Java面向对象经典案例10个#(精选.)

Point p1=new Point();
System.out.println("利用对象调用");
System.out.println("x="+p1.x);
System.out.println("y="+p1.y);
Point p2=new Point();
p2.y=3;
System.out.println("对象p1中y的值"+"y="+p1.y);
System.out.println(c);
}
void crySpeak(String s)
{
System.out.println("**"+s+"**");
}
}
public class Monkey
{
blic static void main(String args[])
{
Anthropoid monkey=new People();
int arr[] = new int[10];
for(int i = 0;i<arr.length;i++){
arr[i] = i+10;
}
int sub[] = arrex.subarray(arr,2,6);
for(int temp:sub){
System.out.println(temp);
}
public class UseStatic{
public static void main(String args[]){
System.out.println("利用类调用静态变量");
System.out.println("x="+Point.x);
//System.out.println("y="+Point.y);
}
}
}
5
class Box{
int length;
int width;
int height;
void set(int len,int wid,int hei){
length = len;
width = wid;
height = hei;
}
}
class ShowBox{
void show(Box b){
System.out.println(b.length+" "+b.width+" "+b.height);
}
}
class TestTwo{
public static void main(String args[]){
Box a = new Box();
a.set(3,4,5);
ShowBox sbox = new ShowBox();
System.out.println("立方体的面积："+ob.area(2.0,3.0,4.0));
}
}
3
class Animal
{
public void shout()
{
}
}
class Dog extends Animal
{
public void newDog()
{
System.out.println("Dog的新特性");
d.shout();
Test t=new Test();
t.animalshout(d);//(2)
t.animalshout(d1);
}
}
4
class ArrayEx{
public int[] subarray(int a[],int start,int end){
int subarr[] = new int[end-start];
showPoint(this);
}
}
public class UsePointThis
{
public static void main(String args[]){
Point p=new Point();
p.seeit();
}
}
10
class Point{
static int x=2;
int y=0;
for(int i=0,j=start;j<end;i++,j++){
subarr[i] = a[j];
}
return subarr;
}
}
public class Test{
public static void main(String args[]){
ArrayEx arrex = new ArrayEx();
int y;
Point(){
x=0;
y=0;
//this(1,1);
}
Point(int a,int b){
x=a;
y=b;
}
void show(){
System.out.println("x="+x+" y="+y);
}
}
public class UsePoint
{
public static void main(String args[]){
ManyArea ob=new ManyArea();
System.out.println("半径为3.0的圆的面积："+ob.area(3.0));
System.out.println("长2.0、宽3.0的面积："+ob.area(2.0,3.0));
System.out.println("长2、宽3的面积："+ob.area(2,3));
//monkey是People对象的上转型对象
//puter(10,10); //非法
monkey.crySpeak("我喜欢这个运动");
People people=(People)monkey;
//把上转型对象强制转化为子类的对象
puter(10,10);
Point p = new Point();
p.show();
}
}
9.
class Point{
private int x,y;
Point(){
x=1;
y=3;
}
void showPoint(Point t){
System.out.println("x="+t.x+" y="+t.y);
}
void seeit(){
return m+x;
}
}
class UseMystatic{
public static void main(String args[]){
Mystatic.showx();
System.out.println("add="+Mystatic.add(2));
}
}
8.
class Point
{
int x;
return len*width;
}
public double area(double len,double width,double height){
return len*width*height;
}
}
public class OverLoad{
public static void main(String args[]){
One test = new One();
test.showB();
}
}
7.
class Mystatic{
private int x=3;
public static void showx(){
System.out.println("x="+x);
}
public static int add(int m){
{
a.shout();
}
}
public class PolyEx
{
public static void main(String[] args)
{
Animal d=new Dog();//(1)
Dog d1= (Dog)d;//(3)父类对象强制转换成子类对象
d1.newDog();
//d.newDog();
1
class Anthropoid //类人猿
{
private int n=100;
void crySpeak(String s)
{
System.out.println(s);
}
}
class People extends Anthropoid
{
void computer(int a,int b)
{
int c=a*b;
}
}
2
class ManyArea{
public double area(double radius){
return Math.PI*radius*radius;
}
public double area(double len,double width){
return len*width;
}
public double area(int len,int width){