Java中类与对象

Student.java

public class Student {
    int age;
    //字符串用String，字符数组用char;
    String name;
    String address;
    String tel;
    void sayHello(){
        System.out.println("age = " + age);
        System.out.println("name = " + name);
        System.out.println("address = " + address);
        System.out.println("tel = " + tel);
    }
    int add(int num1,int num2){
        int r = num1 + num2;
        return r;
    }
}

TestStudent.java

public class TestStudent {
    public static void main(String[] args) {
        //Java中没有指针，但Java底层封装指针
        //本质上是C++创建的第二种方法
        Student zhangsan = new Student();
        //对象名.属性名访问属性
        //对象名.方法名调用方法
        zhangsan.age = 20;
        zhangsan.name = "zhangsan";
        zhangsan.tel ="110";
        zhangsan.address = "huxian";
        zhangsan.sayHello();
        int r = zhangsan.add(1,2);
        System.out.println("r = " + r);
    }
}