java程序设计教程部分答案3.docx
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java程序设计教程部分答案3
Pp5.15统计元音字母个数
packageStatistics_aeiou;
importjava.awt.Dimension;
importjava.awt.Toolkit;
importjavax.swing.JFrame;
publicclassStatistics{
publicstaticvoidmain（String[]args）{
JFrameframe=newJFrame（"元音字母统计柱状图"）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.setSize（500,500）;
DimensionscreenSize=Toolkit.getDefaultToolkit（）.getScreenSize（）;
intx=（screenSize.width-frame.getWidth（））/2;
inty=（screenSize.height-frame.getHeight（））/2;
frame.setLocation（x,y）;
AeiouPanelpanel=newAeiouPanel（）;
frame.getContentPane（）.add（panel）;
frame.pack（）;
frame.setVisible（true）;
}
}
packageStatistics_aeiou;
importjava.awt.BorderLayout;
importjava.awt.Color;
importjava.awt.Component;
importjava.awt.Dimension;
importjava.awt.FlowLayout;
importjava.awt.Graphics;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjavax.swing.Box;
importjavax.swing.BoxLayout;
importjavax.swing.JButton;
importjavax.swing.JLabel;
importjavax.swing.JPanel;
importjavax.swing.JTextField;
publicclassAeiouPanelextendsJPanel{
privateJLabelinput,label1,label2,label3,label4,label5,label6;
privateJTextFieldtext;
privateJButtonsure,exit;
privateJPanelpanel,panel1;
privatefinalintN=60,WITH=30;
publicAeiouPanel（）{
input=newJLabel（"InputCharacter:
"）;
text=newJTextField（15）;
sure=newJButton（"确定"）;
exit=newJButton（"退出"）;
panel=newJPanel（）;
panel1=newJPanel（）;
label1=newJLabel（"a:
"）;
label2=newJLabel（"e:
"）;
label3=newJLabel（"i:
"）;
label4=newJLabel（"o:
"）;
label5=newJLabel（"u:
"）;
label6=newJLabel（"其它字符:
"）;
AeiouListenerlistener=newAeiouListener（）;
sure.addActionListener（listener）;
exit.addActionListener（listener）;
panel.setLayout（newFlowLayout（））;
panel.setBackground（Color.cyan）;
panel.add（input）;
panel.add（text）;
panel.add（sure）;
panel.add（exit）;
panel1.setLayout（newBoxLayout（panel1,BoxLayout.Y_AXIS））;
panel1.setBackground（Color.cyan）;
panel1.add（label1）;
panel1.add（Box.createRigidArea（newDimension（0,20）））;
panel1.add（label2）;
panel1.add（Box.createRigidArea（newDimension（0,20）））;
panel1.add（label3）;
panel1.add（Box.createRigidArea（newDimension（0,20）））;
panel1.add（label4）;
panel1.add（Box.createRigidArea（newDimension（0,20）））;
panel1.add（label5）;
panel1.add（Box.createRigidArea（newDimension（0,20）））;
panel1.add（label6）;
setLayout（newBorderLayout（））;
add（panel,BorderLayout.NORTH）;
add（panel1,BorderLayout.EAST）;
setBackground（Color.cyan）;
setPreferredSize（newDimension（500,500））;
}
privateclassAeiouListenerimplementsActionListener{
publicvoidactionPerformed（ActionEvente）{
if（e.getSource（）==sure）
repaint（）;
if（e.getSource（）==exit）{
System.exit（0）;
}
}
}
publicvoidpaintComponent（Graphicspage）{
super.paintComponent（page）;
Stringa=text.getText（）;
intj=0,l=0,m=0,n=0,k=0,p=0;
for（inti=0;iswitch（a.charAt（i））{
case'a':
j++;break;
case'e':
l++;break;
case'i':
m++;break;
case'o':
n++;break;
case'u':
p++;break;
default:
k++;
}
label1.setText（"a:
"+j）;
label2.setText（"e:
"+l）;
label3.setText（"i:
"+m）;
label4.setText（"o:
"+n）;
label5.setText（"u:
"+p）;
label6.setText（"其它字符:
"+k）;
}
intx=50,y=50,x1=75;
page.setColor（Color.black）;
page.drawLine（x,400,450,400）;
page.setColor（Color.black）;
page.drawLine（x,y,x,400）;
page.setColor（Color.red）;
page.fillRect（x1,400-10*j,WITH,10*j）;
page.setColor（Color.blue）;
page.fillRect（x1+N,400-10*l,WITH,10*l）;
page.setColor（Color.green）;
page.fillRect（x1+2*N,400-10*m,WITH,10*m）;
page.setColor（Color.yellow）;
page.fillRect（x1+3*N,400-10*n,WITH,10*n）;
page.setColor（Color.gray）;
page.fillRect（x1+4*N,400-10*p,WITH,10*p）;
page.setColor（Color.pink）;
page.fillRect（x1+5*N,400-10*k,WITH,10*k）;
}
}
运行界面截图：
输入前界面：
输入后界面：
Pp5.22画100个随机圆。
packageDrawCircle;
importjava.awt.Dimension;
importjava.awt.Toolkit;
importjavax.swing.JFrame;
publicclassDrawCircle{
publicstaticvoidmain（String[]args）{
JFrameframe=newJFrame（"Circles"）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.setSize（350,375）;
DimensionscreenSize=Toolkit.getDefaultToolkit（）.getScreenSize（）;
intx=（screenSize.width-frame.getWidth（））/2;
inty=（screenSize.height-frame.getHeight（））/2;
frame.setLocation（x,y）;
CirclePanelpanel=newCirclePanel（）;
frame.getContentPane（）.add（panel）;
frame.pack（）;
frame.setVisible（true）;
}
}
packageDrawCircle;
importjava.awt.BorderLayout;
importjava.awt.Color;
importjava.awt.Dimension;
