Detailed explanation of instances in Java objects and classes

I have been doing exercises in Eclipse. It’s the kind of doing an exercise and executing one. I just learned Java objects and classes. During the exercise, I put the class and execution in two .java files under the same package. is executable. (Get)

Related codes:

 1 public class Calc { 2     // 其本属性 3     int width = 90; 4     int height = 180; 5     String color = "绿"; 6  7     // 方法 8     int jia(int a, int b) { 9         return a + b;10     }11 12     int jian(int a, int b) {13         return a - b;14     }15 16     void jieshao() {17         System.out.println("我是计算器");18         System.out.println("我的长度是:" + height);19         System.out.println("我的宽度是:" + width);20         System.out.println("我的颜色:" + color);21     }22 }

 1 public class TestCalc { 2     public static void main(String[] args) { 3         Calc c = new Calc(); 4  5         c.jieshao(); 6  7         int a = 10; 8         int b = 20; 9 10         int result = c.jia(a, b);11 12         int result2 = c.jian(a, b);13 14         System.out.println("加法的结果:" + result);15         System.out.println("减法的结果是:" + result2);16     }17 }

Note: When calling, the class must be reassigned in the main function (in the above example, Calc c=new Calc();)

The rest Partly, I understand.

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