• 2022-05-29
    给定如下代码,哪个表达是错误的?class C1 {} class C2 extends C1 { } class C3 extends C2 { } class C4 extends C1 {} C1 c1 = new C1(); C2 c2 = new C2(); C3 c3 = new C3(); C4 c4 = new C4();
    A: c1是C1的实例
    B: c2是C1的实例
    C: c3是C1的实例
    D: c4是C2的实例
    E: c4是C1的实例