java - 基本Java : How to call a method?

Question

我正在尝试创建一个包含菜单的程序，并将执行用户选择的任何选择。我完成了这些方法并让它们进行编译，但不知道如何调用这些类。以下是屏幕截图中的代码，以便更容易阅读:

极客类:(包含所有方法)

    public class Geek{
    private String name;
    private int numberofQuestions=0;

    public Geek (String name){
        this.name = name;
        numberofQuestions = 0;

    }
    public String getName(){
        return name;

    }
    public int getnumberofQuestions(){
        return numberofQuestions;
    }
    public boolean allTheSame(int num1, int num2, int num3){

        numberofQuestions++;
        if(num1 == num2 && num2 == num3 && num1 == num3){
            return true;}
            else return false;
        }
    public int sum (int num1, int num2){
        numberofQuestions++;
        int largest = Math.max(num1, num2);
        int smallest = Math.min(num1, num2);
        int result =0;
        for (int i=smallest; i <= largest;i++){
        result = result + i;}
        return result;

    }
    public String repeat(String str, int n){
        numberofQuestions++;
        String repetition = "";
        for (int j=0; j < n; j++){
        repetition = repetition + str;}
        return repetition;

        }


    public boolean isPalindrome(String str){
        numberofQuestions++;
        int n = str.length();
        for( int i = 0; i < n/2; i++ )
        if (str.charAt(i) != str.charAt(n-i-1)) return false;
    return true;
    }

}

主要:

/image/E2z3a.png

编辑:我在这部分代码中遇到找不到符号错误:

case "d":
        myGeek.sum(num1, num2, num3);
        System.out.println("Enter the first number");
        int num1 = scan.nextInt();
        System.out.println("Enter the second number");
        int num2 = scan.nextInt();
        System.out.println("Enter the third number");
        int num3 = scan.nextInt();
        break;

Answer 1

类不会被调用，它们是创建对象的蓝图。

您需要一个程序入口点，在本例中是在您的类中，如下所示

public static void main(String[] args)
{
  Geek myGeekObject = new Geek("Your name");
}

然后您可以调用创建的对象上的方法

public static void main(String[] args)
{
  Geek myGeekObject = new Geek("Your name");
  String geekName = myGeekObject.getName();
}