【正文】 } 10．public class Xiti10 { public static void main(String args[]){ double a=0,b=0,c=0。a=12。b=24。c=(a,b)。(c)。c=(a,b)。(c)。c=(2,3)。(c)。c=()。(c)。c=()。(c)。c=()。(c)。c=(1)。(c)。c=(8)。(c)。} }習(xí)題10 1．BorderLayout布局。2．不可以。3．A,C。4．import 。import .*。import .*。import .*。public class Xiti4 { public static void main(String args[]){ ComputerFrame fr=new ComputerFrame()。(”計(jì)算的窗口“)。} } class ComputerFrame extends JFrame implements TextListener {TextArea text1,text2。int count=1。double sum=0,aver=0。public ComputerFrame(){ setLayout(new FlowLayout())。text1=new TextArea(6,20)。text2=new TextArea(6,20)。add(text1)。add(text2)。(false)。(this)。setSize(300,320)。setVisible(true)。addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ (0)。} })。validate()。}public void textValueChanged(TextEvent e){ String s=()。sum=0。aver=0。StringTokenizer fenxi=new StringTokenizer(s,” ,39。n39?！?。int n=fenx()。count=n。double a[]=new double[n]。for(int i=0。itry { a[i]=(temp)。sum=sum+a[i]。} catch(Exception ee){ count。} } aver=sum/count。(null)。(”n和:“+sum)。(”n平均值:“+aver)。} } 5．import .*。import .*。import .*。public class Xiti5 { public static void main(String args[]){ ComputerFrame fr=new ComputerFrame()。(”計(jì)算“)。} } class ComputerFrame extends Frame implements ActionListener { TextField text1,text2,text3。Button button1,button2,button3,button4。Label label。public ComputerFrame(){setLayout(new FlowLayout())。text1=new TextField(10)。text2=new TextField(10)。text3=new TextField(10)。label=new Label(” “,)。()。add(text1)。add(label)。add(text2)。add(text3)。button1=new Button(”加“)。button2=new Button(”減“)。button3=new Button(”乘“)。button4=new Button(”除“)。add(button1)。add(button2)。add(button3)。add(button4)。(this)。(this)。(this)。(this)。setSize(300,320)。setVisible(true)。addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ (0)。} })。validate()。}public void actionPerformed(ActionEvent e){ double n。if(()==button1){ double n1,n2。try{ n1=(())。n2=(())。n=n1+n2。((n))。(”+“)。} catch(NumberFormatException ee){ (”請輸入數(shù)字字符“)。} } else if(()==button2){ double n1,n2。try{ n1=(())。n2=(())。n=n1n2。((n))。(”“)。} catch(NumberFormatException ee){ (”請輸入數(shù)字字符“)。} } else if(()==button3){double n1,n2。try{ n1=(())。n2=(())。n=n1*n2。((n))。(”*“)。} catch(NumberFormatException ee){ (”請輸入數(shù)字字符“)。} } else if(()==button4){double n1,n2。try{ n1=(())。n2=(())。n=n1/n2。((n))。(”/“)。} catch(NumberFormatException ee){ (”請輸入數(shù)字字符“)。} } validate()。} } 6．import .*。import .*。import .*。public class Xiti6 {public static void main(String args[]){ new WindowPanel()。} } class Mypanel extends JPanel implements ActionListener { Button button。TextField text。Mypanel(){ button=new Button(” “)。text=new TextField(12)。add(button)。add(text)。(this)。} public void actionPerformed(ActionEvent e){ String name=()。if(()0)(name)。validate()。} } class WindowPanel extends Frame {Mypanel panel1,panel2。WindowPanel(){ panel1=new Mypanel()。panel2=new Mypanel()。()。()。add(panel1,)。add(panel2,)。setSize(300,320)。setVisible(true)。addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ (0)。} })。validate()。} } 7．, 。8．import .*。import .*。import .*。public class Xiti8 { public static void main(String args[]){MoveFrame f=new MoveFrame()。(12,12,300,300)。(true)。(”移動(dòng)“)。()。(new WindowAdapter(){public void windowClosing(WindowEvent e){ (0)。} })。} } class MoveFrame extends JFrame implements ActionListener { JButton controlButton,movedButton。public MoveFrame(){ controlButton=new JButton(”單擊我運(yùn)動(dòng)另一個(gè)按鈕“)。(this)。movedButton=new JButton()。(new Color(12,200,34))。setLayout(null)。add(controlButton)。add(movedButton)。(10,30,130,30)。(100,100,10,10)。}public void actionPerformed(ActionEvent e){ int x=().x。int y=().y。x=x+5。y=y+1。(x,y)。if(x200){ x=100。y=100。} } } 9．import .*。import .*。public class Xiti9 { public static void main(String args[]){ Win win=new Win()。} } class Win extends Frame implements KeyListener {Button b[]=new Button[8]。int x,y。Win(){ setLayout(new FlowLayout())。for(int i=0。i{ b[i]=new Button(”“+i)。b[i].addKeyListener(this)。add(b[i])。} addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){ (0)。} })。setBounds(10,10,300,300)。setVisible(true)。validate()。} public void keyPressed(KeyEvent e){int moveDistance=1。Component =(Component)()。int x=(int)().x。int y=(int)().y。Component ponent[]=()。if(()==){ y=ymoveDistance。(x,y)。Rectangle Rect=()。for(int k=0。ky=y+moveDistance。(x,y)。Rectangle Rect=()。for(int k=0。k=300)y=300。} else if(()==){ x=xmoveDistance。(x,y)。Rectangle Rect=()。for(int k=0。kelse if(()==){ x=x+moveDistance。(x,y)。Rectangle Rect=()。for(int k=0。k=300)x=300。} } public void keyTyped(KeyEvent e){} public void keyReleased(KeyEvent e){} } 習(xí)題11 1．A 2． import .*。import .*。import .*。class Dwindow extends Frame implements ActionListener {TextField inputNumber。TextArea save。Dwindow(String s){ super(s)。inputNumber=new TextField(22)。(this)。save=new TextArea(12,16)。setLayout(new FlowLayout())。add(inputNumber)。add(save)。setBounds(60,60,300,300)。setVisible(true)。validate()。addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){ (0)。} })。} public void actionPerformed(ActionEvent event){ String s=()。double n=0。try{ n=(s)。if(n1000){ int select=(this,”已經(jīng)超過1000確認(rèn)正確嗎？“,”確認(rèn)對(duì)話框“, )。if(select==){ (”n“+s)。}else{(null)。}} else {(”n“+s)。} } catch(NumberFormatException e){ (this,”您輸入了非法字符“,”警告對(duì)話框“, )。(null)。} } } public class E {public static void main(String args[]){ new Dwindow(”帶對(duì)話框的窗口“)。} } 3．參照以下例子完成 public class Xiti3 { public static void main(String args[]){ WindowColor win=new WindowColor()。(”帶顏色對(duì)話框的窗口“)。} } import .*。import .*。import .*。public class WindowColor extends JFrame implements ActionListener { JButton button。WindowColor(){ button=new JButton(”打開顏色對(duì)話框“)。(this)。setLayout(new FlowLayout())。add(button)。setBounds(60,60,300,300)。setVisible(true)。setDefaultCloseOperation()。} public void actionPerformed(ActionEvent e){ Color newColor=(this,”調(diào)色板“,())。if(newC