《Java语言程序设计基础篇》第10版梁勇著第十五章练习题答案.docx
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《Java语言程序设计基础篇》第10版梁勇著第十五章练习题答案
《Java语言程序设计（基础篇）》（第10版梁勇著）
第十五章练习题答案
15.1
importjavafx.application.Application;
importjavafx.geometry.Pos;
importjavafx.scene.Scene;
importjavafx.scene.control.Button;
importjavafx.scene.image.ImageView;
importjavafx.scene.layout.BorderPane;
importjavafx.scene.layout.HBox;
importjavafx.stage.Stage;
importjava.util.ArrayList;
publicclassExercise15_01extendsApplication{
@Override
//OverridethestartmethodintheApplicationclass
publicvoidstart（StageprimaryStage）{
//Therearetwowaysforshuffling.Oneistousethehintinthebook.
//Theotherwayistousethestaticshufflemethodinthejava.util.Collectionsclass.
ArrayListlist=newArrayList<>（）;
for（inti=1;i<=52;i++）{
list.add（i）;
}
java.util.Collections.shuffle（list）;
HBpxhBox=newHBox（5）;
hBox.setAlignment（Pos.CENTER）;
hBox.getChildren（）.add（
new
ImageView（
"image/card/"
+list.get（0）+
".png"））;
hBox.getChildren（）.add（
new
ImageView（
"image/card/"
+list.get
（1）+
".png"））;
hBox.getChildren（）.add（
new
ImageView（
"image/card/"
+list.get
（2）+
".png"））;
hBox.getChildren（）.add（
new
ImageView（
"image/card/"
+list.get（3）+
".png"））;
//Createabutton
ButtonbtRefresh=newButton（"Refresh"）;
btRefresh.setOnAction（e->{
java.util.Collections.shuffle（list）;
hBox.getChildren（）.clear（）;
hBox.getChildren（）.add（
newImageView（
"image/card/"
+list.get（0）+
".png"））;
hBox.getChildren（）.add（
newImageView（
"image/card/"
+list.get
（1）+
".png"））;
hBox.getChildren（）.add（
newImageView（
"image/card/"
+list.get
（2）+
".png"））;
hBox.getChildren（）.add（
newImageView（
"image/card/"
+list.get（3）+
.png"））;
}）;
newBorderPane（）;
BorderPanepane=pane.setCenter（hBox）;
pane.setBottom（btRefresh）;
BorderPane.setAlignment（btRefresh,Pos.TOP_CENTER）;
//Createasceneandplaceitinthestage
Scenescene=newScene（pane,250,150）;
primaryStage.setTitle（"Exercise15_01"）;//Setthestagetitle
primaryStage.setScene（scene）;//Placethesceneinthestage
primaryStage.show（）;//Displaythestage
}
/**
*ThemainmethodisonlyneededfortheIDEwithlimited
*JavaFXsupport.Notneededforrunningfromthecommandline.
*/
publicstaticvoidmain（String[]args）{launch（args）;
}
}
15.1附加
importimportimportimportimportimportimportimportimport
javafx.application.Application;
javafx.geometry.Pos;
javafx.scene.Scene;
javafx.scene.control.Button;
javafx.scene.layout.BorderPane;javafx.scene.layout.GridPane;javafx.scene.text.Font;
javafx.scene.text.Text;
javafx.stage.Stage;
publicclassExercise15_01ExtraextendsApplication{
privateText[][]texts=newText[10][10];
@Override//OverridethestartmethodintheApplicationclasspublicvoidstart（StageprimaryStage）{
//CreateUI
GridPanepane=newGridPane（）;
pane.setAlignment（Pos.CENTER）;
pane.setHgap（10）;
pane.setVgap（10）;
for（inti=0;i<10;i++）{
for（intj=0;j<10;j++）{
pane.add（texts[i][j]=newText（（int）（Math.random（）*2）+""）,j,i）;
}
}
ButtonbtRefresh=newButton（"Refresh"）;
BorderPaneborderPane=newBorderPane（）;
borderPane.setCenter（pane）;
borderPane.setBottom（btRefresh）;
BorderPane.setAlignment（btRefresh,Pos.CENTER）;
btRefresh.setOnAction（e->{
for（inti=0;i<10;i++）{
for（intj=0;j<10;j++）{
texts[i][j].setText（（int）（Math.random（）*2）+""）;
}
}
}）;
//Createasceneandplaceitinthestage
Scenescene=newScene（borderPane,200,350）;
primaryStage.setTitle（"Exercise15_01"）;//Settitle
primaryStage.setScene（scene）;//Placethesceneinthestage
primaryStage.show（）;//Displaythestage
}
classCellextendsText{
Cell（）{
setFont（Font.font（"TimesRoman",35））;super.setText（"H"）;
this.setOnMouseClicked（e->{
if（getText（）.equals（"H"））{setText（"T"）;
}else{setText（"H"）;
}}）;
}
}
/**
*ThemainmethodisonlyneededfortheIDEwithlimited
*JavaFXsupport.Notneededforrunningfromthecommandline.
