以下程序的输出结果为class Parent { String one, two; public Parent(String

1.class Parent { String one, two; public Parent(StringA, String b){ one = a; two = b; } public void print(　　){ System.out.println(　　); } } public class Child extends Parent { public Child(StringA, String b){ super(　　); } public void print(　　){ System.out.println(one + " to " + two); } public static void main(String args]){ Parent p = new Parent("south", "north"); Parent t = new Child("east", "west"); p.print(); t.print(); } }运行结果 southEast to west

2.给定Java代码如下所示，则编译运行后，输出结果是（）。Class Parent {Public void count() {System.out.println(10%;}}Public class Child extends Parent{Public void count() {System.out.println(10/;}Public static void main(String args]) {Parent p = new Child();P.count();}} 选项： A:1 B: 1.0 C: 3 D:3.3333333333333335

3.[单选题]给出下面代码： 1: class Parent { 2: private String name; 3: public Parent(){} 4: } 5: public class Child extends Parent { 6:private String department; 7:public Child() {} 8: public String getValue(){ return name; } 9: public static void main(String arg[]) { 10: Parent p = new Parent(); 11: } 12: } 那些行将引起错误？ ( ) A 第3行 B 第6行 C 第7行 D 第8行

4.给定Java 代码如下所示，则编译运行后，输出结果是( )。 class Parent{ public void count(){ System. out. println(10%3); } } public class Child extends Parent{ public void count(){ System. out. println(10/3); } public static void main(String]arge){ Parent p=new Child(); p. count(); } } 选项： A:1 B:1 C:3 D:3.33333333333335

5.被顺序调用?请选择输出结果 ( )class People { String name; public People() { System.out.print(1); } public People(String name) { System.out.print(2); this.name = name; } } class Child extends People { People father; public Child(String name) { System.out.print(3); this.name = name; father = new People(name + ":F"); } public Child(){ System.out.print(4); } }public class Test{ public static void main(String[] args){ People p = new Child("梅西"); }}

6.class Parent{ int a=1; static int b=3; public void test(){System.out.println(“我是parent的test……”);} public Parent(){ System.out.println(“Parent的构造方法”); } static{[br][/br] System.out.println(“Parent的staticcode block”); } {[br][/br] System.out.println(“Parent的对象的codeblock”); } } class Child extends Parent{ int a = 2; static int b=4; public void test(){ System.out.println(“我是Child的test……”); } public Child(){ System.out.println(“Child的构造方法”); } static{System.out.println(“Parent的staticcode block”);} {System.out.println(“Parent的对象的codeblock”);} } 输出结果是？

7.47．以下代码运行输出是（） public class Person{ private String name=”Person”; int age=0; } public class Child extends Person{ public String grade; public static void main(String] args){ Person p = new Child(); System.out.println(p.name); } } A) 输出：Person B) 没有输出 C) 编译出错 D) 运行出错

8.被顺序调用, 请选择输出结果 ( )class People { String name; public People() { System.out.print(1); } public People(String name) { System.out.print(2); this.name = name; } } class Child extends People { People father; public Child(String name) { System.out.print(3); this.name = name; father = new People(name + ":F"); } public Child(){ System.out.print(4); } }public class Test{ public static void main(String[] args){ People p = new Child("梅西"); }} 选项：312|32|432|132

9.下列程序执行结果是：（） class People { String name; public People() { System.out.print(1); } public People(String name) { System.out.print(2); this.name = name; }}public class Child extends People { People father; public Child(String name) { System.out.print(3); this.name = name; father = new People(name + ":F"); } public Child() { System.out.print(4); } public static void main(String[] args) { new Child("Alice"); } }选项： A:32; B:132; C:123; D:1234

10.根据以下程序可以判断选项（）没有语法错误。public class Person{ public Person(int id, String name)throws Exception{}}class MyException extends Exception{}选项： A:public class Test{public static void main(String[] args){System.out.println(new Person(20, “John”));}} B:public class Test{public static void main(String[] args){System.out.println(new Person(20, “John”).toString());}} C:public class Test{public static void main(String[] args)throws Exception{System.out.println(new Person(20, “John”).toString());}} D:public class Test{public static void main(String[] args)throws MyException{System.out.println(new Person(20, “John”).toString());}}

