java中构造方法的使用

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