importjava.awt.Graphics;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjava.util.Random;
importjavax.swing.Box;
importjavax.swing.BoxLayout;
importjavax.swing.JButton;
importjavax.swing.JPanel;
importDrawCircle1.CirclePanel1.CircleListner;
publicclassCirclePanelextendsJPanel{
privatestaticfinallongserialVersionUID=1L;
privatefinalintNUMCIRCLES=100,MAXRADIOUS=100;
privatefinalintMAX_X=250,MAX_Y=250;
privateRandomgenerator;
privateJButtonagain,exit;
privateJPanelpanel;
publicCirclePanel（）{
generator=newRandom（）;
again=newJButton（"again"）;
exit=newJButton（"exit"）;
panel=newJPanel（）;
panel.setLayout（newBoxLayout（panel,BoxLayout.X_AXIS））;
panel.add（again）;
panel.add（Box.createHorizontalGlue（））;
panel.add（exit）;
panel.setBackground（Color.green）;
setLayout（newBorderLayout（））;
add（panel,BorderLayout.SOUTH）;
CircleListnerlistener=newCircleListner（）;
again.addActionListener（listener）;
exit.addActionListener（listener）;
setBackground（Color.green）;
setPreferredSize（newDimension（350,375））;
}
publicclassCircleListnerimplementsActionListener{
publicvoidactionPerformed（ActionEventevent）{
if（event.getSource（）==again）{
repaint（）;
}
if（event.getSource（）==exit）{
System.exit（0）;
}
}
}
publicvoidpaintComponent（Graphicspage）{
super.paintComponent（page）;
intx,y,radious;
for（intcount=0;countx=generator.nextInt（MAX_X）+1;
y=generator.nextInt（MAX_Y）+1;
radious=generator.nextInt（MAXRADIOUS）+1;
if（radious<=35）{
page.setColor（Color.blue）;
page.drawOval（x,y,radious,radious）;
}
else
if（radious<=70）{
page.setColor（Color.yellow）;
page.drawOval（x,y,radious,radious）;
}
else
{
page.setColor（Color.red）;
page.drawOval（x,y,radious,radious）;
}
}
}
}
运行界面截图
Pp5.29画点。
packageDrawDots;
importjava.awt.Dimension;
importjava.awt.Toolkit;
importjavax.swing.JFrame;
publicclassDrawDots{
publicstaticvoidmain（String[]args）{
JFrameframe=newJFrame（）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.setSize（500,500）;
DimensionscreenSize=Toolkit.getDefaultToolkit（）.getScreenSize（）;
intx=（screenSize.width-frame.getWidth（））/2;
inty=（screenSize.height-frame.getHeight（））/2;
frame.setLocation（x,y）;
DotPanelpanel=newDotPanel（）;
frame.getContentPane（）.add（panel）;
frame.pack（）;
frame.setVisible（true）;
}
}
packageDrawDots;
importjava.awt.BorderLayout;
importjava.awt.Color;
importjava.awt.Dimension;
importjava.awt.Graphics;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjava.util.Random;
importjavax.swing.Box;
importjavax.swing.BoxLayout;
importjavax.swing.JButton;
importjavax.swing.JPanel;
importDrawCircle1.CirclePanel1.CircleListner;
publicclassDotPanelextendsJPanel{
/**
*
*/
privatestaticfinallongserialVersionUID=1L;
privatefinalintMAXDOTS=20000,BOUNDARY=250,MAXSIDE=500,WIDTH=1;
privateRandomgenerator;
privateJButtonagain,exit;
privateJPanelpanel;
publicDotPanel（）{
generator=newRandom（）;
again=newJButton（"again"）;
exit=newJButton（"exit"）;
panel=newJPanel（）;
panel.setLayout（newBoxLayout（panel,BoxLayout.X_AXIS））;
panel.add（again）;
panel.add（Box.createHorizontalGlue（））;
panel.add（exit）;
panel.setBackground（Color.cyan）;
setLayout（newBorderLayout（））;
add（panel,BorderLayout.SOUTH）;
DotListnerlistener=newDotListner（）;
again.addActionListener（listener）;
exit.addActionListener（listener）;
setBackground（Color.cyan）;
setPreferredSize（newDimension（500,500））;
}
publicclassDotListnerimplementsActionListener{
publicvoidactionPerformed（ActionEventevent）{
if（event.getSource（）==again）{
repaint（）;
}
if（event.getSource（）==exit）{
System.exit（0）;
}
}
}
publicvoidpaintComponent（Graphicspage）{
super.paintComponent（page）;
intx,y;
for（inti=0;ix=generator.nextInt（MAXSIDE）+1;
y=generator.nextInt（MAXSIDE）+1;
if（x<=BOUNDARY）{
page.setColor（Color.red）;
page.fillRect（x,y,WIDTH,WIDTH）;
}
else
{
page.setColor（Color.green）;
page.fillRect（x,y,WIDTH,WIDTH）;
}
}
}
}
运行界面截图：
Pp5.30画10个随机圆。
packageDrawCircle1;
importjava.awt.Dimension;
importjava.awt.Toolkit;
importjavax.swing.JFrame;
publicclassDrawCircle1{
publicstaticvoidmain（String[]args）{
JFrameframe=newJFrame（"Circles"）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.setSize（350,450）;
DimensionscreenSize=Toolkit.getDefaultToolkit（）.getScreenSize（）;
intx=（screenSize.width-frame.getWidth（））/2;
inty=（screenSize.height-frame.getHeight（））/2;
frame.setLocation（x,y）;
CirclePanel1panel=newCirclePanel1（）;
frame.getContentPane（）.add（panel）;
f
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