从下面四段代码中选择出正确的代码段（）选项： A:abstract class Name {private String name;p

1.从下面四段代码中选择出正确的代码段（）选项： A:abstract class Name {private String name;public abstract boolean isStupidName(String name) {}} B:public class Something {public static void main(String[] args) {Other o = new Other();new Something().addOne(o);}public void addOne(final Other o) {o.i++;}}class Other {public int i;} C:public class Something {public int addOne(final int x) {return ++x; }} D:public class Something {void doSomething () {private String s = ̶”;int l = s.length();}}

2.从下面四段代码中选择出正确的代码段（）选项： A:public class Something {void doSomething () {private String s = ̶”;int l = s.length();}} B:public class Something {public static void main(String[] args) {Other o = new Other();new Something().addOne(o);}public void addOne(final Other o) {o.i++;}}class Other {public int i;} C:abstract class Name {private String name;public abstract boolean isStupidName(String name) {}} D:public class Something {public int addOne(final int x) {return ++x; }}

3.public class Something {public int addOne(final int x) {return x;}}这个比较明显。

4.public class Something {Public int addOne(final int x) {Return ++x;}}以上代码是否存在问题，如果存在请指出

5.Given: Interface Doable { Public void doSomething (String s); } Which two class definitions compile? (Choose two.) 选项： A: public abstract class Task implements Doable { public void doSomethingElse(String s) { } } B: public abstract class Work implements Doable { public abstract void doSomething(String s) { } public void doYourThing(Boolean b) { } } C: public class Job implements Doable { public void doSomething(Integer i) { } } D: public class Action implements Doable { public void doSomething(Integer i) { } public String doThis(Integer j) { } } E: public class Do implements Doable { public void doSomething(Integer i) { } public void doSomething(String s) { } public void doThat (String s) { } }

6.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);}}

7.在以下代码中，（）是类Teacher的方法。 public class Teacher { int age=33; private string name; public string Name { get{return name;} set{name=value;} } public void SaySomething（）{ //….. } ｝

8.在以下代码中，是类Teacher的方法。public class Teacher{int age=33;private string name;public string Name{get{return name;}set{name=value;}}public void SaySomething(){//…..}｝

9.public abstract class Shape { private int x； private int y； public abstract void draw（）； public void setAnchor（int x， int y） { this.x = x； this.y = y； } } Which two classes use the Shape class correctly？（）选项： A、 public class Circle implements Shape { private int radius； } B、 public abstract class Circle extends Shape { private int radius； } C、 public class Circle extends Shape { private int radius； public void draw（）； } D、 public abstract class Circle implements Shape { private int radius； public void draw（）； } E、 public class Circle extends Shape { private int radius；public void draw（） {/* code here */} } F、 public abstract class Circle implements Shape { private int radius；public void draw（） { / code here */ } }

10.Given:Public abstract class Shape {Private int x;Private int y;Public abstract void draw();Public void setAnchor(int x,int y){This.x=x;This.y=y;}}Which two classes use the shape class correctly? 选项： A:public class Circle implements Shape{ private int radius; } B:public abstract class Circle implements Shape{ private int radius; } C:public class Circle extends Shape{ private int radius; public void draw(); } D:public abstract class Circle implements Shape{ private int radius; public void draw(); } E:public class Circle extends Shape{ private int radius; public void draw();{/*code here*/} } F:public abstract class Circle implements Shape{ private int radius; public void draw();{/*code here*/} }

11. 以下说法正确的是 public class Person{ private int age; private String name; publicint getAge(){ return age; } public String getName(){ return name; } public void setAge(int age){ this.age = age; } public void setName(String name){ this.name = name; } public void show(){ System.out.println("姓名:"+name+",age"+age); } } public class TestPerson{ public static void main(String[] args){ Person p = new Person(); } } 选项： A、 p能调用的方法有setAge(int),getAge(),setName(String),setAge(int) B、 p是Person类的对象 C、 p能调用的方法有Person() D、 p.setName("Tom")能把p的姓名属性赋值为Tom

12.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);}}选项： A:输出：Person; B:没有输出; C:编译出错; D:运行出错

13.public class InheritThread extends Thread { private String name; public InheritThread (String name) { this.name = name; } public void run() { System.out.println("Greetings from thread name !"); } } public static void main(String args[]) { InheritThre

14.下面程序显示结果。public class Test{ public static void main(String [] args){ Student zhangsan = new Student("张三", 19, 87); Student lisi = zhangsan; lisi.display(); }}public class Student{ private String name; private int age; private double grade; public Student(String name, int age, double grade){ this.name = name; this.age = age; this.grade = grade; } public void display(){ System.out.println("姓名：" + name); }}选项： A:姓名：张三 B:姓名：李四 C:姓名：null D:姓名：

15.以下程序的调试结果为? public class Outer{ public String name = "Outer"; public static void main(String argv[]){ Inner i = new Inner(); i.showName(); } private class Inner{ String name =new String("Inner"); void showName(){ System.out.println(name); } } }

16.public abstract class Animal { public abstract void eat();}public class Cat extends Animal{ public void 【代码1】(){ System.out.println("猫吃猫粮"); }}public class Test { public static void main(String[] args) { Animal a = new 【代码2】(); a.eat(); }}

17.public abstract class Shape { private int x; private int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } 下列哪一个类是对Shape的正确引用（）。选项： A、public class Circle implements Shape { private int radius; } B、public abstract class Circle extends Shape { private int radius; } C、public class Circle extends Shape { private int radius; public void draw(); } D、public abstract class Circle implements Shape { private int radius; public void draw(); }

18.阅读以下程序public class Shape{private string comments;protected string name;public string Name{ get{ return name;} set{name = value;}}public void Draw() {}}public class Rectangle:Shape{protected int width;protected int height;public int Width{get{return width;} set{width=value;}}public int Height{get{return height;} set{height=value;}}public int ComputeArea(){}}以上Shape类中在Rectangle类中不可见的是（）选项： A、comments B、 name C、 Name D、 Draw()

19.public class OuterClass { private int x = 200; public class InnerClass { int y = 300; public int calculate() { return x + y; } } public void makeInner() { InnerClass ic = new InnerClass(); System.out.println(ic.calculate()); } public static void main(String[] args) { OuterClass outer = new OuterClass(); OuterClass.InnerClass inner = 【1】 ; System.out.println(inner.calculate()); }}

20.（*）以下类或者接口定义中正确的是（）。选项： A:public class A { private int x; public int getX() { return x; }} B:public abstract class A {Private int x; public abstract int getX() { return x; } public abstract int aMethod();} C:public class a {Private int x;Public abstract int getX();} D:public interface interfaceA {Private int x;Public int getX() {Return x;}}

21.下面程序显示结果是( )。 public class Test{ public static void main(String [] args){ Student zhangsan = new Student("张三", 19, 87); Student lisi = zhangsan; lisi.display(); } } public class Student{ private String name; private int age; private double grade; public Student(String name, int age, double grade){ this.name = name; this.age = age; this.grade = grade; } public void display(){ System.out.println("姓名:" + name); } } 选项： A、姓名:张三 B、姓名:李四 C、姓名: D、姓名:null

22. public class OneOuterClass { private int i = 10; private int j = 20; private class OneInnerClass{ private int i= 30; public void print(){ System.out.println("Sum:i+j="+(i+j) ); } } public static void main(String[] args) { newZjOuterClass().new ZjInnerClass().print(); } } 输出结果是：