Java答案[1].doc

第4章 （P=109）1.(3.5我觉的类似就只写一道题了)public class pubTestdouble fvar1,fvar2;int ivar1;pubTest(double fvar,int ivar)fvar1=fvar;ivar1=ivar;public static void main(String args)pubTest pubTest1=new pubTest(3.56,5);System.out.println(fvar1=+pubTest1.fvar1);System.out.println(ivar1=+pubTest1.ivar1);System.out.println(fvar2=+pubTest1.sum();double sum()fvar2=fvar1+ivar1;return fvar2;/rect.java interface rectpublic double area();public double getWidth(); public double getHeight(); /Rectangle1.java class Rectangle1 implements rect public double X,Y;Rectangle1() Rectangle1(double i,double j)X=i;Y=j;public double area()double z;z=X*Y;return z;public double getWidth()return X;public double getHeight()return Y;class Square extends Rectangle1Square(double i)X=i;public double area()double z;z=X*X;return z; class testExtendpublic static void main(String argv)Rectangle1 W=new Rectangle1(3.0,4.0);System.out.println(The area is + W.area();System.out.println(The width is + W.getWidth();System.out.println(the height is + W.getHeight(); W=new Square(3.0);System.out.println(The area is+W.area();第6章 （P=146）1.2.3.4/1.import java.awt.*;import java.awt.event.*;public class CopyText extends Frame implements ActionListenerTextField textfield;TextArea textarea;Button button;public CopyText()setLayout(new FlowLayout();textfield=new TextField(20);textarea=new TextArea();button=new Button(CopyText);button.addActionListener(this);add(textfield);add(textarea);add(button);setSize(400,400);setVisible(true);public void actionPerformed(ActionEvent event )String tempa=new String();if(event.getSource()=button)tempa=textfield.getText(); textarea.setText(tempa); public static void main (String args) CopyText Text=new CopyText(); /2.import java.awt.*;import java.awt.event.*;public class CopyLabel extends Frame implements ActionListenerTextField textfield;Label label;Button button;public CopyLabel()setLayout(new FlowLayout();textfield=new TextField(10);label=new Label();label.setBackground(Color.blue);button=new Button(CopyLabel);button.addActionListener(this);add(textfield);add(label);add(button);setSize(100,100);setVisible(true);public void actionPerformed(ActionEvent event )String tempa=new String();if(event.getSource()=button)tempa=textfield.getText(); label.setText(tempa); public static void main (String args) CopyLabel Text=new CopyLabel(); /3import java.awt.*;import java.awt.event.*; class Editable extends Frame implements ActionListenerTextField textfield;Button button,button1;public Editable()setLayout(new FlowLayout();textfield=new TextField(20);button=new Button(可修改);button1=new Button(不可修改);button.addActionListener(this);button1.addActionListener(this);add(textfield);add(button1);add(button);setSize(200,100);setVisible(true);public void actionPerformed(ActionEvent event )if(event.getSource()=button) textfield.setEditable(true);if(event.getSource()=button1) textfield.setEditable(false); public static void main (String args) Editable Text=new Editable(); /4.import java.awt.*;import java.awt.event.*;public class CheckTest extends Frame implements ItemListenerCheckbox check=new Checkbox5;TextArea textarea;String Str;CheckTest() Str=new String(); check0=new Checkbox(1); check1=new Checkbox(2); check2=new Checkbox(3); check3=new Checkbox(4); check4=new Checkbox(5); textarea=new TextArea(5,50); setLayout(new FlowLayout(); for(int i=1;i=5;i+) checki-1.addItemListener(this); add(checki-1); add(textarea); setSize(400,200); setVisible(true); public void itemStateChanged(ItemEvent ie) for(int i=1;i=0) continue; else Str=Str+i+,; textarea.setText(check box,);textarea.append(Str); textarea.append(clicked);Str=; public static void main (String args) CheckTest checktest=new CheckTest(); 第七章计算器（只有界面）import java.awt.*;import java.awt.event.*;class Calculator extends Frame String str=7,8,9,+,4,5,6,-,1,2,3,*,0,.,=,/;check panel1,panel2;public Calculator()setLayout(new GridLayout(2,1);panel1=new check();panel2=new check(str);add(panel1);add(panel2);setSize(200,120);setVisible(true);public static void main(String args)Calculator mypanel=new Calculator(); class check extends PanelTextField text1;Button button1;check()setLayout(new GridLayout(1,2);text1=new TextField(); add(text1);button1=new Button(CE); add(button1);check(String a)setLayout(new GridLayout(4,4); for (int i=0;ia.length;i+) add(new Button(ai);第8章 （P=192）import java.awt.*;import java.applet.*;public class ShowImageApplet extends AppletImage image1;public void init()image1=getImage(getCodeBase(),show.jpg);public void paint(Graphics g)g.drawImage(image1,0,0,this); 第9章 （图片自动显示）import java.awt.*;import java.applet.*;public class SlideImageApplet extends AppletImage image1,image2;boolean runflag=true;int i=1;public void init() image2=createImage(600,400);public void paint(Graphics g)while(runflag) image1=getImage(getCodeBase(),p+i+.jpg); g.drawImage(image1,0,0,this); if(i=3) i=1; else i+; tryThread.sleep(1000); catch(Exception e) g.drawImage(image2,0,0,this); 第10章 （P=246）import java.io.*;public class OneSpace public static void main(String args ) throws java.io.IOException char c; boolean flag=true; while(c=(char)System.in.read()!=n) if(c!= ) System.out.print(c); flag=true; else if(flag) System.out.print(c); flag=false; System.out.println(); 第11章 （多线程）P=272import java.awt.*;import java.awt.event.*;import java.io.*;public class MutiThreadRWFile extends Frame implements Runnable,ActionListenerThread t1,t2,t3,t4,t5,t6,t7,t8,t9,t10;TextArea txt1,txt2,txt3,txt4,txt5;Button b1,b2;BufferedWriter bw;BufferedReader br;public MutiThreadRWFile()setLayout(new FlowLayout();txt1=new TextArea(5,50);txt2=new TextArea(5,50);txt3=new TextArea(5,50);txt4=new TextArea(5,50);txt5=new TextArea(5,50);b1=new Button(Reading File);b2=new Button(Writing File);b1.addActionListener(this);b2.addActionListener(this);add(txt1);add(txt2);add(txt3);add(txt4);add(txt5);add(b1);add(b2);trybw=new BufferedWriter(new FileWriter(test.txt);catch(IOException ie)setSize(450,600);setVisible(true);public void actionPerformed(ActionEvent e)if(e.getSource()=b1)t1=new Thread(this,R1);t1.start();t2=new Thread(this,R2);t2.start();t3=new Thread(this,R3);t3.start();t4=new Thread(this,R4);t4.start();t5=new Thread(this,R5);t5.start();b1.enable(false);elset6=new Thread(this,W1);t6.start();t7=new Thread(this,W2);t7.start();t8=new Thread(this,W3);t8.start();t9=new Thread(this,W4);t9.start();t10=new Thread(this,W5);t10.start();b2.enable(false);public void run()if(Thread.currentThread().getName().equals(R1)txt1.setText(readFile();if(Thread.currentThread().getName().equals(R2)txt2.setText(readFile();if(Thread.currentThread().getName().equals(R3)txt3.setText(readFile();if(Thread.currentThread().getName().equals(R4)txt4.setText(readFile();if(Thread.currentThread().getName().equals(R5)txt5.setText(readFile()