有人可以帮我修复此代码吗？ （Java方法）[关闭]

Question

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关闭7年前。

此代码是在屏幕上垂直显示我的名字的类，每个字母最多使用5行乘5列的字符输入，每个字母之间用空白行。

它正常工作，但问题是我对字符串使用了static，而我的教授说，代码中的任何地方都不应是static，而是main。当我从字符串c中删除static时，即使声明，它也会破坏代码main内部的字符串c

public class Lab3
{

    static String c;

    public static void main(String[] args)
    {

        Lab3 classy = new Lab3();
        Scanner input = new Scanner(System.in);

        System.out.print("Which character would you like to display?");

        c = input.next();

        System.out.println("My name is Jonathan");
        classy.displayLetterJ();
        classy.displayLetterO();
        classy.displayLetterN();
        classy.displayLetterA();
        classy.displayLetterT();
        classy.displayLetterH();
        classy.displayLetterA();
        classy.displayLetterN();

    }//end of main

    public void displayLetterJ()
    {
        System.out.println("  " + c + c + c);
        System.out.println("    " + c);
        System.out.println("    " + c);
        System.out.println(c + "   " + c);
        System.out.println(c + c + c + c + c);

    }

    public void displayLetterA()
    {
        System.out.println();
        System.out.println("   " + c);
        System.out.println("  " + c + " " + c);
        System.out.println(" " + c + " " + c + " " + c);
        System.out.println(c + "     " + c);
        System.out.println(c + "     " + c);

    }

    public void displayLetterO()
    {
        System.out.println();
        System.out.println("  " + c + c);
        System.out.println(" " + c + "  " + c);
        System.out.println(c + "    " + c);
        System.out.println(c + "   " + c);
        System.out.println("  " + c + c);

    }

    public void displayLetterN()
    {
        System.out.println();
        System.out.println(c + "    " + c);
        System.out.println(c + " " + c + "  " + c);
        System.out.println(c + "  " + c + " " + c);
        System.out.println(c + "   " + c + c);
        System.out.println(c + "    " + c);

    }

    public void displayLetterH()
    {//H accessor
        System.out.println();
        System.out.println(c + "   " + c);
        System.out.println(c + "   " + c);
        System.out.println(c + c + c + c + c);
        System.out.println(c + "   " + c);
        System.out.println(c + "   " + c);

    }

    public void displayLetterT()
    {
        System.out.println();
        System.out.println(c + c + c + c + c);
        System.out.println("  " + c);
        System.out.println("  " + c);
        System.out.println("  " + c);
        System.out.println("  " + c);

    }
}

Answer 1

我不知道这个的目的是什么...但是这应该在没有静态的情况下起作用

import java.util.Scanner;


/**
 *
 * @author john
 */
 public class Lab3 {


 public static void main(String[] args) {
     String c;
     Lab3 classy  = new Lab3();
     Scanner input=new Scanner(System.in);

          System.out.print("Which character would you like to display?");

          c = input.next();

        System.out.println("My name is Jonathan");
        classy.displayLetterJ(c);
        classy.displayLetterO(c);
        classy.displayLetterN(c);
        classy.displayLetterA(c);
        classy.displayLetterT(c);
        classy.displayLetterH(c);
        classy.displayLetterA(c);
        classy.displayLetterN(c);

      }//end of main
public void displayLetterJ(String c) {
    System.out.println("  "+c+c+c);
    System.out.println("    " +c);
    System.out.println("    " +c);
    System.out.println(c + "   " + c);
    System.out.println(c+ c+ c + c +c);

 }
 public void displayLetterA(String c){
    System.out.println();
    System.out.println("   "+c);
    System.out.println("  "+c+" "+c);
    System.out.println(" "+c+" "+c+" "+c);
    System.out.println(c+"     "+c);
    System.out.println(c+"     "+c);

}
  public void displayLetterO(String c){
    System.out.println();
    System.out.println("  "+c+c);
    System.out.println(" "+c+"  "+c);
    System.out.println(c+"    "+c);
    System.out.println(c+"   "+c);
    System.out.println("  "+c+c);

}
  public void displayLetterN(String c){
    System.out.println();
    System.out.println(c+"    "+c);
    System.out.println(c+" "+c+"  "+c);
    System.out.println(c+"  "+c+" "+c);
    System.out.println(c+"   "+c+c);
    System.out.println(c+"    "+c);

}
 public void displayLetterH(String c){//H accessor
    System.out.println();
    System.out.println(c+"   "+c);
    System.out.println(c+"   "+c);
    System.out.println(c+c+c+c+c);
    System.out.println(c+"   "+c);
    System.out.println(c+"   "+c);

}
  public void displayLetterT(String c){
    System.out.println();
    System.out.println(c+c+c+c+c);
    System.out.println("  "+c);
    System.out.println("  "+c);
    System.out.println("  "+c);
    System.out.println("  "+c);

    }

}

Answer 2

[主要问题是，如果变量不是static，那么它将附加到类的实例，因此您不能从static上下文中引用它。这是因为非静态变量表示特定实例的一种状态。

您的main()是静态的，因此c = ..是非法的。尝试使用classy.c = ..，以便您将引用在静态方法中创建的String实例的特定Lab3。

Answer 3

仅在方法main内部初始化String

String c = input.next（）;

Answer 4

您应该重构您的方法以通过这种方式使用字符c

public void displayLetterJ(String c)
{
   System.out.println("  "+c+c+c);
   System.out.println("    " +c);
   System.out.println("    " +c);
   System.out.println(c + "   " + c);
   System.out.println(c+ c+ c + c +c);
}

并以main的形式从main调用>

classy.displayLetterJ("*");
    

Answer 5

我认为您应该像这样使用私有实例字段c以及公共获取器和设置器：

Answer 6

有几个解决这个问题的方法，一个可能是：在主要方法中定义c字符串，然后将c字符串作为参数传递给所有方法。

Answer 7

更改