《Java语言程序设计基础篇》第10版梁勇著第十六章练习题答案.docx
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《Java语言程序设计基础篇》第10版梁勇著第十六章练习题答案
Java语言程序设计（基础篇）》（第10版梁勇著）
第十六章练习题答案
16.1
importjavafx.application.Application;
importjavafx.geometry.Pos;
importjavafx.scene.Scene;
importjavafx.scene.control.Button;
importjavafx.scene.control.RadioButton;
importjavafx.scene.control.ToggleGroup;
importjavafx.scene.layout.BorderPane;
importjavafx.scene.layout.HBox;
importjavafx.scene.layout.Pane;
importjavafx.scene.paint.Color;
importjavafx.scene.text.Font;
importjavafx.scene.text.Text;
importjavafx.stage.Stage;
extendsApplication{
publicclassExercise16_01
privatedoublepaneWidth=500;
privatedoublepaneHeight=150;
@Override//OverridethestartmethodintheApplicationclasspublicvoidstart（StageprimaryStage）{
Texttext=newText（20,40,"Programmingisfun"）;
text.setFont（newFont（"Times",20））;
PanepaneForText=newPane（）;
paneForText.getChildren（）.add（text）;
paneForText.setStyle（"-fx-border-color:
gray"）;
newRadioButton（"Red"）;
newRadioButton（"Green"）;
ToggleGroupgroup=newToggleGroup（）;
rbRed.setToggleGroup（group）;rbYellow.setToggleGroup（group）;rbBlack.setToggleGroup（group）;rbBlack.setSelected（true）;rbOrange.setToggleGroup（group）;
rbGreen.setToggleGroup（group）;
HBoxhBox=newHBox（5）;
hBox.getChildren（）.addAll（rbRed,rbYellow,rbBlack,rbOrange,rbGreen）;hBox.setAlignment（Pos.CENTER）;
ButtonbtLeft=newButton（"<="）;
ButtonbtRight=newButton（"=>"）;
HBoxhBoxForButtons=newHBox（5）;
hBoxForButtons.getChildren（）.addAll（btLeft,btRight）;hBoxForButtons.setAlignment（Pos.CENTER）;
BorderPaneborderPane=newBorderPane（）;
borderPane.setTop（hBox）;
borderPane.setCenter（paneForText）;borderPane.setBottom（hBoxForButtons）;
//Createasceneandplaceitinthestage
Scenescene=newScene（borderPane,paneWidth,paneHeight+40）;
primaryStage.setTitle（"Exercise16_01"）;//SetthestagetitleprimaryStage.setScene（scene）;//PlacethesceneinthestageprimaryStage.show（）;//Displaythestage
rbRed.setOnAction（e->text.setStroke（Color.RED））;rbYellow.setOnAction（e->text.setStroke（Color.YELLOW））;
rbBlack.setOnAction（e->text.setStroke（Color.BLACK））;rbOrange.setOnAction（e->text.setStroke（Color.ORANGE））;
rbGreen.setOnAction（e->text.setStroke（Color.GREEN））;
btLeft.setOnAction（e->text.setX（text.getX（）-1））;btRight.setOnAction（e->text.setX（text.getX（）+1））;
}
/**
*ThemainmethodisonlyneededfortheIDEwithlimited
*JavaFXsupport.Notneededforrunningfromthecommandline.
