/*** 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变量n1和n2应该声明为私有* 编写构造方法赋予n1和n2初始值* 再为该类定义加addition()、减subtration()、乘multiplication()、除division()等公有实例方法，分别对两个成员变量执行加减乘除运算* 在main方法中创建Number类的对象调用各个方法并显示计算结果*/
class NumberText{public static void main(String[] args) {
//        调用无参构造方法创建对象Number number1 = new Number();
//        调用set方法赋值number1.setN1(10);number1.setN2(3);
//        调用加减乘除方法进行计算number1.addition();number1.subtration();number1.multiplication();number1.division();//        调用有参构造方法创建对象Number number2 = new Number(30,0);
//        调用加减乘除方法number2.addition();number2.subtration();number2.multiplication();number2.division();}
}
class Number{private int n1;private int n2;
//    无参构造方法public Number() {}//    有参构造方法public Number(int n1, int n2) {this.n1 = n1;this.n2 = n2;}//    set and getpublic int getN1() {return n1;}public void setN1(int n1) {this.n1 = n1;}public int getN2() {return n2;}public void setN2(int n2) {this.n2 = n2;}
//    加法public void addition(){System.out.println(getN1() + "+" + getN2() + "=" + (getN1() + getN2()));}
//    减法public void subtration(){System.out.println(getN1() + "-" + getN2() + "=" + (getN1() - getN2()));}
//    乘法public void multiplication(){System.out.println(getN1() + "*" + getN2() + "=" + (getN1() * getN2()));}
//    除法public void division(){if (n2 == 0){System.out.println("除数不能为零！");return;}System.out.println(getN1() + "/" + getN2() + "=" + (getN1() / getN2()));}
}