Java 报错 No enclosing instance of type B is accessible. Must qualify the allocation with an enclosin

报错 No enclosing instance of type B is accessible. Must qualify the allocation with an enclosin"/>

Java 报错 No enclosing instance of type B is accessible. Must qualify the allocation with an enclosin

Title： Java 报错 No enclosing instance of type B is accessible. Must qualify the allocation with an enclosing

前言

在写 Java 并发的 Demo ，写的时候发现了一个报错： Java 出现 No enclosing instance of type TestB is accessible. Must qualify the allocation with an enclosing instance of type TestB(e.g. x.new A() where is an instance of TestB)
主要是我基础不好，这里通过网上查询发现了问题所在，这里就记录一下，先看代码：

public class TestB {public class ThreadA  {}public static void main(String[] args) {ThreadA teata = new ThreadA();}
}

这里我偷懒，声明了内部类，然后在主程序 public static main 中调用，类的静态方法不能直接调用动态方法。

解决办法一

内部类改为静态的

public class TestB {public static class ThreadA {		}public static void main(String[] args) {ThreadA teata = new ThreadA();}
}

解决办法二

不用内部类

public class TestB{public static void main(String[] args) {TestB teata = new TestB();}
}