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public static void move() { System.out.println("What do you want to do?"); Scanner scan = new Scanner(System.in); int userMove = scan.nextInt(); return userMove; } public static void usersMove(String playerName, int gesture) { int userMove = move(); if (userMove == -1) { break; }

通常,这可以通过更改方法签名匹配返回语句中的类型来修正错误。在这种情况下,void的实例可以改为int:

public static int move() { System.out.println("What do you want to do?"); Scanner scan = new Scanner(System.in); int userMove = scan.nextInt(); return userMove; }

阅读关于如何修复“Cannot Return a Value From Method Whose Result Type Is Void”错误的讨论。(@StackOverflow)

18.“Non-Static Variable … Cannot Be Referenced From a Static Context”

当编译器尝试从静态方法(@javinpaul)访问非静态变量时,就会发生此错误:

public class StaticTest {
    private int count=0; public static void main(String args[]) throws IOException { count++; //compiler error: non-static variable count cannot be referenced from a static context } }

要修复“Non-Static Variable … Cannot Be Referenced From a Static Context”错误,可以做这两件事:

  • 在签名中声明此变量为静态。
  • 在静态方法中写代码创建非静态对象的实例。

阅读此介绍静态和非静态变量之间区别的教程。(@sitesbay)

19.“Non-Static Method … Cannot Be Referenced From a Static Context”

此问题发生在Java代码尝试在非静态类中调用非静态方法的情况下。 例如,以下代码:

class Sample
{
   private int age;
   public void setAge(int a) { age=a; } public int getAge() { return age; } public static void main(String args[]) { System.out.println("Age is:"+ getAge()); } }

将返回错误:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
Cannot make a static reference to the non-static method getAge() from the type Sample

从静态方法中调用非静态方法就是声明调用非静态方法的类的实例。

阅读此关于非静态方法和静态方法之间区别的阐述

20.“(array) <X> Not Initialized”

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转载自www.cnblogs.com/edcr/p/10934477.html