testperson.java

新东方的

//class Person extends A
class Person
{
	String name;
	int age;
	String sex;
	
	public Person()
	{
		System.out.println("构造器Person()被调用");
		sex ="Male";
		System.out.println("name="+name+" ,age="+age+" ,sex="+sex);
	}
	public Person(String theName)
	{
		//调用构造器Person()		
		this();
		System.out.println("构造器Person(String theName)被调用");
		name = theName;
		System.out.println("name="+name+" ,age="+age+" ,sex="+sex);
	}
	public Person(String theName,int theAge)
	{
		//调用构造器Person(String theName)
		this(theName);
		System.out.println("构造器Person(String theName,int theAge)被调用");
		age = theAge;
		System.out.println("name="+name+" ,age="+age+" ,sex="+sex);
	}
	//初始化块
	{
		name = "Tony Blair";
		age = 50;
		sex = "Female";
		System.out.println("初始化块执行后：name="+name
			+" ,age="+age+" ,sex="+sex);
	}	
}
public class TestPerson
{
	public static void main(String[] args)
	{
		Person person = new Person();
	}
}