java之初始化块的执行

目标：进一步了解自由块的运行机制

源文件：Person.java
package cn.com.Person;


public 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()
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);
}

{
name = "小明";
age = 20;
sex = "Female";
System.out.println("初始化后："+"name=" + name +"  age="+age+"  sex="+sex);
}

}



源文件：TestPerson.java

/*
 * author guojing
 * e-mail [e-mail]
 * 
 */

package cn.com.Person;


public class TestPerson {


/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub


Person person = new Person();

}

}

编译执行上面的程序，结果如下：
初始化后：name=小明  age=20  sex=Female
构造器Person()被调用
name=小明  age=20  sex=Male

可以看到，初始化（自由块）会先与构造器调用执行。