JAVA：类，对象，成员属性，成员方法，构造方法，类变量，类方法<2>

一.类的定义

一个全面的类定义是比较复杂的,  定义如下：

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alt="" />

二.类的对象

1.如何创建对象

类名 对象名=new 类名();

2.如何访问类的成员属性?

对象名.属性名

3.一个简单的程序实例

public class Demo1 {
    public static void main(String[] args) {
        //创建Cat的一个对象
        Cat cat1=new Cat();
        cat1.age=3;
        cat1.name="xiaohua";
        //创建Cat的第二个对象
        Cat cat2;
        //将cat1赋值给cat2
        cat2=cat1;
        System.out.println(cat2.age+" "+cat2.name);
    }
}

class Cat {
    int age;
    String name;
}

运行结果：

3 xiaohua

三.类的成员方法

1.类的成员方法的定义

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6Z3jEsUssKlWYA8sgPP6dAfs13Flq/7MXgeGytIrtItAhsZ7CcBFNxFH5U8MgIOD5iurAg98ilKy9o7bWt87/la3zM3DlSi3rdr7v8AP9H8uV/aA/ahv/hrrFr4e8P+HryPUri6htl1/wAQ6LqX9jNKzcW0T20Ekk87gEKI12c53EqUPonhP4yR+J9eh06bwj4r0O2ulkaz1bVtKe3tLnYwDA7j5sDHkqLiOIuBld1fD/iXwdYal4/1uPUPAHgzRL/SWaKbTvCOl2GoDT7UStvJG37LE7RhCbzU2hEah/Ktcgs3T/AL4QWHiTWZdNsdK8Ka756XF6+tal8PbXWNATbOES3ttRgjsRJMqnD7RJESrFNhDKd6dOLiuZ99f67W6Pye6b6KtKMU2tLaf8H8f8vL3z9qP9qH/hQ+k3qaWvh/UtZTT5LhbW81y3iureXjyi9k8kck0TfNzE5fI4Q9R5x4I/4KB6R8QfFnhPS7XVvCOg2M7TXGt3ut3k9uYLZI02KvnJFGlxJIxGxJJ1UIfmbrT/24NLvrWO31LxNpmn6v4HmaKxS91i6uptP0ORxiS6ksLS2WVncAxRyfaGKNKNoQM2fnjSD4S+F3wz1XxP4O0PQtI8c+JGvtDvPC8fiOTUZ9F0uWDY0t1A6M8axSQmR1lUsA+Gdf9WudCHPGUnr26a3dl6aq77b+dqnBwXMrX6+VtX8rO3nZddf0X0j4saT4w8FyeJvBdvdeObJbh7aOPRzFG87JIY3MbXMkMbKCCd2/DAZUtkZ890L9qC58aSacPD/gHU4IbnVrjS3u/Eeq6fYwlrcP9p8gRzzy3Dp5bALHGVbBO9QpNd1a6F53wd0vRPCOtWltZNpUFna63ZSIUitvKCieDCsjELyn8PQ9Bg/M/wCzl+zhpMvxAl8R6YNK8QeCPDFvc2nhrXv7Dt7S71W4kIBlknjwLpYFQolyVXzHkkYZADEcVGc0tle17/p36eb8teaHI6fM9309b9drrT7trbfQPgr41w/Ejxtosfhg22o+DNU0KTVY9Rmintrkutx5I2xyIMocN1CngEFga534u/tWaV8Kb7WdJvNGkh1a0tnltjea5okCT/KSjiGXUI5yhI6eWGODgZrmv2aPBusfDq+8B+HfEVp/Z2sab4IaG7tjKknlt9tJxvRip4I5BNcD8VtQ0HxTqPhzw54SuvHmn+HfE9++nXXjvUPFesLYxIIpJZBaw3F0BcBo4pB5xQwAEEGTlRNeCjJxpu61X/kzSd9PLX9TSilK0pron/5Km/10O1+GP7btr4z8O+FYZvDyan4s1SGHzrLS/EGhxBpWUFhFBJqRnB54SRQ3Y4PFe0fFP4sW3wlj0S/1fTLpvDt5eLaahrcckYg0reQsUk4LBtjOyqWUELyWI4z8nfDvQtHt/FHhvwvd/Em58L+DtLYwaXqUHjzU5ofGMAzDGlvLHcRW1uY2ZA0MO6QOoG1Uxv8Apv8AaOm0zQP2cPH66lMPsEfh66tg93IZGd2hMcQLMSWZnKAZJJJHUmtK3KvehHrt3Xbyf4p77WCFJTrxo7X0+b0v5/l69O68XeK9M8D+FdW8RaxObbSdLtZLy6mVC5WNFLMQoyScDoOtUfhx45X4keDrDxCmh614cS83ldO8QWn2W8jCuVBePc2A2Nw55BB714X+0xbeM7L9kyC3iOnG1i0iCPxV9vaQ3n2YRoJvspX5TNnP+s+Xr3r6Utdn2WHys+VsG3PpjiolFRclvZ2+7r6Pp6M5Yvmpwnazev5af5/IlooorIZzlz4EsLr4hWHjF5rkanZ6bNpccSsvkmKSRJGJG3O7Ma4O7GCeDXR0UVvVr1a6iqkr8qsvJdvxYeYUUUVgAUUV5ZN8cdRh07VLxvhZ44RNLmmjvFnTToPLSONH81HkvFSWNgxw0TPzG4bacZV0rtvbX5FRi5bHqdFeX+APjhdfEa00O/0/4deKrXR9Ygju7fUb2fS1RYHAKyvGt80oXBHAjLe1W/j18atK+A3w9ufEmopFdXDSx2lhp8t2lr9suXOEj81/lRcZZnPCqrMelVJODtL0+YRi5S5V/Xz2O0HhvSFv9QvhpdkL3UYkgvbkW6eZcxqCFSRsZdQGYANkDcfWuL/4Zv8AhJ/0S3wX/wCE9af/ABuqGgftPfDHUtD0+71H4geDtH1Ce3SS409/E1jM1tIVBaMukpVtpyNy8HGRXYfDz4jeHfit4VtvEnhXUDqmiXLyRw3fkSQiQo5RsLIqtgMpGcYOOKpwlFvyHeSV9bf1/kVoPhD4GtPCt74ZtvB2g2nh2+kEt1pNtpsMVrO4KkM8SqFY/InJH8I9Kx/+Gb/hJ/0S3wX/AOE9af8AxuvRaKm77i5pWtc5Twp8JfA/gPUJL/wz4M8P+Hb6SIwPdaTpcFrK0ZIJQtGgJXKqcdMgelZ+mfA7wbo1vrC2OnXVre6wQb/WItTuxqtwAVKq1/5v2naNigL5mABgDHFdnNqVnbXtvZy3UEV3chjBbvIBJKFGW2qTlsDk46UXmpWenNbi7uoLU3EohhE0gTzJD0Rcnljg8Dmjmffy/wCB95PPa+u2vzXX5HN6d8JvBmmeCz4Si8M6ZL4bchpdNu7ZbiK4fIYyTCTd5rllDF33MSMkk81T8W/A34e+O9I0zS9e8GaJqVhpiJHYQy2UYFpGpUiOIgAonyKCi4UgYII4rR1H4n+ENLubi1ufFehW17ASj29zqcMbI4/hYFsqc+1c94U+PnhHXdLln1HW9I0O8glaGW2n1a3cMy4y0TBvnjOeGwCcdBWH1mmpfHrvv203+Zk8TTpyUeez169evoXte+BXw78VazHquueCtD1u8is4tPhOp2MdzHDbxliiRxyAogBduVAJ4BJAGNSD4a+G9P8ACL+GNK0weHdDY7hbeHppNLKEtuJR7Zo3Qk9SpGeQcgmlfx7Y3fgweJtDgufE9g0fmpFpKq88q5+bajFcsOcpw3BGM8VzXxD+O+geBvDMt/Dc2Ooaqhhxok18ltdDeyg7kYFkKhiSCvGDnFVOtGF+d2/4JM8VTpw9pKeiV7+SXT5bWOo8D/Dvw58N9NmsvDmkw6bFcTNcXMqlpJ7qZjlpZ5nJkmkPd5GZj60msfDXwh4h8R2fiDVfCuianr1ls+zapeadDLdQbGLJslZSy7WJYYIwTkVc8P8Ai/Q/FaSnRtY0/VTCF84WN3HP5Wc4DbCcZwfyNReMddv/AA1or6jYaNNrpgZWms7V8TmLPzGJdp8xwOQmVz61cqnKvaN/M0jUi4c0Xp5GHrPwJ+GviPVLnU9W+HnhXVNSuX8ye8vdEtpppW/vM7ISx9yapf8ADN/wk/6Jb4L/APCetP8A43XZnxHp0Ntps15cx6a2oFEtoL9hBK8jDIjCMQd/+z14NZPxG8bnwH4fS+hsG1a/uLmKzs9PjlEbXE0jhQoYggcZOcdqUpqktXZLT/gfloN1koublolf5bmv4e8N6T4R0iDSdC0uy0XS7fd5Njp9ukEEe5izbUQBRliScDqSar+L/B2k+PNCm0bXLZ7zS52UzWqzyRJMAc7JNjLvQ9GRsqwyGBBxWdrPjeTSfF/hbQjp25tbWdmlecKbfyow5G0Ahic46ge5re0rWtO123efTb+11GBJGiaW0mWVVcdVJUkAjuKOZTb1u/8AL+txRqRcmk9f+Bf8jH8SfDPwh4x0iy0rXvC2jazpllj7LZ39hFNDb4XaPLRlITC8cY44rX0XQ9O8N6VbaZpGn2ulabbLsgs7KFYYYl9FRQAo9gKu0Vd3r5l9l2OY1j4W+C/EVve2+q+ENB1OC9ulvrqK80yGVbi4C7BNIGUhpAvyhjk44zim6V8KvBWhaBqGhab4P0DT9E1DP2zTbXTIIra5yAD5kaqFfgAfMD0rqaKXTl6Fcz7jIYY7eFIokWOJFCoiDCqBwAB2FefP+zl8JpHZ3+F/gxnY5LN4ftCSfX/V16JRTu73Em4qyZm+HfDWkeENIh0rQtKstE0uDcYrLTrdLeCPcSzbUQBRkkk4HUmsnwl8NtD8Dax4h1HRYZrI67ci8u7RbhzaifB3yxwk7I2cnLlQN5AJya6iijmervuI88b9nP4TvIZG+GHgxnJ3Fj4ftMk+ufLr0MAAYHAooou2rDbcnds5O7+FXhXUvG0Pi6/0ldT1+3UC0udQmkuUsuFBa2ikZo7djtXc0SqWxyTS+EfhZ4Z8EahqGo6XYSvqmoYW61LUbye/vJUAGIzPcO8nljHEe7aDkgAk11dFF3awNt3v1t+G33dOxxc/wW8Cy+GJ/DkXhXTNP0C5uVvLnTNMgFnb3UikH99HDtEqnaoZXBVgAGBHFdhbWsNlbRW1vDHBbwoI44YlCoigYCgDgADjAqSii7YNtu7OU8JfCbwV4B1S91Lwz4S0Xw/fXqhLifTLCK3aRQc4OxRxnnHc8nmrni74feF/H8NrD4n8OaT4jhtXMkEerWUdysTEYLKHUgHHet+ii708g5ndyvqzL8ReFNE8X6PJpGu6PYa1pUhUvY6japcQMVIK5RwVOCARxxisDxH8IvDPihvCiXdk8eneGZ0uNP0m1laGxDIoEW+BcI4jKqUBHyleOMg9nRQm1t6/PuK7tb+vP7zJ8XeFdN8deFtW8O6zAbnStUtZLO6hDlC8bqVYBgQQcHqOlUPhx4GX4b+DrDw8mua14jSz3hdR8QXf2q8kDOWAeTauQudo44AA7V0tFCbSaXX9P+HHdtWCiiikIKKKKACiiigCvqNrLe6fc28N5Np80sbIl3bBDJCSMB1DqyEjqNysOOQRxX5+fE+7ik0X4ieDPEvjtPHVzceIprO1stV8MjXdZ0wzGG3SWKb7Xb2tipaUbCUiXJITJ4r9C64vxB8GfBXiXQtU0i68PWttY6pex6lejSy1hLcXSSLIk7y25RzIHRW3bs5A5pxspe9t/wAFP9DenV5I263v+DPkTwF8OvEPw7+P/hIWGiWPgDxDq+iXGj2ePBVgtlJDAUmmuJfs2uSP5xARC5ySGxjqR6t+1Y2q/DzVPCHjPTfFniCzv9U8Rab4feOzgju47Gzl8z7R9ktPIkDTSFVO5klk+UIuFJQ+taJ8C/CWg+KtO8SRJrV9rWnJLHZ3Or+ItR1HyFlAWQItxPIo3ADPHYeld/XQ6zvCT1tv992vRrR+r6FRrcsm7XTVvwsn8tLeh8+fCjxR4q1D42apayeIfGmu+Brfw+s4uPFfhpdKAvjOQyg/YbYtiMAgAEfM3XHEv7J2oTj9lPStWb7Lo9xcx6lqAmO54I991O6zEFmO0ghyM9z06V6T8SvhRp/xPs0hvNa8S6JIgCrP4e126sCV3AsrJG4jcMAVJdGIDHaVPNXR4L/4Rz4fW/hfwWdP0CGytY7KwF9aPfW8ESgLtaPzY2k+UEZMmcnJ3cg4zlzUZRS97p/5M99O6+4SmnK3RtP0srfjq3puYf7PPi658dfBfwprd94ksfF1/c2n+k6zpsDQwXMqsVcqjIhXBBBBROQflXpXolch8JfhhpHwa+Huj+D9CMzadpqMqyXBBkkdnZ3dsAAFmZjgAAZwAABXS6tp/wDaul3dkLmez+0RNF9otiBLHuGNykggEZ4yDRXa5pOmrrW3Q5kraf1/Xz+ZwXw/B8Y+NfEHjJyXs42bRtKB6eTE376Vf9+UEA+kY9aLIHxx8Xbq9yW0nwpGbSEdVkvpVBlYf7kZVfq59K7Xw74etPC3h6w0bTw0VnZQLbxEkFsKMZPGCe5461W8G+EbPwToaaZZyz3K+bJPJcXTBpppJHLu7kAAkknoBXJGly8sb3Ubv1b6+l235O1tjjVObilJbu8vlsvlok+0bPczfin4oHhXwTqM8aGfULlDaWFqgy9xcyfLGijqeTk47AntXmk+jeI/hXY/DTw3p3ivUXmvb2GxuLRobNoUhVC8+wmDfgYwCWJwe5r1mDwVZL4pk8QXU91qOohSlr9rkDR2SEYZYUAAXPdjlz0LY4qtbfDbQ7fxDb62yX93qNsztbvfanc3KQFxhyiSSMq5HHA47YrJ0pymp7aq+r2Tvay3vqnrppvbXOvRqVndO1rpatNXtd6eisvK99dOb+PV7Y6Z4Ytr2SfUrLWIJ1Ol3WmI4YTkhVjeQRuqo5YAq4ww4AJrh/iR4d8X6hpGj/D221nSdWvrxo7qbbpcsT28MTiQzzSidgMuAoAjG4khQuOPb/EnhXS/F9lDaavai7t4Z47pE3sm2RDlGypB4Pbp61gXnwd8K3+p6pfzWd40+qOHvlGqXSxXRHAEkQl2MoHG0jGOMYqJ0akpNrZtPdra35vfy2s9VOLw08RzRVrSSW7WmvNtvpZLtdt3tZu8Ba3f+JTNfN4h0bWbONnt5I7DSprSeGZWwUk8y4cqRzlGUHkH6+b/ABq8CRWngfxdeQfD/wAHwRJazSLqkcoW8UYJ8wILT7/fHmdf4q9U0b4aeGPDd7qN1o+jwaPNqEK29x/Zxa3VkGcYVCArDJ+ZQG96pX3wi8PapZzWl7Jrl3aTKUlgn8Rag6SKeoZTPgj2NTXw9StR5LK9mt77+qb7P8NbJlToVJ0uSSV/W/5pnNeBfh7bCLRbi6+HXgu0hWGKX7fbSCS5VgoKuFNmvzZwfv8AHXJxVf456JbDUPDniHVrm5lsbDUoY47O2EmArZ81iqcyMwAUDHQkYOTXXj4S6AI4Y/N1wxwlTGh8RagVQjpgefgYrb13wzaeIn0trtpgNPu0vYkikKhpFBC7u5AznHcgZ4yD0So80eVpbp9+q6WS0Clh3Ci6cktvx+5dfU+NPHGl+G/+E30zXjd+GNBWaK5Y6Bb2kMqWJiTMUV3Em4NI54ZQgZSSASVBH1h8KNZsta8G2ctl4bn8JhRiXSprBrRYX6tsBVQykkkMvXPODkDZ1HwpYap4k0jXLgSNe6Wky2wD4QeYArEjucDA5xyeOmNissNhnh3Kz0f/AAet+tzLDYJ4etKpda+W+i89NVstPwsUUUV3nrBRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQBmal4p0XRtV03TNQ1ewsdS1NnSxs7m5SOa7ZRlhEjEFyAQTtBxmtOvCv2zPDmmXnwS1XxFNp1jc654ckttR0u7nQLcQyJdQuY4JQpZHl2CMBfvFlBr1rwT4o/4TTwppuuf2TqmhfbYvN/s7Wrb7PeQckbZY8na3HTPcVSV4c3n/w36/cVJWSa6/mt/wA1+Jt0UUVJIUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQB5P8f/h74z+KVhonhzQb/RNN8MXF7DPr89+kr3vlQzxTRrahfkyTGwbf2IxXrFFFO/u8vz/r7ht3t/X9f8MFFFFIQUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQB//Z" alt="" />