*/
publicstaticvoidmain（String[]args）{launch（args）;
}
}
15.2
importjavafx.application.Application;
importjavafx.geometry.Pos;
importjavafx.scene.Scene;
importjavafx.scene.control.Button;
importjavafx.scene.layout.BorderPane;
importjavafx.scene.layout.StackPane;
importjavafx.scene.paint.Color;
importjavafx.scene.shape.Rectangle;
importjavafx.stage.Stage;
publicclassExercise15_02extendsApplication{privatedoubleangle=0;
@Override
//OverridethestartmethodintheApplicationclasspublicvoidstart（StageprimaryStage）{StackPanestackPane=newStackPane（）;
Rectanglerectangle=newRectangle（30,30,30,60）;
rectangle.setFill（Color.WHITE）;
rectangle.setStroke（Color.BLACK）;
stackPane.getChildren（）.add（rectangle）;
//Createabutton
ButtonbtRotate=newButton（"Rotate"）;
btRotate.setOnAction（e->{
angle+=15;
rectangle.setRotate（angle）;
}）;
BorderPanepane=newBorderPane（）;
pane.setCenter（stackPane）;
pane.setBottom（btRotate）;
BorderPane.setAlignment（btRotate,Pos.TOP_CENTER）;
//Createasceneandplaceitinthestage
Scenescene=newScene（pane,200,150）;
primaryStage.setTitle（"Exercise15_02"）;//Setthestagetitle
primaryStage.setScene（scene）;//Placethesceneinthestage
primaryStage.show（）;//Displaythestage
}
/**
*ThemainmethodisonlyneededfortheIDEwithlimited
*JavaFXsupport.Notneededforrunningfromthecommandline.
*/
publicstaticvoidmain（String[]args）{launch（args）;
}
}
15.2附加
import
javafx.application.Application;
import
javafx.geometry.Pos;
import
javafx.scene.Scene;
import
javafx.scene.control.Button;
import
javafx.scene.layout.BorderPane;
import
javafx.scene.layout.Pane;
import
javafx.scene.shape.Line;
import
javafx.stage.Stage;
public
classExercise15_02Extra
extendsApplication{
private
static
Panepane=newPane（）;
private
static
doublepaneWidth=400;
private
static
doublepaneHeight=250;
@Override//OverridethestartmethodintheApplicationclasspublicvoidstart（StageprimaryStage）{
drawARandomArrowLine（）;
ButtonbtDrawArrowLine=newButton（"Drawarandomarrowline"）;
BorderPaneborderPane=newBorderPane（）;
borderPane.setCenter（pane）;
borderPane.setBottom（btDrawArrowLine）;
BorderPane.setAlignment（btDrawArrowLine,Pos.CENTER）;
btDrawArrowLine.setOnAction（e->drawARandomArrowLine（））;
//Createasceneandplaceitinthestage
Scenescene=newScene（borderPane,400,250）;
primaryStage.setTitle（"Exercise15_02"）;//Setthestagetitle
primaryStage.setScene（scene）;//Placethesceneinthestage
primaryStage.show（）;//Displaythestage
}
privatestaticvoiddrawARandomArrowLine（）{pane.getChildren（）.clear（）;
doublex1=Math.random（）*（paneWidth-12）;
doubley1=Math.random（）*（paneHeight-12）;
doublex2=Math.random（）*（paneWidth-12）;
