示例

public class Outer {

private final class Inner1 {

private final class Inner2 {

private final class Inner3 {

}
}
}

}

解决方案
移动嵌套的所有内部类,使它们成为最外层的内部类。

public class Outer {

private final class Inner1 {}

private final class Inner2 {}

private final class Inner3 {}

}