学步园

今天看代码，看到几个概念：内部类、局部类、成员类、静态成员类、匿名内部类；瞬间有种被搞糊涂了感觉。下面是一个小例子来对它们进行说明：

public class ClassTest{
    public static void main(String[] args) {
        ClassTest son = new ClassTest();
        
        //测试匿名类
        son.testAnonymous(new AnonymousClass() {
            @Override
            public void test() {
                System.out.println("1 -> " + this.getClass().isMemberClass());
                System.out.println("1 -> " + this.getClass().isAnonymousClass());
                System.out.println("1 -> " + this.getClass().isLocalClass());
                System.out.println("---------------------------------------");
            }
        });
        
        //测试成员类
        son.testMember();
        
        //测试静态成员类
        new StaticMemberClass();
        
        //测试局部类
        class LocalClass{
            public LocalClass(){
                System.out.println("4 -> " + this.getClass().isMemberClass());
                System.out.println("4 -> " + this.getClass().isAnonymousClass());
                System.out.println("4 -> " + this.getClass().isLocalClass());
                System.out.println("---------------------------------------");
            }
        }
        new LocalClass();
    }

    private void testAnonymous(AnonymousClass inner) {
        inner.test();
    }
    
    private void testMember() {
        new MemberClass();
    }
    
    /**
     * 接口，用于测试内部类
     * @author xinghzhang
     *
     */
    interface AnonymousClass{
        public void test();
    }
    
    /**
     * 静态成员类
     * @author xinghzhang
     *
     */
    static class StaticMemberClass{
        public StaticMemberClass() {
            System.out.println("3 -> " + this.getClass().isMemberClass());
            System.out.println("3 -> " + this.getClass().isAnonymousClass());
            System.out.println("3 -> " + this.getClass().isLocalClass());
            System.out.println("---------------------------------------");
        }
    }
    /**
     * 成员类
     * @author xinghzhang
     *
     */
    class MemberClass{
        public MemberClass() {
            System.out.println("2 -> " + this.getClass().isMemberClass());
            System.out.println("2 -> " + this.getClass().isAnonymousClass());
            System.out.println("2 -> " + this.getClass().isLocalClass());
            System.out.println("---------------------------------------");
        }
    }
}