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Java中的内部类和静态嵌套类之间的主要区别是什么？设计/实施是否在选择其中一个方面发挥作用？

我正在研究Inner Class概念并编写以下代码_

public class InnerClassConcepts {
private int x = 11;

public static void main(String... args) {
    // method local 'x' variable
    int x = new InnerClassConcepts().new InnerA().new InnerB().x;

    InnerClassConcepts in = new InnerClassConcepts();
    InnerA InnerA = in.new InnerA();
    InnerA.InnerB xx = in.new InnerA().new InnerB();

    System.out.println("InnerClassConcepts`s x = " + in.x);
    System.out.println("InnerB`s x = " + xx.x);
    System.out.println("main`s x(local variable) = " + x);
    // System.out.println("InnerA`s x = " + InnerA.x);
    System.out.println("InnerA`s y = " + InnerA.y);
}

/**
 * …