*/
publicstaticvoidmain（String[]args）{
launch（args）;
}
}
16.1附加
importjavafx.application.Application;
importjavafx.scene.Scene;
importjavafx.scene.layout.*;
importjavafx.scene.paint.Color;
importjavafx.scene.control.*;
importjavafx.stage.Stage;
importjavafx.geometry.Pos;
publicclassExercise16_01ExtraextendsApplication{finalstaticdoublePANEL_WIDTH=400;
finalstaticdoublePANEL_HEIGHT=140;
@Override//OverridethestartmethodintheApplicationclass
publicvoidstart（StageprimaryStage）{
GridPanepaneForOriginal=
GridPanepaneForInversed=
newGridPane（）;newGridPane（）;
TextField[][]tfOriginal=
TextField[][]tfInversed=
newTextField[3][3];
newTextField[3][3];
for（inti=0;i<3;i++）{for（intj=0;j<3;j++）{paneForOriginal.add（tfOriginal[i][j]=tfOriginal[i][j].setPrefColumnCount（4）;paneForInversed.add（tfInversed[i][j]=tfInversed[i][j].setPrefColumnCount（4）;
}
}
newTextField（）,j,i）;
newTextField（）,j,i）;
BorderPanep1=newBorderPane（）;
p1.setCenter（paneForOriginal）;p1.setTop（newLabel（"OriginalMatrix"））;
BorderPanep2=newBorderPane（）;p2.setCenter（paneForInversed）;
finalLabellblStatus=newLabel（"InversedMatrix"）;p2.setTop（lblStatus）;
HBoxhBox=newHBox（5）;hBox.getChildren（）.addAll（p1,p2）;
BorderPanepane=newBorderPane（）;pane.setCenter（hBox）;
ButtonbtGetInverse=
newButton（"GetInverse"
）;
pane.setBottom（btGetInverse）;
BorderPane.setAlignment（btGetInverse,Pos.CENTER）;
Scenescene=newScene（pane,PANEL_WIDTH,PANEL_HEIGHT）;
primaryStage.setTitle（"Exercise16_01"）;//SetthestagetitleprimaryStage.setScene（scene）;//PlacethesceneinthestageprimaryStage.show（）;//Displaythestage
btGetInverse.setOnAction（e->{
double[][]A=newdouble[3][3];
for（inti=0;i<3;i++）
for（intj=0;j<3;j++）{
A[i][j]=Double.parseDouble（tfOriginal[i][j].getText（））;
}
double[][]inverseA=Exercise08_03Extra.inverse（A）;
if（inverseA==null）
lblStatus.setText（"Inveredmatrix:
Noinversematrix"）;
else{
for（inti=0;i<3;i++）
for（intj=0;j<3;j++）{tfInversed[i][j].setText（inverseA[i][j]+""）;
}
}）;
/**
*ThemainmethodisonlyneededfortheIDEwithlimited
*JavaFXsupport.Notneededforrunningfromthecommandline.*/
publicstaticvoidmain（String[]args）{launch（args）;
}
}
16.2
importjavafx.application.Application;
importjavafx.geometry.Pos;
importjavafx.scene.Scene;
importjavafx.scene.control.CheckBox;
importjavafx.scene.control.RadioButton;importjavafx.scene.control.ToggleGroup;
importjavafx.scene.layout.BorderPane;
importjavafx.scene.layout.HBox;
importjavafx.scene.layout.StackPane;
importjavafx.scene.paint.Color;
importjavafx.scene.shape.Circle;
importjavafx.scene.shape.Ellipse;
importjavafx.scene.shape.Rectangle;
importjavafx.stage.Stage;
publicclassExercise16_02extendsApplication{privatedoublepaneWidth=500;privatedoublepaneHeight=150;
@Override//OverridethestartmethodintheApplicationclasspublicvoidstart（StageprimaryStage）{
StackPanepane=newStackPane（）;
Circlecircle=newCircle（20,20,50）;
circle.setStroke（Color.BLACK）;
circle.setFill（Color.WHITE）;
Rectanglerectangle=newRectangle（20,20,80,50）;
rectangle.setStroke（Color.BLACK）;
Ellipseellipse=newEllipse（20,20,50,70）;
ellipse.setStroke（Color.BLACK）;
pane.setStyle（"-fx-border-color:
gray"）;pane.getChildren（）.add（circle）;
newRadioButton（"Circle"）;
newRadioButton（"Rectangle"newRadioButton（"Ellipse"）;newCheckBox（"Fill"）;
ToggleGroupgroup=newToggleGroup（）;
rbCircle.setToggleGroup（group）;rbCircle.setSelected（true）;rbRectangle.setToggleGroup（group）;rbEllipse.setToggleGroup（group）;
