本题的功能是读人运行程序时所传入的参数(一个或多个),并将参数依次显示出来,比如运行程序:java javal
partl part2,则打印输出为:partl part2。
public class javal{
public static void main(String[]args){
int i=0:
while(____){
System.OUt.print(____+"");
____;
}
System.out.println();
}
}
本题的功能是用文本框来设定表盘中指针的位置。窗口中有一个画板和两个文本框,画板中绘制了一个表盘和时针、分针,通过文本框分别设定“时”和“分”,表盘中的时针和分针就会指到对应的位置上。
import java.awt.*;
import java.awt.event*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.event.*;
public class java3
{
public static void main(String[]args)
{
TextTestFrame. frame=new TextTestFrame():
frame.setDefauhCloseOperation(JFrame.EXIT_
0N_CLOSE);
frame.show();
}
}
class TextTestFrame. extends JFrame
{
public TextTestFrame()
{
setTitle("java3"):
setSize(DEFAULT_WIDTH,DEFAULT_
HElGHT);
Container contentPane=getContentPane();
DocumentListener listener=new DoeumentListen-
er();
JPanel panel=new JPanel();
hourField=new JTextField("12",3);
panel.add(hourField);
hourField.getDocument().addDocumentListener
(this);
minuteField=new JTextField("00",3):
panel.add(minuteField);
minuteField.getDocument().addDocumentListener
(listener);
contentPane.add(panel,BorderLayout.S()UTH);
clock=new ClockPanel();
contentPane.add(clock,BorderLayout.CEN-
TER);
}
public void setClock()
{
try
{
int hours
=Integer.parseInt(hourField.getText().trim
()):
int minutes
=Integer.parseInt(minuteField.getText().trim
());
clock.setTime(hours,minutes);
}
catch(NumberFormatExcepfion e){}
}
public static final int DEFAULT_WIDTH=300;
public static final int DEFAULT_HEIGHT
=300;
private J TextField hourField;
private JTextField minuteField;
private ClockPanel clock;
private class clockFieldListener extends Docu-
mentListener
{
public void insertUpdate(DocumentEvent e){ set-
Clock();}
public void removeUpdate(DocumentEvent e){
setClock();}
public void changedUpdate(DocumentEvent e){}
}
}
class ClockPanel extends JPanel
{
pubhc void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphies2D g2=(Graphics2D)g;
Ellipse2D circle
=new Ellipse2D.Double(0,0,2* RADIUS,2
*RADIUS);
g2.draw(circle);
double hourAngle
=Math.toRadians(90-360*minutes/(12
*60));
drawHand(92,hourAngle,HOUR_HAND_
LENGTH);
double minuteAngle
=Math.toRadians(90-360*minutes/60);
drawHand(g2,minuteAngle,MINUTE_HAND_
LENGTH):
}
punic void drawHand(Graphics2D g2,
double angle,double handLength)
{
Point2D end=new Point2D.Double(
RADIUS+handLength*Math.cos(angle),
RADIUS-handLength*Math.sin(angle));
Point2D center=new Point2D.Double(RADIUS,
RADIUS):
g2.draw(new Line2D.Double(center,end));
}
public void setTime(int h,int m)
{
minutes=h*60+m;
repaint();
}
private double minutes=0;
private double RADIUS=100;
private double MINUTE_HAND_LENGTH=
0.8*RADIUS;
private double HOUR_HAND_LENGTH=0.6
*RADIUS:
}
下面程序中,在主窗口单击鼠标后,就会生成一个新
窗口。
import java.awt.*;
import java.awt.event.*;
public class java3 extends Frame{
java3(){
super("java3");
addNotify();
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
Insets insets=getInsets();
setSize(insets.left+insets.right+150,
insets.top+insets.bottom+150);
this.addMouseListener(MouseEventHandler());
}
class MouseEventHandler implements MouseAda-
pter{
public void mousePresse(MouseEvent evt){
Rectangle bounds=getBounds();
int x=evt.getX()+bounds.x;
int y=evt.getY()十bounds.y;
java3 m=newjava3();
m.setLocation(x,y);
m.show();
}
}
static public void main(String[]args){
(new java3()).show();
}
}
本题的功能是用按钮来控制文本框中文本的颜色。窗口中有两个带有文字标题的面板“Sample text”和“Text col—or control”,窗口的底部还有一个复选按钮“Disable chan-ges”。在“Sample text”面板中有一个带有宇符串的文本框,而在“Text color control”面板中有三个按钮“Black”、“Red”和“Green”,并且每个按钮上都有一个对应颜色的圆。单击任意按钮,文本框的文本变成对应的颜色,如果选中“Disa-ble changes”复选框,则三个颜色按钮变为不可用,如果取消选中复选框,则三个按钮变为可用。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class java3 extends JFrame{
private JPanel upper,middle,lower;
private JTextField text;
private JButton black,red,green;
private JCheckBox disable;
public java3(String titleText){
super(titleText);
addWindowListener(new WindowAdapter(){
public void
windowClosing(WindowEvent e){
System.exit(0);
}
});
upper=new JPanel();
upper.setBorder(BorderFactory.ereateTitledBor-
der("Sample text")):
Upper.setlayout(new BorderLayout());
text=new JTextField("Change the color of this
text");
upper.add(text,BorderLayout.CENTER);
middle=new JPanel();
middle.setBorder(BorderFactory.createTitledBor-
der("Text color control"));
middle.setLayout(new FlowLayout(FlowLayout.
