package bbb;
public class Person {
 private String name;
 private int age;
 public Person(){
 }
 public Person(String name){
  this.name = name;
 }
 public Person(int age){
  this.age = age;
 }
 public Person(String name,int age){
  this.name = name;
  this.age = age;
 }
 public String getName(String name){
  return name;
 }
 public void setName(String name){
  this.name = name;
 }
 public int getage(int age){
  return age;
 }
 public void setAge(int age){
  if(age<0){
   this.age=0;
  }else{
   this.age = age;
  }
 }
 public void printMessage(){
  System.out.println("name = "+name+",age = "+age);
 }
 public void addAge(){
  age++;
 }
}

package bbb;
public class TestPerson{
 public static void main(String[] args) {
  Person p1 = new Person(" Cai Xukun ",30);
  p1.addAge();
  p1.printMessage();
  Person p2 = new Person(" Juen-Kai Wang ",20);
  p2.addAge();
  p2.printMessage();
  Person p3 = new Person();
 }
}

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