private class Base{
Base(){
int i = 100;
System.out.println(i);
}
}
public class Pri extends Base{
static int i = 200;
public static void main(String argv[]){
Pri p = new Pri();
System.out.println(i);
}
}
举一反三
- 如何能使程序调用Base类的构造方法输出"base constructor"; class Base{ Base(int i){ System.out.println("base constructor"); } Base(){ } } public class Sup extends Base{ public static void main(String argv[]){ Sup s= new Sup(); //One } Sup() { //Two } public void derived() { //Three } }
- 选择下面程序运行的结果，并说明原因class Base{Base(){System.out.println("Base");}}public class Checket extends Base{Checket(){System.out.println("Checket");super();}public static void main(String[] arg){Checket c = new Checket();}}
- 以下代码调试结果 class Base {} class Sub extends Base {} public class CEx{ public static void main(String argv[]){ Base b = new Base(); Sub s = (Sub) b; } }
- 以下程序的编译和运行结果为？ abstract class Base{ abstract public void myfunc(); public void another(){ System.out.println("Another method"); } } public class Abs extends Base{ public static void main(String argv[]){ Abs a = new Abs(); a.amethod(); } public void myfunc(){ System.out.println("My Func"); } public void amethod(){ myfunc(); } }
- 对于一下程序，其运行结果为 class Base{ public Base(){ System.out.print("C"); } } class Base2 extends Base{ public Base2(){ System.out.print("B"); } } public class TestDemo extends Base2{ int m=1; public TestDemo(){ System.out.println("A"); } public static void main(String args[]){ TestDemo t = new TestDemo(); } }
内容
- 0
以下程序编译和运行会发生什么public class Q8 {int i = 20;static { int i = 10; }public static void main(String[] args) {Q8 a = new Q8();System.out.println(a.i);}}
- 1
给出以下代码，请问插入以下哪些语句可以使程序编译通过？（ ）class Base{public Base(int i){}}public class Example extend Base{public static void main (String arg[]){Example e = new Example(10);}Example(int i){Super(i);}Exanple(String s, int i){this(i);//插入代码处}}请选择一个正确答案： A: Example d = new Example(); B: Super(); C: This(“Hello”,10); D: Base b = ne Base(10);
- 2
下列代码的执行结果是 。public class Test {public int aMethod(){static int i=0;i++;System.out.println(i);}public static void main(String args[ ]){Test test = new Test();test.aMethod();}}
- 3
对于下列代码，下列哪个叙述是正确的？ class A { public int i=0; A(int m) { i = 1; } } public class B extends A { B(int m) { i = 2; } public static void main(String args[]){ B b = new B(100); System.out.println(b.i); //【代码】 } }
- 4
中国大学MOOC: 下列代码中构造方法的返回类型是（）public class Village { Village () { System .out .println(“hiding in Village”) ; } public static void main( String args [ ]) { Village c =new Village ( ) ;}class Village { public static void main( String args [ ]) { Village c =new Village ( ) ; } Village () { System .out .println(“hiding in Village”) ; } }