获取其他类中的变量

您将得到空值，因为inString从未按Robert Kilar在注释中正确指出的那样进行初始化。

您可以通过使用类名来引用静态变量。

示例ClassName.variablename。就你而言

    main.inString

运行您的主类。当您运行inString时，将在该类的构造函数中对其进行初始化。现在，您可以在Myclass中引用相同的内容，如下所示。

public class main {public static StringBuffer inString;public main(){inString = new StringBuffer("Our aim is to make a 15 realistic game, where grinding powerlines and doing a tailwhip isn't easy, like in the real world. A game in which you will feel like you're actual riding. A game in which creativity and beauty are combined. ");inString = new StringBuffer(inString.toString().replaceAll(" +", " "));new MyClass();}public static void main(String[] args) {    new main();    }}

现在在MyClass中引用静态变量。

class MyClass {public MyClass() {    System.out.println("............."+main.inString);// refer to static variable}}

您还可以将变量传递给类的构造函数。

public class main {public  StringBuffer inString; public main()  {    inString = new StringBuffer("Our aim is to make a 15 realistic game, where grinding powerlines and doing a tailwhip isn't easy, like in the real world. A game in which you will feel like you're actual riding. A game in which creativity and beauty are combined. ");    inString = new StringBuffer(inString.toString().replaceAll(" +", " "));      new MyClass(inString); }public static void main(String[] args) {    new main();    }}

然后在Myclass

 public class MyClass {        public MyClass(StringBuffer value)        {          System.out.println("............."+value);        } }