有没有办法在Java中模仿Ruby中的类-实例-变量概念？

class MyClass
  @@class_variable = "I am a class variable"

  def self.class_variable
    @@class_variable
  end
end

puts MyClass.class_variable  # 输出: I am a class variable

public class MyClass {
    private static String classVariable = "I am a class variable";

    public static String getClassVariable() {
        return classVariable;
    }
}

System.out.println(MyClass.getClassVariable());  // 输出: I am a class variable

class MyClass
  def initialize
    @instance_variable = "I am an instance variable"
  end

  def instance_variable
    @instance_variable
  end
end

obj = MyClass.new
puts obj.instance_variable  # 输出: I am an instance variable

public class MyClass {
    private String instanceVariable;

    public MyClass() {
        this.instanceVariable = "I am an instance variable";
    }

    public String getInstanceVariable() {
        return instanceVariable;
    }
}

MyClass obj = new MyClass();
System.out.println(obj.getInstanceVariable());  // 输出: I am an instance variable

public class MyClass {
    private static ThreadLocal<String> threadLocalVariable = ThreadLocal.withInitial(() -> "Thread-specific value");

    public static String getThreadLocalVariable() {
        return threadLocalVariable.get();
    }
}

// 在不同线程中使用
new Thread(() -> System.out.println(MyClass.getThreadLocalVariable())).start();
new Thread(() -> System.out.println(MyClass.getThreadLocalVariable())).start();