风扇与线性方程
Javadoc/UML
public class Fan {
public staticfinal int SLOW=1;
public staticfinal int MEDIUM=2;
public staticfinal int FAST=3;
private intspeed=SLOW; //速度
private booleanon=false; //是否打开
private doubleradius=5; //半径
private Stringcolor="bule"; //颜色
public Fan() {
}
public intgetSpeed() {
return speed;
}
public voidsetSpeed(int speed) {
this.speed= speed;
}
public booleanisOn() {
return on;
}
public voidsetOn(boolean on) {
this.on =on;
}
public doublegetRadius() {
returnradius;
}
public voidsetRadius(double radius) {
this.radius= radius;
}
public StringgetColor() {
returncolor;
}
public voidsetColor(String color) {
this.color= color;
}
@Override
public StringtoString() {
if(this.on){
return"Fan [speed=" + speed + ", radius=" + radius
+", color=" + color + " , 电扇打开了.]";}
elsereturn "电扇没有打开."+"Fan [ radius=" + radius
+", color=" + color + "]";
}
}
package gkm;
public class TestFan {
public staticvoid main(String[] args) {
// TODOAuto-generated method stub
Fanfan1=new Fan();
fan1.setSpeed(Fan.FAST);
fan1.setColor("黄色");
fan1.setRadius(10);
fan1.setOn(true);
Fanfan2=new Fan();
System.out.println(fan1);
}
}
（2）线性方程
package gkm
public class LinearEquation {
private doublea;
private doubleb;
private doublec;
private doubled;
private doublee;
private doublef;
publicLinearEquation(double a, double b,double c,double d,double e,double f){
this.a =a;
this.b =b;
this.c =c;
this.d =d;
this.e =e;
this.f =f;
}
public doublegetA() {
return a;
}
public voidsetA(double a) {
this.a =a;
}
public doublegetB() {
return b;
}
public voidsetB(double b) {
this.b =b;
}
public doublegetC() {
return c;
}
public voidsetC(double c) {
this.c =c;
}
public doublegetD() {
return d;
}
public voidsetD(double d) {
this.d =d;
}
public doublegetE() {
return e;
}
public voidsetE(double e) {
this.e =e;
}
public doublegetF() {
return f;
}
public voidsetF(double f) {
this.f =f;
}
public booleanisSolvable(){
if((a*d-b*c)!=0)return true;
elsereturn false;
}
public doublegetx(){
if(isSolvable())
return(e*d-b*f)/(a*d-b*c);
elsereturn 0;
}
public doublegety(){
if(isSolvable())
return(a*f-e*c)/(a*d-b*c);
elsereturn 0;
}
@Override
public StringtoString() {
if(this.isSolvable())
return"线性方程的解是X="+getx()+",Y="+gety();
elsereturn "线性方程无解";
}
}
package gkm;
import java.util.Scanner;
public class TestLinearEquation {
public staticvoid main(String[] args) {
Scanner input=newScanner(System.in);
System.out.println("请输入线性方程的参数a,b,c,d,e,f");
inta=input.nextInt();
intb=input.nextInt();
intc=input.nextInt();
intd=input.nextInt();
inte=input.nextInt();
intf=input.nextInt();
LinearEquationIe1=new LinearEquation(a,b,c,d,e,f);
System.out.println(Ie1);
}
}
（3）二元方程
package gkm;
public class LineBy2Point {
private PointstartPoint;
private PointendPoint;
publicLineBy2Point() {
// TODOAuto-generated constructor stub
}
publicLineBy2Point(Point startPoint, Point endPoint) {
this.startPoint= startPoint;
this.endPoint= endPoint;
}
publicLineBy2Point(double x1,double y1,double x2,double y2){
this.startPoint=newPoint(x1,y1);
this.endPoint=newPoint(x2,y2);
}
public PointcomputeCrossPoint(LineBy2Point anotherline){
doublea=this.startPoint.getY()-this.endPoint.getY();
doubleb=this.endPoint.getX()-this.startPoint.getX();
doublec=anotherline.startPoint.getY()-anotherline.endPoint.getY();
doubled=anotherline.endPoint.getX()-anotherline.startPoint.getX();
doublee=this.endPoint.getX()*this.startPoint.getY()
-this.startPoint.getX()*this.endPoint.getY();
doublef=anotherline.endPoint.getX()*anotherline.startPoint.getY()
-anotherline.startPoint.getX()*anotherline.endPoint.getY();
LinearEquationIe=new LinearEquation(a,b,c,d,e,f);
if(Ie.isSolvable()){
PointcrossPoint=new Point(Ie.getx(),Ie.gety());
returncrossPoint;
}
elsereturn null;
}
}
package gkm;
import java.util.Scanner;
public class TestPoint {
public staticvoid main(String[] args) {
// TODOAuto-generated method stub
Scannerinput=new Scanner(System.in);
doublex1,x2,x3,x4,y1,y2,y3,y4;
System.out.print("请输入第一条线的起点");
x1=input.nextDouble();
y1=input.nextDouble();
System.out.print("请输入第一条线的终点");
x2=input.nextDouble();
y2=input.nextDouble();
System.out.print("请输入第二条线的起点");
x3=input.nextDouble();
y3=input.nextDouble();
System.out.print("请输入第二条线的终点");
x4=input.nextDouble();
y4=input.nextDouble();
LineBy2Pointline1=new LineBy2Point(x1,y1,x2,y2);
LineBy2Pointline2=new LineBy2Point(x3,y3,x4,y4);
PointcrossPoint=line1.computeCrossPoint(line2);
if(crossPoint!=null)
System.out.println("交点"+crossPoint);
elseSystem.out.println("两线没有交点");
}
}