Question

class outer{
  int c,

  void values() {
    inner.a=3;
    inner.b=4;
  }

  void addvalues() {
      **inner.a += c;** // **How can I access the value of a=3 from the values() method?**
  }

  class inner{
      int a,b;
  }
}

Answer 1

1）您需要inner的实例来执行此操作

或

2）您可以将inner声明为static并使其变量a也为静态

Answer 2

您想在Outer类中创建Inner类的实例。此外，与任何其他类定义一样，只需在外部类中使用内部类的getter和setter。像这样：

public class Outer {

    private int c;
    private Inner inner = new Inner();

    public void values() {
        inner.setA(3);
        inner.setB(4);
    }

    public void addValues()
    {
        inner.setA(inner.getA() + inner.getB());
    }

    public int getA() {
        return inner.getA();
    }

    public static void main(String args[]) {
        Outer outer = new Outer();
        outer.values();
        outer.addValues();
        System.out.println(outer.getA());
    }

    class Inner {
        int a;
        int b;

        public int getA() {
            return a;
        }
        public int getB() {
            return b;
        }
        public void setA(int a) {
            this.a = a;
        }
        public void setB(int b) {
            this.b = b;
        }

    }

}

如何访问内部类的变量？

2 个答案: