public class Person {
	private String name;
	private String sex;
	private int age;
	private static Person pp=null;
	
	private Person(){
		
	}
	
	private Person(String name, String sex, int age) {
		super();
		this.name = name;
		this.sex = sex;
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}
	
	public static Person getperson(){
		if(pp==null){
			pp=new Person();
		}

---------------------------------------
public class Student {
	public static void main(String[] args) {
		
		Person pp=Person.getperson();
		pp.say();
	}
}