11.以下代码运行输出的是class Person{ private String name = "Person"; int age=0;}public class Child extends Person{ public String grade; public static void main(String[] args){ Person p = new Child(); System.out.println(p.name); }}选项： A:Person; B:没有输出; C:编译出错; D:运行出错

12.编译运行如下 Java代码，输出结果是。class Base {public void method(){System.out.print ("Base method");}}class Child extends Base{public void methodB(){System.out.print ("Child methodB");}}class Sample {public static void main(String[] args) {Base base= new Child();base.methodB();}}

13.下列哪个声明是正确的覆盖了父类的change方法？（） public class Parent { public void change(int x) { } } public class Child extends Parent { // 覆盖父类change方法 } protected void change(int x) {} public void change(int x, int y) {} public void change(int x) {} public void change(String s) {} 选项：A、protected void change(int x) {}B、public void change(int x, int y) {}C、C.public void change(int x) {}D、D.public void change(String s) {}

14.以下程序的运行结果为( ）。public class Main { public static void change(String str) { str = "Five-" + str; } public static void main(String[] args) { String s = new String("Flower"); change(s); System.out.println(s); }}

15.编译运行如下JAVA代码,输入结果是().Class Base {public void method(){System.out.print(“Base method”);}}Class Child extends Base {public void method(){System.out.print(“Child method”);}}Class Sample {public static void main (String[]args){Base base =new Child()Base.method();}}

16.智慧职教: 下列代码的运行结果为：（）父类：public class Animal{public void show(){System.out.println("我是动物"); }}子类:public class Tiger extends Animal{public void show(){System.out.println("我是老虎"); }}子类:public class Cat extends Animal{public void show(){System.out.println("我是加菲猫"); }}public class test {public static void main(String[] args) {Animal one=new Animal();one.show();Animal two=new Tiger();two.show();Animal three=new Cat();three.show();}}

17.以下程序的运行结果是（） class Base { protected String var = "父类变量"; public static void staticMethod() { System.out.println("父类静态方法"); } } class Sub extends Base { public String var="子类变量"; public static void staticMethod() { System.out.println("子类静态方法"); } } public class Test { public static void main(String[] args) { System.out.println(new Sub().var); Base b = new Sub(); b. staticMethod() } }

18.public class Outer {public String name="Outer";private class Inner {String name="inner";void showName(){System.out.println(name);}}public static void main(String[]args){Inner inner =new Outer().new Inner();System.out.println(inner.name);}}

19.阅读下列程序，并给出程序运行的结果。Public class PolymorphismDemo {Public static void main(String] args) { m(new GraduateStudent()); m(new Student()); m(new Person());} Public static void m(Object x) {System.out.println(x.toString());}} Class GraduateStudent extends Student {} Class Student extends Person {Public String toString() { return "I am a student";}} Class Person extends Object {Public String toString() { return "I am a person";}}

20.下列程序的运行结果是【】。public class Test {public static void main (String args[]) {String 下列程序的运行结果是【】。public class Test {public static void main (String args[]) {String s1＝'hello!'；System.out.println (s1.toUpperCase())；}}

21.试图编译并运行如下代码时将发生什么？Class Mammal {Mammal () {System.out.println ("Four");}Public void ears () {System.out.println ("Two");}}Class Dog extends Mammal {Dog () {Super.ears ();System.out.println ("Three");}}Public class Scottie extends Dog {Public static void main (String argv ]) {System.out.println ("One");Scottie h = new Scottie ();}} 选项： A:One, Three, Two, Four B:One, Four, Three, Two C:One, Four, Two, Three D:Compile time error

22.下列程序的运行结果是（）。 public class Test { public static void test() { this.print(); } public static void print() { System.out.println("Test"); } public static void main(String args []) { test(); } }

23. 下面哪一个代码的样式最好?I:public class Test {public static void main(String[] args) { System.out.println("Welcome to Java!"); }}II:public class Test { public static void main(String[] args) { System.out.println("Welcome to Java!"); }}III:public class Test { public static void main(String[] args) { System.out.println("Welcome to Java!"); }}IV:public class Test { public static void main(String[] args) { System.out.println("Welcome to Java!"); }} 选项：A.IB.IIC.IIID.IV