2.一个简单的程序实例

public class Demo2 {
    public static void main(String[] args) {
        Calculator calculator=new Calculator();
        calculator.calculate(100);
        System.out.println(calculator.add(100, 100));
    }
}

class Calculator{
    //成员方法
    public void calculate(int n){
        System.out.println(n*(n+1)/2);
    }
    public int add(int n1,int n2){
        return n1+n2;
    }
}

运行结果：

5050
200

四.类的构造方法

1.构造方法的特点

(1).构造方法名和类名相同;

(2).构造方法没有返回值;

(3).主要作用是完成对新对象的初始化;

(4).在创建对象时,系统自动调用该类的构造方法;

(5).一个类可以有多个构造方法;

(6).每个类都有一个默认的构造方法.

2.一个简单的程序实例

public class Demo3 {
    public static void main(String[] args) {
        Person p1=new Person();
        System.out.println("姓名:"+p1.name+"年龄:"+p1.age);

        Person p2=new Person(10,"xiaoming");
        System.out.println("姓名:"+p2.name+"年龄:"+p2.age);
    }
}

class Person {
    int age;
    String name;
    //空构造方法
    public Person(){
    }
    //有参构造方法
    public Person(int a,String n){
        age=a;
        name=n;
    }
}

运行结果：

姓名:null年龄:0
姓名:xiaoming年龄:10

五.类变量与类方法

1.类变量

(1).类变量是与类相关的, 是公共属性;

(2).加上static称为类变量或者静态变量, 否则称为实例变量;

(3).实例变量是属于每个对象个体的属性;

(4).类变量可以通过类名.类变量名或者对象名.类变量名直接访问.

2.类方法

(1).类方法是与类相关的, 是公共的方法;

(2).类方法中不能访问非静态变量;

(3).可以通过类名.类方法名或者对象名.类方法名使用.

3.简单的程序实例

public class Demo4 {
    public static void main(String[] args) {
        Child child1=new Child(8, "xiaohuang");
        child1.joinGame();
        Child child2=new Child(10, "xiaoming");
        child2.joinGame();

        //访问类变量
        System.out.println("共有"+child1.total+"个小孩参加游戏");
        System.out.println("共有"+child2.total+"个小孩参加游戏");
        System.out.println("共有"+Child.total+"个小孩参加游戏");
    }
}

class Child {
    int age;
    String name;
    //类变量(静态变量)
    static int total=0;
    public Child(int age,String name) {
        this.age=age;
        this.name=name;
    }
    //统计参加游戏的小孩人数
    public void joinGame() {
        total++;
    }
}

运行结果：

共有2个小孩参加游戏
共有2个小孩参加游戏
共有2个小孩参加游戏

public class Demo5 {
    static int i=1;
    static {
        i++;
    }
    public Demo5() {
        i++;
    }
    public static void main(String[] args) {
        System.out.println(i);

        Demo5 d1=new Demo5();
        System.out.println(i);

        Demo5 d2=new Demo5();
        System.out.println(i);
    }
}

运行结果：

2
3
4

public class Demo6 {
    public static void main(String[] args) {
        Stu stu1=new Stu(10,"xiaoming",120);
        Stu stu2=new Stu(20,"xiaohuan",320);
        System.out.println(Stu.getTotalFee());
    }
}

class Stu {
    int age;
    String name;
    static int totalFee=0;
    public Stu(int age,String name,int fee) {
        this.age=age;
        this.name=name;
        totalFee+=fee;
    }
    //静态变量用静态方法访问
    //静态方法只能访问静态变量
    //普通方法可以访问普通的成员变量,也可以访问静态变量
    public static int getTotalFee() {
        return totalFee;
    }
}

运行结果：

440