Java 无法对非静态方法进行静态引用。我该如何解决这个问题
我的代码不断出现以下错误:无法从类型RationalDriver对非静态方法InputMenu()或display_Menu()进行静态引用。我调用了这个方法,甚至尝试将它们设置为静态,但没有任何帮助。我将如何修复此代码的问题。我在这方面是新手,所以请解释一下,或者清楚地告诉我怎么做。多谢各位Java 无法对非静态方法进行静态引用。我该如何解决这个问题,java,methods,compiler-errors,static-methods,Java,Methods,Compiler Errors,Static Methods,我的代码不断出现以下错误:无法从类型RationalDriver对非静态方法InputMenu()或display_Menu()进行静态引用。我调用了这个方法,甚至尝试将它们设置为静态,但没有任何帮助。我将如何修复此代码的问题。我在这方面是新手,所以请解释一下,或者清楚地告诉我怎么做。多谢各位 import java.util.Scanner; import java.lang.String; public class RationalDriver{ public static int r
import java.util.Scanner;
import java.lang.String;
public class RationalDriver{
public static int rationalNum1, rationalDen1, rationalNum2, rationalDen2;
public static Rational r1, r2;
public static void main(String[] args){
Scanner in = new Scanner(System.in);
// first rational
System.out.println(" Input first rational number for the Numerator");
rationalNum1 = in.nextInt();
System.out.println(" Input first rational number for the Denominator");
rationalDen1 = in.nextInt();
if (rationalDen1 == 0){
System.out.println(" Cannont divide by zero ");
System.out.println(" please re enter another number ");
}
System.out.println("Rational Number #1 = ("+rationalNum1+"/"+rationalDen1+")"); //Displays 1st Rational Number
// second rational
System.out.println(" Input 2nd rational number for the 2nd Numerator");
rationalNum2 = in.nextInt();
System.out.println(" Input 2nd rational number for the 2nd Denominator");
rationalDen2 = in.nextInt();
if (rationalDen2 == 0){
System.out.println("Cannont divide by zero");
System.out.println(" please re enter another number");
}
System.out.println("Rational Number #2 = ("+rationalNum2+"/"+rationalDen2+")"); /// /Displays 2nd Rational Number
r1 = new Rational ( rationalNum1, rationalDen1);
r2 = new Rational ( rationalNum2, rationalDen2);
display_menu();
InputMenu() ;
}
// System.out.println;//toString
public void display_menu() //menu options
{
System.out.print(" Enter the corresponding number for the desired action ");
System.out.println("1) Addition\n2) 2) Subtraction\n3) 3) Multiplication\n4) 4)Division\n5) 5) Test for Eqaulity\n6) 6) Change 1st rational number\n7) 7) Change 2nd rational number");
}
public void question()
{
System.out.println("Do you want to exit? [y/n]"); // ask user if they want to quit with yes or no option
Scanner q = new Scanner(System.in);
switch (q.nextInt())
{
case 'y' :
System.out.println ("Thank you and goodbye.");
break;
case 'n' :
InputMenu();
break;
default:
System.err.println ( "Unrecognized option" );
break;
}
}
public void InputMenu() // keys for the menu
{
Scanner in = new Scanner(System.in);
display_menu();
int temp = in.nextInt();
switch (temp)
{
case 1: //addition
System.out.println ( "1" );
System.out.println( "(" +rationalNum1+ "/" +rationalDen1+ ") + (" +rationalNum2+ "/" +rationalDen2+ ") = " +r1.add(r2));
break;
case 2: //subtraction
System.out.println ( "2" );
System.out.println( "("+rationalNum1+"/"+rationalDen1+")"+ " - " + "("+rationalNum2+"/"+rationalDen2+")" + "=" + r1.subtract(r2));
break;
case 3: //mulitplication
System.out.println ( "3" );
System.out.println( "("+rationalNum1+"/"+rationalDen1+")"+ " * " + "("+rationalNum2+"/"+rationalDen2+")" + "=" + r1.multiply(r2));
break;
case 4: //division
System.out.println ( "4" );
System.out.println( "("+rationalNum1+"/"+rationalDen1+")"+ " / " + "("+rationalNum2+"/"+rationalDen2+")" + "=" + r1.divide(r2));
break;
case 5: //compare to
System.out.println ( "5" );
// question();
break;
case 6: //change the 1st Rational Number
System.out.println ( "6" );
System.out.println(" Input first rational number for the Numerator");
rationalNum1 = in.nextInt();
System.out.println(" Input first rational number for the Denominator");
rationalDen1 = in.nextInt();
if (rationalDen1 == 0){
System.out.println(" Cannont divide by zero");
System.out.println(" please re enter another number");
}
break;
case 7: //change the 2nd Rational Number
System.out.println ( "7" );
System.out.println(" Input 2nd rational number for the 2nd Numerator");
rationalNum2 = in.nextInt();
System.out.println(" Input 2nd rational number for the 2nd Denominator");
rationalDen2 = in.nextInt();
if (rationalDen2 == 0){
System.out.println("Cannont divide by zero");
System.out.println(" please re enter another number");
break;
}
default:
System.out.println ( "Unrecognized option" );
break;
}
}
}应该是
公共静态无效输入菜单()
还应使
显示_menu()
也成为静态的您需要理解静态
的含义以及“非静态”的含义。“这是什么东西?”霍特里克斯明白了,谢谢