java實(shí)驗(yàn)報(bào)告題目六異常處理機(jī)制

實(shí)驗(yàn)日期：2014年12月12日

實(shí)驗(yàn)題目六：異常處理機(jī)制

實(shí)驗(yàn)?zāi)康呐c內(nèi)容：掌握異常處理及自定義異常類。

實(shí)驗(yàn)步驟或程序：矩形異常判斷類

publicclassRectangleextendsGeometricObject{

privatedoublewidth,height;

publicRectangle(){

super();

}

publicRectangle(doublewidth,doubleheight)throwsException{

if(height>0&&width>0)

{

this.width=width;this.height=height;

}

else{thrownewException("輸入的寬和高不符合要求，請(qǐng)重新輸入");}

}

publicdoublegetWidth(doublewidth){

returnwidth;

}

publicvoidsetWidth(doublewidth){

this.width=width;

}

publicdoublegetHeight(doubleheight){

returnheight;

}

publicvoidsetHeight(doubleheight){

this.height=height;

}

publicdoublegetArea(){

returnwidth*height;

}

publicdoublegetPerimeter(){

return2*(width+height);

}

}

附注（續(xù)）

圓形異常判斷類

publicclassCircleextendsGeometricObjectimplementsComparable{

privatedoubleradius;

publicCircle(){

super();

}

publicdoublegetRadius(doubleradius){

returnradius;

}

publicvoidsetRadius(doubleradius){

this.radius=radius;

}

publicCircle(doubleradius)throwsException{

if(radius>0){

this.radius=radius;

}

else{

thrownewException();

}

}

publicdoublegetArea(){

附注（續(xù)）

returnradius*radius*Math.PI;

}

publicdoublegetPerimeter(){

return2*Math.PI*radius;

}

publicintcompareTo(Objectarg0){

intcount;

if(arg0instanceofGeometricObject)

{

GeometricObjectgo=(GeometricObject)arg0;

if(getArea()==go.getArea())

{

count=0;

}

/*elseif(getArea()>go.getArea())

{

count=-1;

}*/

else

{

count=-1;

}

}

else

{

count=-2;

}

returncount;

}

publicstaticvoidmain(String[]args)throwsException{

try{

Circlego1=newCircle(8);Circlego2=newCircle(1);

intc= pareTo(go1);System.out.println(+c);

}

catch(RuntimeExceptionex){System.out.println("Exception");

}

catch(Exceptionex){System.out.println("Exception");

}

}

}

產(chǎn)生異常的主函數(shù)

publicclassTest{

publicstaticvoidmain(String[]args)throwsException{

try{

GeometricObjectr=newRectangle(10,20);GeometricObjectt=newTriangle(10,20,15);GeometricObjecto=newOctagon(10);GeometricObjectc=newCircle(-31);System.out.println("矩形的面積是:"+r.getArea());System.out.println("矩形的面積是:"+r.getPerimeter());

System.out.println("圓形的面積是:"+c.getArea());

System.out.println("圓形的面積是:"+c.getPerimeter());System.out.println("三角形的面積是:"+t.getArea());System.out.println("三角形的面積是:"+t.getPerimeter());System.out.println("八邊形的面積是:"+o.getArea());System.out.println("八邊形的面積是:"+o.getPerimeter());GeometricObject[]a={r,t,o,c};

doublesum=sumArea(a);

doublesum1=sumPerimeter(a);

System.out.println("所有圖形的面積之和是："+sumArea(a));System.out.println("所有圖形的周長之和是："+sumPerimeter(a));

}

catch(RuntimeExceptionex){System.out.println("Exception");

}

catch(Exceptionex){System.out.println("Exception");

}

}

publicstaticdoublesumArea(GeometricObject[]a){

doublesum=0;

for(inti=0;i<a.length;i++){sum+=a[i].getArea();

}

returnsum;

}

publicstaticdoublesumPerimeter(GeometricObject