Yourparentsjustgaveyouagiftof$15,000.Youareinvestingthismoneyfor12yearsat5percentsimpleinterest.Howmuchmoneywillyouhaveattheendofthe12years?
A. $15,750
B. $16,000
C. $17,375
D. $24,000
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此题存在语法错误。如果需要保持Test类代码不变,修改程序,使得程序输出为:callmecallyou应如何修改,请将修改后的代码写在答案框中。源代码如下:abstract class A {abstract void callme();void metoo() {System.out.println("metoo");}}class B extends A {void callme() {System.out.println("callme");}void callyou(){System.out.println("callyou");}}public class Test {public static void main(String[] args) {A a = new B();a.callme();a.callyou();}}
只能修改son类代码,其他代码保持不变,要求程序输出:202.110.33.0源代码为:public class Test {public static void main(String[] args) {DerivedClass d= new son();System.out.println(d.getIp());}}abstract class BaseClass{String hostName="WUIT";abstract String getName();abstract String getIp();//设计者认为应该存在该方法}abstract class DerivedClass extends BaseClass{String ip = "202.110.33.0";String getName() {return hostName;}}class son extends DerivedClass{}
Object类型是系统类型,是所有类型的基类。Son是Object类型的派生类(子类)。要求补全代码,main方法输出运行结果为:12345class Son {int s ;int getsonValue(){return s;}Son(int i){1;}}public class Test {public static void main(String[] args) {Object[] sons = new Son[5];for (int i =0;i<5;i++){sons[i] =new Son( 2);System.out.println((( 3)sons[i]).getsonValue());}}}