無法對非靜態方法進行靜態引用。我該如何解決這個問題

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我的代碼不斷收到此錯誤錯誤：無法對類型爲RationalDriver的非靜態方法InputMenu（）或display_Menu（）進行靜態引用。我調用了這個方法，甚至試圖讓它們變成靜態的，這沒有幫助。我如何解決這個代碼。我是新手，所以請解釋一下，或者明確告訴我該怎麼做。謝謝無法對非靜態方法進行靜態引用。我該如何解決這個問題

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; 
} 
}

}

來源

2013-11-24 user2921727

你需要了解什麼'static'手段。 – SLaks

什麼是「非靜態」的意思。什麼是對象。 –

@HotLicks感謝 – user2921727

應該public static void InputMenu()

也應該display_menu()靜態以及

來源

2013-11-24 02:13:08 iWumbo

無法對非靜態方法進行靜態引用。我該如何解決這個問題

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