java基础篇（四）——C中struct和java中class

一、C语言中的struct

#include <stdio.h>struct person {char *name;

/*面向对象思想，为实现分层*/void (*printName)(struct person *per);};void printName(struct person *per){printf("guangdong %s\n", per->name);}int main(void){struct person p1 = {"zhangsan", printName};struct person p2 = {"lisi", printName};//printf("%s\n", p1.name);//printf("%s\n", p2.name);p1.printName(&p1);p2.printName(&p2);return 0;}

二、java中的class

class Person {static int count;String name;int age;String getName() {return "guangdong "+name;}/*静态代码块*/static {System.out.println("static block");}/*构造代码块*/{System.out.println("construct block");count ++;}/* construct method */

/*无参数构造方法*/public Person () {System.out.println("construct method: Person 1");name = "null";age  = 0;}/*有参数构造方法*/public Person (String name) {System.out.println("construct method: Person 2");this.name = name;}public Person (String name, int age) {System.out.println("construct method: Person 3");this.name = name;this.age  = age; }static void printPerson () {System.out.println("This is a class of Person");}};public class Oop5 {public static void main(String args[]) {Person p1 = new Person("zhangsan");Person p2 = new Person("lisi");Person p3 = new Person();Person p4 = new Person("wangwu", 6);System.out.println(p1.getName());System.out.println(p2.getName());System.out.println(p3.getName());System.out.println(p4.getName());Person.printPerson();System.out.println(Person.count);}}