细节问题决定一切(java小案例)

 

 

 

package txt;

public class A1 {

public void f1(){

B2 b2 = new B2();

b2.f2();

b2.fx();

}

public static void main(String[] args){

A1 a1 = new A1();

a1.f1();

}

}

class B2{

private C3 c3 = new C3();

public void f2(){

c3.f3();

}

public void fx(){

c3.f3();

c3.f4();

}

}

class C3{

public void f3(){System.out.println("C3 f3");}

public void f4(){System.out.println("C3 f4");}

}

 

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package txt;

public class A {

public void f1(){

B b = new B();

b.f2();

C c = new C();

c.f3();

c.f4();

}

public static void main(String[] args){

A a = new A();

a.f1();

}

}

class B{

public void f2(){

C c = new C();

c.f3();
}

}

class C{

public void f3(){

System.out.println("C f3");

}

public void f4(){

System.out.println("C f4");

}

}