Java 中的静态嵌套类和非静态嵌套类

class OuterClass {
private static String msg = "GeeksForGeeks"; public static class NestedStaticClass {
public void printMessage() {
System.out.println("Message from nested static class: " + msg);
}
} public class InnerClass {
public void display() {
System.out.println("Message from non-static nested class: " + msg);
}
}
} public class Main {
public static void main(String args[]) {
OuterClass.NestedStaticClass printer = new OuterClass.NestedStaticClass();
printer.printMessage(); OuterClass outer = new OuterClass();
OuterClass.InnerClass inner = outer.new InnerClass();
inner.display(); OuterClass.InnerClass innerObject = new OuterClass().new InnerClass();
innerObject.display();
}
}

运行结果

```
Message from nested static class: GeeksForGeeks
Message from non-static nested class: GeeksForGeeks
Message from non-static nested class: GeeksForGeeks
```
public class ShadowTest {

    public int x = 0;

    class FirstLevel {

        public int x = 1;

        void methodInFirstLevel(int x) {
System.out.println("x = " + x);
System.out.println("this.x = " + this.x);
System.out.println("ShadowTest.this.x = " + ShadowTest.this.x);
}
} public static void main(String... args) {
ShadowTest st = new ShadowTest();
ShadowTest.FirstLevel fl = st.new FirstLevel();
fl.methodInFirstLevel(23);
}
}

运行结果

```
x = 23
this.x = 1
ShadowTest.this.x = 0
```

参考资料

04-15 23:53