.out.println("l am man!");
else System.out .println("l am woman !");
}
public String getName(){return name;}
public void setName(String n){name=n;}
public int getAge(){return age;}
public void setAge(int a){

if(a>=0&&a<140)age=a;
else age=0;

}
public char getSex(){return sex;}
public void setSex(char s){
if(s=='M')sex='M';
else sex='F';

}
public boolean equals(Person a){
if(this .name.equals(a.name)&&this.age==a.age&& this.sex==a.sex)
return true;
else
return false;
}
public String toString(){
return name+","+sex+","+age;
}

}
class PersonTest{
public static void main(String args[]){
Person p1,p2;
p1=new Person("张兰",28,'M');
p2=new Person();
p2.setName("陈红");
p2.setAge(38);
p2.setSex('F');
p1.introduceme();
p2.introduceme();

}
}

运行时Person类中找不到主方法