编写Java程序，模拟简单的计算器。 定义名为Number的类，其中有两个整型数据成员n1和n2，应声明为私有。编写构造方法，赋予n1和n2初始值，再为该类定义加（addition）、减（sub...

 1 public class Number {  2     private int n1;  3     private int n2;  4 public Number(int n1,int n2){  5     
 6     this.n1=n1;  7     this.n2=n2;  8  }  9     
10 public void addition(){ 11     p(n1+n2); 12 } 13 public void subtration(){ 14     p(n1-n2); 15 } 16 public void multiplication(){ 17     p(n1*n2); 18 } 19 public void division(){ 20 
21     p(n1/n2); 22 } 23 public void p(int n) 24 { 25 System.out.println(n); 26 } 27 
28 
29 
30 } 31 -------------------------------------------------------------------
32 public class Test { 33 
34     public static void main(String[] args) { 35         // TODO Auto-generated method stub
36         Number n=new Number(4,2); 37  n.addition(); 38  n.subtration(); 39  n.multiplication(); 40  n.division(); 41  } 42 
43 }