doubley2=Math.random（）*（paneHeight-12）;
drawArrowLine（x1,y1,x2,y2,pane）;
}
publicstaticvoiddrawArrowLine（doublex1,doubley1,doublex2,doubley2,Panepane）{
pane.getChildren（）.add（newLine（x1,y1,x2,y2））;
//findslopeofthislinedoubleslope=（（（（double）y1）-（double）y2））
/（（（double）x1）-（（（double）x2）））;
doublearctan=Math.atan（slope）;
//Thiswillflipthearrow45offofa
//perpendicularlineatptx2
doubleset45=1.57/2;
//arrowsshouldalwayspointtowardsi,noti+1
if（x1//add90degreestoarrowlinesset45=-1.57*1.5;
}
//setlengthofarrowsintarrlen=15;
//drawarrowsonline
pane.getChildren（）.add（newLine（x2,y2,（x2+（Math.cos（arctan+set45）*
arrlen））,
（（y2））+（Math.sin（arctan+set45）*arrlen）））;
pane.getChildren（）.add（newLine（x2,y2,（x2+（Math.cos（arctan-set45）*
arrlen））,
（（y2））+（Math.sin（arctan-set45）*arrlen）））;
}
/**
*ThemainmethodisonlyneededfortheIDEwithlimited
*JavaFXsupport.Notneededforrunningfromthecommandline.
*/
publicstaticvoidmain（String[]args）{launch（args）;
}
}
15.3
importjavafx.application.Application;
importjavafx.geometry.Pos;
importjavafx.scene.Scene;
importjavafx.scene.control.Button;
importjavafx.scene.layout.BorderPane;
importjavafx.scene.layout.HBox;
importjavafx.scene.layout.Pane;
importjavafx.scene.paint.Color;
importjavafx.scene.shape.Circle;
importjavafx.stage.Stage;
publicclassExercise15_03extendsApplication{
@Override
//OverridethestartmethodintheApplicationclasspublicvoidstart（StageprimaryStage）{
Panepane=newPane（）;
Circlecircle=newCircle（40,50,20）;
circle.setFill（Color.WHITE）;
circle.setStroke（Color.BLACK）;
pane.getChildren（）.add（circle）;
//Createfourbuttons
HBoxhBox=newHBox（5）;
ButtonbtLeft=
ButtonbtRight=
ButtonbtUp=
ButtonbtDown=
newButton（"Left"）;
newButton（"Right"）;
newButton（"Up"）;
newButton（"Down"）;
hBox.setAlignment（Pos.CENTER）;
hBox.getChildren（）.addAll（btLeft,btRight,btUp,btDown）;
BorderPaneborderPane=newBorderPane（）;
borderPane.setCenter（pane）;
borderPane.setBottom（hBox）;
BorderPane.setAlignment（hBox,Pos.TOP_CENTER）;
//Createasceneandplaceitinthestage
Scenescene=newScene（borderPane,200,150）;
primaryStage.setTitle（"Exercise15_03"）;//Setthestagetitle
primaryStage.setScene（scene）;//Placethesceneinthestage
primaryStage.show（）;//Displaythestage
btLeft.setOnAction（e->{circle.setCenterX（circle.getCenterX（）>0?
circle.getCenterX（）-2:
0）;
}）;
btRight.setOnAction（e->{
circle.setCenterX（circle.getCenterX（）circle.getCenterX（）+2:
0）;}）;
btUp.setOnAction（e->{circle.setCenterY（circle.getCenterY（）>0?
circle.getCenterY（）-2:
0）;
}）;
btDown.setOnAction（e->{
circle.setCenterY（circle.getCe
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