Java 如何使用switch语句或循环从一种方法切换到另一种方法?
到目前为止,我已经能够创建方法并允许用户立即退出。我遇到的麻烦是 让用户选择加、减、乘、除操作 有选择操作的方法 然后继续执行getNumber语句和不同的操作 编辑:谢谢dawner帮我打电话,我欠你的 这是我到目前为止所拥有的Java 如何使用switch语句或循环从一种方法切换到另一种方法?,java,methods,switch-statement,calculator,Java,Methods,Switch Statement,Calculator,到目前为止,我已经能够创建方法并允许用户立即退出。我遇到的麻烦是 让用户选择加、减、乘、除操作 有选择操作的方法 然后继续执行getNumber语句和不同的操作 编辑:谢谢dawner帮我打电话,我欠你的 这是我到目前为止所拥有的 import java.util.*; import java.security.*; public class Project6 { public static void main(String[] args) { boolean Go =
import java.util.*;
import java.security.*;
public class Project6
{
public static void main(String[] args)
{
boolean Go = true;
while(Go)
{
Scanner input = new Scanner(System.in);
System.out.println("Choose an operation");
System.out.println("1 for Addition");
System.out.println("2 for Subtraction");
System.out.println("3 for Multiplication");
System.out.println("4 for Division");
System.out.println("5 to Quit");
int response=input.nextInt();
if(response == 5)
{
System.out.print("You have quit the calculator");
Go = false;
}
Operation(response);
}
}
public static void Operation(int response)
{
switch(response)
{
case 1: add(); break;
case 2: subtract(); break;
case 3: multiply(); break;
case 4: divide(); break;
default: System.out.println("Invalid Response");
}
}
public static void getNumber()
{
try
{
SecureRandom num = SecureRandom.getInstance("SHA1PRNG");
int digit1;
digit1 = num.nextInt();
int digit2;
digit2 = num.nextInt();
}
catch(NoSuchAlgorithmException nsae)
{
System.out.println("Is SHA1PRNG spelled correctly?");
}
}
public static void add(int digit1, int digit2)
{
Scanner input = new Scanner(System.in);
int sum;
sum = digit1 + digit2;
System.out.println("What is " + digit1 + " + " + digit2 + " ?");
int ans;
ans = input.nextInt();
if(ans == sum)
{
correctPrompt();
}
else
{
incorrectPrompt();
}
}
public static void subtract(int digit1, int digit2)
{
Scanner input = new Scanner(System.in);
if(digit2 > digit1)
{
int temp = digit1;
digit1 = digit2;
digit2 = temp;
}
int diff = digit1 - digit2;
System.out.println("What is " + digit1 + " - " + digit2 + " ?");
int ans;
ans = input.nextInt();
if(ans == diff)
{
correctPrompt();
}
else
{
incorrectPrompt();
}
}
public static void multiply(int digit1, int digit2)
{
Scanner input = new Scanner(System.in);
int product = digit1 * digit2;
System.out.println("What is " + digit1 + " * " + digit2 + " ?");
int ans = input.nextInt();
if(ans == product)
{
correctPrompt();
}
else
{
incorrectPrompt();
}
}
public static void divide(int digit1, int digit2)
{
int quotient;
quotient = digit1 / digit2;
int remainder = digit1 % digit2;
if(digit2 > digit1)
{
int temp = digit1;
digit1 = digit2;
digit2 = temp;
}
if(remainder == 0)
{
Scanner input = new Scanner(System.in);
System.out.println("What is " + digit1 + " / " + digit2 + " ?");
int ans = input.nextInt();
System.out.println("What is the remainder?");
int remainAns = input.nextInt();
if(ans == quotient && remainAns == remainder)
{
correctPrompt();
}
else
{
incorrectPrompt();
}
}
else
{
Scanner input = new Scanner(System.in);
System.out.println("What is " + digit1 + " / " + digit2 + " ?");
int ans;
ans = input.nextInt();
if(ans == quotient)
{
correctPrompt();
}
else
{
incorrectPrompt();
}
}
}
public static void correctPrompt()
{
try
{
String response;
response = "";
SecureRandom num = SecureRandom.getInstance("SHA1PRNG");
int randResponse;
randResponse = num.nextInt(4);
switch(randResponse)
{
case 0: response = "Excellent!"; break;
case 1: response = "Nice Work!"; break;
case 2: response = "Right - you rock"; break;
case 3: response = "Well Done"; break;
}
System.out.println(response);
}
catch (NoSuchAlgorithmException nsae)
{
System.out.println("Is SHA1PRNG spelled correctly?");
}
}
public static void incorrectPrompt()
{
try
{
String response= "";
SecureRandom num = SecureRandom.getInstance("SHA1PRNG");
int randResponse;
randResponse = num.nextInt(4);
switch(randResponse)
{
case 0: response = "No, please try again"; break;
case 1: response = "Oopsie! You are SO close!"; break;
case 2: response = "Don't give up - you can do this"; break;
case 3: response = "Promime no fumigare - Close, but no cigar"; break;
}
System.out.println(response);
}
catch (NoSuchAlgorithmException nsae)
{
System.out.println("Is SHA1PRNG spelled correctly?");
}
}
}
我能看到的最大问题是,您的操作方法是调用无参数的加法、减法、乘法和除法,但您已经定义了这些方法,每个方法取2位数。我假设你想让getNumber在这里工作,但getNumber目前只定义了2个数字,然后什么都不做。至少有一种方法可以让它编译:
public static void Operation(int response)
{
int digit1 = getNumber();
int digit2 = getNumber();
switch(response)
{
case 1: add(digit1, digit2); break;
case 2: subtract(digit1,digit2); break;
case 3: multiply(digit1,digit2); break;
case 4: divide(digit1,digit2); break;
default: System.out.println("Invalid Response");
}
}
public static int getNumber()
{
try
{
SecureRandom num = SecureRandom.getInstance("SHA1PRNG");
return num.nextInt();
}
catch(NoSuchAlgorithmException nsae)
{
System.out.println("Is SHA1PRNG spelled correctly?");
return 0;
}
}
那代码可以编译吗?对我来说,它看起来不应该。请澄清你想看到什么输出。请自己做作业。