
//接口
public interface Shape{
public abstract double getPeremeter();
public abstract double getArea();
}
//矩形类
public class MyRect implements Shape{
private double width = 0; //宽
private double height = 0;//长
private double arc = 0;//对角线
public MyRect(double width, double height){
thiswidth = width;
thisheight = height;
}
@Override
public double getPeremeter(){
return (width + height) 2;
}
@Override
public double getArea(){
return width height;
}
public void show(){
arc = Mathsqrt((width width) + (height height))
Systemoutprintln("长:"+ height + " 宽:" + width + " 面积:" + getArea() + " 对角线:" + arc);
}
}
public class test{
public static void main(String [] args){
MyRect myRect = new MyRect(20, 30);
Systemoutprintln("周长:" + myRectgetPeremeter());
Systemoutprintln("面积:" + myRectgetArea());
myRectshow();
}
}
1、package nettest;
public class TestArray
{
int a[]={12,34,5,7,9,10};
public int max()
{
int j = a[1];
for(int i :a)
{
if(i > j)
{
j = i ;
}
}
return j;
}
public long avrage()
{
long j = 0l;
for(int i :a)
{
j = j + i;
}
return j/alength;
}
}
2、package nettest;
public class Person
{
String name;
int age;
Person(String name,int age)
{
thisname = name;
thisage = age;
}
public void printInfo()
{
Systemoutprintln("name = "+thisname+" age = "+thisage);
}
}
package nettest;
public class Student extends Person
{
String studentId;
Student(String name, int age)
{
super(name, age);
}
Student(String name, int age,String studentId)
{
super(name, age);
thisstudentId = studentId;
}
public void printInfo()
{
Systemoutprintln("name = "+thisname+" age = "+thisage+" StudentId =" + thisstudentId);
}
}
3、package nettest;
public class TestPrint
{
public static void main(String[] args)
{
for (int i = 1; i<10;i++)
{
for(int j = 0; j<i;j++)
{
Systemoutprint("");
}
Systemoutprintln();
}
}
}
1 Java源程序编译后会生成一种扩展名为(class)的字节码文件。
2 Java小程序不能单独运行,必须将编译后的文件嵌入到网页中,将其嵌
入时使用的标记是(applet)标记。
3若希望所有的控件在界面上从左至右排列,应采用(FlowLayout)布局,
设置布局调用的方法是(setLayout)。
4若类中定义的成员变量只能被同一个包中的类访问,则该变量的访问修饰符为(protected)。
5 Java通过(接口)实现多重继承。
6 如果有一个类A是B的子类,且能够被不同包中的类所使用,请写出
该类的声明头:(public class A extends B)。
7 InputStream类以(字节)为信息的基本单位。
8 自定义异常类必须是(Exception)类及子类,主动抛出异常的关
键字是(throw)。
9 java中下拉列表框对象的事件处理中,用addItemListener()方法注册监听对象,监听类实现的接口是(ItemListener)。
三、程序填空题
1 下面程序中定义了一个Car类,要求创建一个该类的对象demoCar,该对象调
用set_number方法设置车号属性为3388,调用该对象的show_number方法则
输出车号。将程序补充完整。
class Car
{ int car_number;
void set_number(int car_number)
{ thiscar_number = car_number; }
void show_number()
{ Systemoutprintln(“My car No is :”+car_number); }
}
class CarDemo
{ public static void main(String args[])
{ Car car = new Car();
demoCarset_number(3388);
carshow_number(); }}
2以下是一个applet的完整程序,它使用“宋体”字体,在applet窗口中显
示背景色为黑色,前景色为绿色的字符串“您好!”。
import javaawt;
import javaappletApplet;
public class DrawStringDemo extends Applet {
private Font afont= new Font(“宋体”,FontBOLD,18);
public void init(){
(Colorblack);
}
public void paint(Graphics g){
gsetColor(ColorGREEN);
(afont);
(“您好!”,10,40);
}
}
3程序改错。
①public static void main(String[] args) {
②boolean isValid = false;
③int scores[] = {65,70,69,98,86};
四、分析程序结果题
结果:
a=1
b=1
c=1
a=2
b=2
c=1
a=3
b=1
c=1
a=4
b=2
c=1
应该不会有问题,有问题PM我把。
3, 文件名:Threejava
public class Three {
public static void main(String[] args) {
Student stu = new Student("Zhang San", true, (short)12);
Systemoutprintln("Student name: " + stuname);
Systemoutprintln("Student is a male: " + stusex);
Systemoutprintln("Student's age: " + stuage);
stuwork();
stustudy();
Teacher teacher = new Teacher();
teacherlearnMoney();
}
}
abstract class Person{//抽象类Person
protected String name;
protected boolean sex;
protected short age;
protected abstract void work(); //work抽象方法
}
interface Learnmoney{//Learnmoney接口
public void learnMoney();
}
interface Study{//Study接口
public void study();
}
class Student extends Person implements Study{//Student类
public void work() {
Systemoutprintln("学生的工作是努力学习");
}
public Student(String name, boolean sex, short age){
supername = name;
supersex = sex;
superage = age;
}
public void study() {
Systemoutprintln("学生正在学习");
}
}
class Teacher extends Person implements Learnmoney{
public void work() {
Systemoutprintln("教师的工作是教书育人");;
}
public void learnMoney() {
Systemoutprintln("教师正在赚钱");
}
}
class Docotor extends Person implements Learnmoney{
public void work() {
Systemoutprintln("医生的职责是救死扶伤");
}
public void learnMoney() {
Systemoutprintln("医生正在赚钱");
}
}
------------------------------------
4文件名:Fourjava
public class Four {
public static void main(String[] args) {
Rectangle r = new Rectangle(3, 4);
Systemoutprintln("Area is : " + rarea());
Systemoutprintln("Circle is: " + rcircle());
}
}
class Rectangle{
private double width;
private double height;
public Rectangle(double width, double height){
thiswidth = width;
thisheight = height;
}
public double circle(){//求周长
return (width + height) 2;
}
public double area(){//求面积
return width height;
}
}
--------------------
5Fivejava
public class Five {
public static void main(String[] args) {
AImpl a = new AImpl();
apaint();
}
}
interface A {
public int method1(int x);
public int method2(int x, int y);
}
class AImpl implements A{
public int method1(int x) {
return (int)Mathpow(x, 5);
}
public int method2(int x, int y) {
return x > y x: y;
}
public void paint(){
int result1 = method1(2);
int result2 = method2(2, 8);
Systemoutprintln("method1(2) = " + result1);
Systemoutprintln("method2(2, 8) = " + result2);
}
}
-----------------------------测试
method1(2) = 32
method2(2, 8) = 8
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