java中封装encapsulate的概念

封装encapsulate的概念：就是把一部分属性和方法非公有化，从而控制谁可以访问他们。 https://blog.csdn.net/qq_44639795/article/details/101847882

class Test3 {

    int a; // default access访问

    public int b; // public access

    private int c; // private access

    // methods to access c

    void setc(int i) { // set c's value

        c = i;

    }

    int getc() { // get c's value

        return c;

    }

}

public class Test {

    public static void main(String args[]) {

        Test3 ob = new Test3();

        // These are OK，a and b may be accessed directly

        ob.a = 10;

        ob.b = 20;

        // This is not OK and will cause an error，错误

        //ob.c = 100; // Error!， 因为c是私有变量

        //你必须通过方法才能访问到c， You must access c through its methods

        ob.setc(100); // OK

        System.out.println("a，b，and c: " + ob.a + " " + ob.b + " " + ob.getc());

}

}

更多请见：https://blog.csdn.net/qq_44639795/article/details/101847882