例：
创建一个老师类
类：老师
ClassTeacher{
属性（变量）
构造方法
方法（函数）
}
对象：x老师
New Teacher（） //每个被new出来的对象都具有该类里面的属性

代码1
package text;
public class test1 {
publicstatic void main(String[] args){
Teacherteacher = new Teacher();
Studentstudent = new Student(21,32);
teacher.tea();
System.out.println(teacher.age);
System.out.println(student.age);
System.out.println(student.cla);
}
}
class Teacher{
publicint age;
publicTeacher(){
age= 2;
}
voidtea(){
System.out.println("jiaoshu");
}
}
class Student
{
publicint age;
publicint cla;
publicStudent(int age,int cla){
this.age= age;
this.cla= cla;
}
voidstudy(){
System.out.println("xuexi");
}
}

代码2
package text;
public class task2 {
public static void main(String[] args){
People p = new People(10,11);
Student1 s = new Student1(22,33);
System.out.println(p.age+" "+p.height);
System.out.println(s.age+" "+s.cla+" "+s.height+" "+s.num);
p.eat();
s.eat();
}
}
class People{
int age;
int height;
public People(int a,int h){
age = a;
height = h;
}
public void eat(){
System.out.println("吃.......");
}
}
class Student1 extends People{
int cla;
int num;
public Student1(int a,int h){
super(a,h);
cla = a;
num = h;
}
}

extends
除了私有的其他的都会被继承下来

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