java中构造方法主要用于帮助新建的对象赋初值

class Person   {       public Person() {           System.out.println("public Person");       }   }      public class way {              public static void main(String args[]) {                  Person P=new Person();              }}

public Person

构造方法的重载

class Person   {       private int age;       private String name;       public String talk() {           return("我是:"                   +name+"，今年:"+age+"岁");       }       public Person(String n,int a) {           name=n;           age=a;          System.out.println("public Person(String n,int a)");       }   }      public class way {              public static void main(String args[]) {                  Person p=new Person("张三",25);                  System.out.println(p.talk());              }}

public Person(String n,int a)我是:张三，今年:25岁