HBoxhBox=newHBox（5）;hBox.getChildren（）.addAll（rbCircle,rbRectangle,rbEllipse,chkFill）;hBox.setAlignment（Pos.CENTER）;
newBorderPane（）;
BorderPaneborderPane=borderPane.setCenter（pane）;borderPane.setBottom（hBox）;
//Createasceneandplaceitinthestage
Scenescene=newScene（borderPane,paneWidth,paneHeight+40）;
primaryStage.setTitle（"Exercise16_02"）;//SetthestagetitleprimaryStage.setScene（scene）;//PlacethesceneinthestageprimaryStage.show（）;//Displaythestage
rbCircle.setOnAction（e->{
pane.getChildren（）.clear（）;pane.getChildren（）.add（circle）;
if（chkFill.isSelected（））{
circle.setFill（Color.BLACK）;
}
else{
circle.setFill（Color.WHITE）;
}
}）;
rbRectangle.setOnAction（e->{
pane.getChildren（）.clear（）;pane.getChildren（）.add（rectangle）;
if（chkFill.isSelected（））{
rectangle.setFill（Color.BLACK）;
}
else{
rectangle.setFill（Color.WHITE）;
}
}）;
rbEllipse.setOnAction（e->{
pane.getChildren（）.clear（）;pane.getChildren（）.add（ellipse）;
if（chkFill.isSelected（））{
ellipse.setFill（Color.BLACK）;
}
else{
ellipse.setFill（Color.WHITE）;
}
}）;
chkFill.setOnAction（e->{
if（chkFill.isSelected（））{
circle.setFill（Color.BLACK）;
rectangle.setFill（Color.BLACK）;
ellipse.setFill（Color.BLACK）;
}else{
circle.setFill（Color.WHITE）;rectangle.setFill（Color.WHITE）;
ellipse.setFill（Color.WHITE）;
}
}）;
}
/**
*ThemainmethodisonlyneededfortheIDEwithlimited
*JavaFXsupport.Notneededforrunningfromthecommandline.*/
publicstaticvoidmain（String[]args）{launch（args）;
}
}
16.2附加
import
javafx.application.Application;
import
javafx.scene.Scene;
import
javafx.scene.layout.*;
import
javafx.scene.paint.Color;
import
javafx.scene.control.*;
import
javafx.stage.Stage;
import
javafx.geometry.Pos;
public
classExercise16_02Extra
extendsApplication{
final
staticdoublePANEL_
WIDTH=400;
final
staticdoublePANEL_
HEIGHT=140;
@Override//OverridethestartmethodintheApplicationclass
publicvoidstart（StageprimaryStage）{
GridPanepaneForOriginal=
GridPanepaneForInversed=
newGridPane（）;newGridPane（）;
TextField[][]tfA=newTextField[3][3];
TextField[]tfB=newTextField[3];
for（inti=0;i<3;i++）{
for（intj=0;j<3;j++）{
tfA[i][j]=newTextField（）;
tfA[i][j].setPrefColumnCount（4）;
}
tfB[i]=newTextField（）;tfB[i].setPrefColumnCount（4）;
}
HBox[]hBoxes=newHBox[3];
for（inti=0;i<3;i++）{
hBoxes[i]=newHBox（5）;
hBoxes[i].getChildren（）.addAll（tfA[i][0],newLabel（"x"）,tfA[i][1],newLabel（"y"）,tfA[i][2],newLabel（"z="）,tfB[i]）;
}
VBoxvBox=newVBox（5）;
vBox.getChildren（）.addAll（hBoxes[0],hBoxes[1],hBoxes[2]）;
HBoxhBox=newHBox（5）;
LabellblStatus=newLabel（）;
ButtonbtSolveEquation=newButton（"SolveEquation"）;
hBox.getChildren（）.addAll（btSolveEquation,lblStatus）;
BorderPanepane=newBorderPane（）;
pane.setCenter（vBox）;pane.setBottom（hBox）;
Scenescene=newScene（pane,PANEL_WIDTH,PANEL_HEIGHT）;
primaryStage.setTitle（"Exercise16_02"）;//SetthestagetitleprimaryStage.setScene（scene）;//PlacethesceneinthestageprimaryStage.show（）;//Displaythestage
btSolveEquation.setOnAction（e->{
double[][]A=newdouble[3][3];
double[]B=newdouble[3];
for（inti=0;i<3;i++）{
for（intj=0;j<3;j++）{
A[i][j]=Double.parseDouble（tfA[i][j].getText（））;
}
B[i]=Double.parseDouble（tfB[i].getText（））;
}
double[]result=Exercise08_02Extra.getSolution（A,B）;
if（result==
null）
lblStatus.setText（
"Nosolutions"）;
else
lblStatus.set
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