今天继续学习,进入面向对象的学习.

1.输出换行可以这样输出

System.out.println();

2.数组学得有点蒙....

public class PracMultiArray {    public static void main(String[] args) {        int[][] a1 = {
   {1, 2, 4}, {3, 1, 2}, {14, 5, 3}};        System.out.println(a1[1][2]);        for(int i=0;i

3.类就是事物的集合和抽象,他所代表的就是这一类事物共用的一些行为和属性

4.java类的默认修饰符是default,介于protected和private之间

5.没有构造方法的情况下new一个构造方法,系统默认会赋一个初值,一般为空/0/false

6.this.name=name,前name是该类定义的一个属性,后面的name是构造函数的参数.

7.对象是类的实例化.

8.方法的重载

public class PracClassOverload {    int age;    String name;    char gender;    void tax(){        System.out.println("helloworld");    }    void tax(int age){        System.out.println("Mavic,man,"+age);    }    void tax(String name){        System.out.println(name+",man,6");    }    void tax(char gender){        System.out.println("Martin,10,"+gender);    }    public static int sayHello(int a,int b){        return a+b;    }    public static void main(String[] args){        int a=sayHello(6,8);        PracClassOverload p=new PracClassOverload();        p.tax();        p.tax('m');        p.tax("Mavic");        p.tax(18);    }}

9.构造方法的重载

public class PracClassGouZaoFangFa {    int age;    String name;    char gender;    public PracClassGouZaoFangFa(){}    public PracClassGouZaoFangFa(String name){        this.name=name;    }    public PracClassGouZaoFangFa(String name,int age){        this(name);//可以这样用        this.age=age;    }    public PracClassGouZaoFangFa(String name,int age,char gender){        this(name,age);//可以这样用        this.gender=gender;    }}

10.构造方法重载的调用

public class PracClassVerify {    public static void main(String[] args) {        PracClassGouZaoFangFa s1 = new PracClassGouZaoFangFa();        Prac(s1);        PracClassGouZaoFangFa s2 = new PracClassGouZaoFangFa("Mavic");        Prac(s2);        PracClassGouZaoFangFa s3 = new PracClassGouZaoFangFa("Mavic", 18);        Prac(s3);        PracClassGouZaoFangFa s4 = new PracClassGouZaoFangFa("Mavic", 8, 'm');        Prac(s4);    }    //通过定义一个静态方法来对构造方法进行调用    public static void Prac(PracClassGouZaoFangFa s) {        System.out.println("age:" + s.age);        System.out.println("name:" + s.name);        System.out.println("gender:" + s.gender);        System.out.println("--------haha--------");    }}

今天来了个徒弟......无伤大雅,幸运的是志邦还留着我以前发的图,星期六看看情况拉起,下星期完结这个java吧,准备入门android开发,就这样了,洗澡`~~~