作业第十四章

一简答题
1.根据目录结构myjava\practice1\Foo.java,写出Foo类的包名
答：包名为：myjava.practice1:
2.改写第12章中简答题第3题中的计算机类（Calculator)。要求将加减乘除的方法改成带参数的方法，再定义一个运算方法ope(),接收用户选择的运算和两个数字，根据用户选择的运算计算结果。
public class DJ14word2Calculator {
public double add(double num1,double num2){
System.out.print(num1+"+"+num2+"=");
return(num1+num2);
}
public double minus(double num1,double num2){
System.out.print(num1+"-"+num2+"=");
return(num1-num2);
}
public double multiple(double num1,double num2){
System.out.print(num1+""+num2+"=");
return(num1num2);
}
public double divide(double num1,double num2){
System.out.print(num1+"/"+num2+"=");
return(num1/num2);
}
public double ope(int op,double num1,double num2){
if(op1){
return add(num1,num2);
}else if(op2){
return minus(num1,num2);
}else if(op==3){
return multiple(num1,num2);
}else{
return divide(num1,num2);
}
}
}

import java.util.Scanner;
public class DJ14word2 {
@SuppressWarnings({ “resource” })
public static void main(String[] args) {
DJ14word2Calculator calc=new DJ14word2Calculator();
Scanner i=new Scanner(