我正在尝试使用一个文件在命令窗口中创建一个菜单。用户从那些菜单选项中进行选择。他们被提示输入一个数字。该数字被传递给两个重载方法，这些方法确定该数字是整数还是浮点数。计算完成后，结果将打印到屏幕上并重新出现菜单。这是我的两个文件中的代码。
MyMathOpsTest 类：
import java.util.Scanner; // import Scanner class
public class MyMathOpsTest
{
//method to pause until a key is pressed
public static void pause()
{
try
{
System.out.print("Press <Enter> to continue...");
System.in.read();
}
catch (Exception e)
{
System.err.printf("Error %s%c\n",e.getMessage(),7);
}
}//end pause
public static void main( String args[] )
{
//variables to capture keyboard input
Scanner keyBd = new Scanner( System.in );
char selection;
//int selection;
do{//display menu
System.out.println( "1. Square a Number");
System.out.println( "2. Cube a Number");
System.out.println( "3. Raise a Number to a Power");
System.out.println( "4. Maximum of Three Numbers");
System.out.println( "5. Minimum of Three Numbers");
System.out.println( "6. Exit");
System.out.print( "Selection[1-6]: " );
//get menu selection
selection = keyBd.next().charAt(0);
//selection = keyBd.nextInt();
//process menu selection
switch (selection){
case '1':
MyMathOpsTest.squareTheNumber();
pause();
break;
case '2':
MyMathOpsTest.cubeTheNumber();
pause();
break;
case '3':
MyMathOpsTest.raiseTheNumber();
pause();
break;
case '4':
MyMathOpsTest.maximumNumber();
pause();
break;
case '5':
MyMathOpsTest.minimumNumber();
pause();
break;
case '6':
//recognize as valid selection but do nothing
break;
default :
System.out.printf("%c\n",7);
System.out.println("Invalid Selection");
}//end switch
}while( selection != '6');
} // end method main
public static void squareTheNumber()
{
}
public static void cubeTheNumber()
{
}
public static void raiseTheNumber()
{
}
public static void maximumNumber()
{
MyMathOps.maximum();
}
public static void minimumNumber()
{
}
} // end class MyMathOpsTest
MyMathOps 类：
import java.util.Scanner;
public class MyMathOps
{
public static int square(x:Integer):Integer
{
}
public static double square(x:Double):Double
{
}
public static int cube(x:Integer):Integer
{
}
public static double cube(x:Double):Double
{
}
public static int maximum(x:Integer, y:Integer, z:Integer):Integer
{
// create Scanner for input from command window
Scanner input = new Scanner( System.in );
// obtain user input
System.out.print( "Enter three integer values separated by spaces: ");
int numberl = input.nextInt();
// read first integer
int number2 = input.nextInt();
// read second double
int number3 = input.nextInt();
// read third double
// determine the maximum value
int result = maximum( numberl, number2, number3 );
// display maximum value
System.out.println( "Maximum is: " + result );
} // end method maximum
public static double maximum(x:Double, y:Double, z:Double):Double
{
// create Scanner for input from command window
Scanner input = new Scanner( System.in );
// obtain user input
System.out.print( "Enter three floating-point values separated by spaces: ");
number1 = input.nextDouble();
// read first double double
number2 = input.nextDouble();
// read second double
double number3 = input.nextDouble();
// read third double
// determine the maximum value
double result = maximum( numberl, number2, number3 );
// display maximum value
System.out.println( "Maximum is: " + result );
} // end method maximum
public static int minimum(x:Integer, y:Integer, z:Integer):Integer
{
// create Scanner for input from command window
Scanner input = new Scanner( System.in );
// obtain user input
System.out.print( "Enter three integer values separated by spaces: ");
int numberl = input.nextInt();
// read first integer
int number2 = input.nextInt();
// read second double
int number3 = input.nextInt();
// read third double
// determine the minimum value
int result = minimum( numberl, number2, number3 );
// display minimum value
System.out.println( "Minimum is: " + result );
} // end method minimum
public static double minimum(x:Double, y:Double, z:Double):Double
{
// create Scanner for input from command window
Scanner input = new Scanner( System.in );
// obtain user input
System.out.print( "Enter three floating-point values separated by spaces: ");
number1 = input.nextDouble();
// read first double double
number2 = input.nextDouble();
// read second double
double number3 = input.nextDouble();
// read third double
// determine the minimum value
double result = minimum( numberl, number2, number3 );
// display minimum value
System.out.println( "Minimum is: " + result );
} // end method minimum
} // end class MyMathOps
此代码是我自己键入的代码和我教科书中的示例代码的组合。这不会在 jGRASP 中为我编译。我得到这些错误。
MyMathOps.java:10: <identifier> expected
public static int square(x:Integer):Integer
^
MyMathOps.java:96: ')' expected
} // end method minimum
^
2 errors
----jGRASP wedge: exit code for process is 1.
----jGRASP: operation complete.
我在这里做错了什么？我花了几个小时研究这个并阅读我的教科书。如果我不明白这一点。我会得到一个不好的成绩。我需要在这门课上取得好成绩，这样我才能进入一流的计算机科学大学。谢谢你的帮助。
万一我的导师或盐湖社区学院的任何管理员遇到这个问题，让我明确表达我的意图。这个问题是本着学术诚信的最大精神发布的。我问这个问题是为了寻求一般建议和帮助，以了解使用 Java 编程语言的正确方法。我绝不会使用他人的作品并将其视为我自己的作品。我使用此处提供的答案作为我理解的一般帮助。我自己做所有的工作，不会复制回答我问题的人提供的工作。