题目内容
在下面程序的注释1处补充上下列()方法,会导致在编译过程中发生错误( )public class A{public static void main(String args[]){A a = new A();System.out.println(a.getNum()); //(1)}}
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如下Java源文件,编译并运行Child.java后,以下结果描述正确的是( )public class Parent1 {Parent1(String s) {System.out.println(s);}}public class Parent2 extends Parent1(Parent2() (System.out.println("Parent2");}}public class Child extends Parent2 {public static void main(String[] args) { Child child = new Child();}
分析如下所示的Java代码,则选项中的说法正确的是( )public class Parent { public String name;public Parent(String pName) { this.name = pName;}}public class Test extends Parent{public Test(String Name) { // 2 name = "hello"; // 3super("kitty"); // 4}}
关于super的说法正确的是( )
阅读下面JAVA代码片段,正确的选项是( )public class Car { String color; String motor;public Car(String color, String motor) {// 1 this.color =color; this.motor =motor;}}public class Truck extends Car {double weight;public Truck() {// 2}public Truck(String color，String motor, double weight){ // 3 super(color, motor);this.weight = weight;}public void display(){System.out.println("颜色:"+color+"\t发动机型号:"+motor+"\t载重量:"+weight);}public static void main(String[] args) {Truck truck = new Truck("红色","玉柴", 1.5); // 4 truck.display();}}
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