java第章例题（java第章例题）

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1、java第3章例题（java第3章例题）[example3-1]exampleofparametricmethod.Writeamethodmodulethatimplementsthecalculationof1+2+3+......ThefunctionofNtermandn.Intmysum(intn){Inti,s=0;For(i=1;I

2、rsinthetwonumbers.Intmax(intx,inty){If(x>y)returnx;Elsereturny;}[case3-3]methodcallexample,calculate1+2+3+......+100sum.Importjavax.swing.*;PublicclassExample3_3{Publicstaticvoidmain(String[]args){Floatsum=mysum(100);JOptionPane.showMessageDialog(null,1+2+3+)......+100=

3、"+s";System.exit(0);}Intmysum(intn){Inti,s=0;For(I=1;I

4、main(String[]args){Floats=area(3,4);JOptionPane.showMessageDialog(null,trianglearea=+s);System.exit(0);}Staticfloatarea(intx,inth){Floats;S=(x*h)/2;Returns;}}[case3-5]theformulaforcalculatingplanespacedistanceissum,andtheprogramisrealizedbyoverloadingwithamethodname:/**

5、/samplemethodoverloadingImportjavax.swing.*;PublicclassExample3_5{Staticdoubledistance(doublex,doubley){Doubled=Math.sqrt(x*x+y*y);Returnd;}Staticdoubledistance(doublex,doubley,doublez){Doubled=Math.sqrt(x*x+y*y+z*z);Returnd;}Publicstaticvoidmain(Stringargs[]){DoubleD1=

6、distance(2,3);DoubleD2=distance(3,4,5);JOptionPane.showMessageDialog(null),"Accepttwoparameters:planedistanced=","+d1+"""+"Acceptthreeparameters:spacedistanced="+d2;System.exit(0);}}[case3-6]calculatethevolumeofcuboid./**/cuboidstructureClassBox{Doublewidth,height,dep

7、th;(Box){Width=10;Height=10;Depth=10;}Doublevolume(){Returnwidth*height*depth;}}PublicclassExample3_6{Publicstaticvoidmain(Stringargs[]){Boxbox=newBox();Doublev;V=box.volume();System.out.Println(cuboidvolume=:+V);}}[case3-7]usingthedefaultconstructionmethodtodesignaprog

8、ramforcalculatingcuboidvolume.Thedefault/*constructionmethodofcuboidclass.ClassBox{Doublewidth,height,depth;Do