【单选题】子类和父类的定义如下: class A { int v1=10; int v2=10; public A() {} public void m1() { System.out.println("A m1"); } public void m2() { System.out.println("A m2"); } } class B extends A { int v2=20; int v3=20; ...
【单选题】子类和父类的定义如下: class A { int v1=10; int v2=10; public A() {} public A(int v1) { super(); } public void m1() { System.out.println("A m1"); } public void m2() { System.out.println("A m2"); } } class B exte...