Java 深入学习static关键字和静态属性及方法

class student1{
String name;
int age;
String school="A大学";
public student1(String name,int age){
this.name=name;
this.age=age;
}
public void info(){
System.out.println("姓名："+this.name+"年龄："+this.age+"学校："+school);
}
}

public class Example{
public static void main(String[]args){
student1 stu1=new student1("张三",10);
student1 stu2=new student1("李四",20);
student1 stu3=new student1("王五",18);
stu1.info();
stu2.info();
stu3.info();
}
}

static String school="A大学";

stu1.school="B大学";//只修改stu1对象的学校属性

class Example{
public static void main(String[]args){
student1 stu1=new student1("张三",18);
student1 stu2=new student1("jason",19);
student1 stu3=new student1("小明",20);
stu1.setAge(20);//最终将实例stu1的年龄属性替换成20
stu2.setName("小红");//最终将实例stu2的名字属性替换成"小红”
//将所有实例的学校属性替换成B大学，由于它是使用static声明的，所以可以直接使用类名进行调用
student1.setSchool("B大学");
stu1.info();
stu2.info();
stu3.info();
}
}

class student1{
private String name;
private int age;
private static String school="A大学";
public student1(String name,int age){
this.name=name;
this.age=age;
}
public void info(){
System.out.println("姓名："+this.name+",年龄："+this.age+",学校："+school);
}
//将student1类的所有属性进行封装，要想更改属性就必须使用setter方法
public String getName(){
return name;
}
public void setName(String name){
this.name=name;
}
public int getAge(){
return age;
}
public void setAge(int age){
this.age=age;
}
public static String getSchool(){
return school;
}
public static void setSchool(String school){
student1.school=school;
}
}

class Example{
public static void main(String[]args){
student1 stu1=new student1();
student1 stu2=new student1();
student1 stu3=new student1();
}
}

class student1{
String name;
//构造代码块
{
System.out.println("我是构造代码块");
}
//静态代码块
static{
System.out.println("我是静态代码块");
}
//构造方法
public student1(){
System.out.println("我是student1类的构造方法");
}
}