CENTER)):
black=new JButton("Black",new ColorIcon(
Color.black));
black.addActionListener(new ButtonListener(
Color.black));
middle.add(black);
red=new JButton("Red",new ColorIeon(Col-
or.red));
red.addActionListener(new ButtonListener(Col-
or.red));
middle.add(red);
green=new JButton("Green",new ColorIcon(
Color.green));
green.addActionListener(new ButtonListener(
Color.green));
middle.add(green);
lower=new JPanel();
lower.setLayout(new FlowLayout(FlowLayout.
RIGHT));
disable=new JCheckBox("Disable changes");
disable.addhemListener(new hemListener(){
public void itemStateChanged(hemEvent e){
boolean enabled
= (e.getStateChange()
= =ItemEvent.DESELECTED);
black.setEnabled(enabled);
red.setEnabled(enabled);
green.setEnabled(enabled);
}
}
);
lower.add(disable):
Container cp=getContentPane();
cp.add(upper,BorderLayout.NORTH);
ep.add(middle,BorderLayout.CENTER);
ep.add(10wer,BorderLayout.SOUTH);
pack();
setVisible(true);
}
class ButtonListener extends ActionListener{
private Color c;
public ButtonListener(Color c)f
this.c=c;
}
public void aetionPerformed(ActionEvent e){
text.setForeground(c);
}
}
class ColorIcon implements Icon{
private Color c;
private static final int DIAMETER=10;
public Colorlcon(Color c){
c=c;
}
public void paintleon(Component cp,Graphics g,
int X,int Y){
g.setColor(e);
g.fillOval(x,Y,DIAMETER,DIAMETER);
g.setColor(Color.black);
g.drawOval(x,y,DIAMETER,DIAMETER);
}
public int getIconHeight(){
return DIAMETER:
}
public int getlconWidth(){
return DIAMETER;
}
}
public static void main(String[]args){
new java3("java3");
}
}
本题的功能是用按钮来控制文本框中文本的颜色。窗口中有两个带有文字标题的面板“Sample text”和“Text color control”,窗口的底部还有一个复选按钮“Disable changes”。在“Sample text”面板中有一个带有字符串的文本框,而在“Text color control”面板中有三个按钮:“Black”、“Red”和“Green”,并且每个按钮上都有一个对应颜色的圆。单击任意按钮,文本框中的文本变成对应的颜色,如果选中“Disable changes”复选项,则三个颜色按钮变为不可用,如果取消选中复选项,则三个按钮变为可用。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class java3 extends JFrame{
private JPanel upper,middle,lower;
private JTextField text;
private JButton black,red,green;
private JCheckBox disable;
public java3(String titleText){
super(titleText);
addWindowListener(new WindowAdapter(){
public void
windowClosing(WindowEvent e){
System.exit(0);
}
}
);
upper=new JPanel();
upper.setBorder(BorderFactory.ereateTitledBor-
der("Sample text"));
upper.setlayout(new BorderLayout());
text=new JTextField("Change the color of this
text"):
upper.add(text,BorderLayout.CENTER);
middle=new JPanel();
middle.setBorder(BorderFactory.createTitledBor-
der("Text color control"));
middle.setLayout(new FlowLayout(FlowLayout.
CENTER)):
black=new JButton("Black",new ColorIcon
(Color.black));
black.addActionListener( new ButtonListener
(Color.black));
middle.add(black);
red=new JButton("Red",new ColorIcon(Col-
or.red));
red.addActionListener(new ButtonListener(Col-
or.red));
middle.add(red);
green=new JButton("Green",new ColorIcon
(Color.green));
green.addActionListener(new ButtonListener
(Color.green));
middle.add(green);
lower=new JPanel();
lower.setLayout(new FlowLayout(FlowLayout.
RIGHT));
disable=new JCheckBox("Disable changes"):
disable.addItemListener(new ItemListener()(
public void itemStateChanged(ItemEvent e){
boolean enabled
=(e.getStateChange()
= =ItemEvent.DESELECTED):
black.setEnabled(enabled);
red.setEnabled(enabled);
green.setEnabled(enabled);
}
}
);
lower.add(disable);
Container cp=getContentPane();
cp.add(upper,BorderLayout.NORTH);
cp.add(middle,BorderLayout.CENTER);
cp.add(10wer,BorderLayout.SoUTH);
pack();
setVisible(true);
}
class ButtonListener extends ActionListener{
private Color c;
public ButtonListener(Color c){
this.c=c;
}
public void actionPerformed(ActionEvent e){
text.setForeground(c);
}
}
class ColorIcon implements Icon{
private Color c;
private static final int DIAMETER=10;
public ColorIcon(Color c){
c=c;
}
public void paintlcon(Component cp,Graphics g,
int x,int y){
g.setColor(c);
g.fillOval(X,y,DIAMETER,DIAMETER);
g.setColor(Color.black);
g.drawOval(x,y,DIAMETER,DIAMETER);
}
public int getlconHeight(){
return DIAMETER;
}
public int getlconWidth(){
return DIAMETER;
}
}
public static void main(String[]args){
new java3("advance");
}
}
本题中,生成一个窗口,该窗口的长、宽为屏幕长、宽的一半,并且窗口的大小不能改变。
import java.awt.*;
import javax.swing.*;
public class java2
{
public.static void main(String[]args)
{
FrameSize frame=new FrameSize();
frame.setDefaultCloseoperation(JFrame.EXIT
ON_CLOSE);
frame.show();
}
}
class FrameSize extends JFrame
{
public FrameSize()
{
setTitle("java2");
Toolkit tk=Toolkit.getDefaultToolkit();
Dimension screenSize=____
int screenHeight=screenSize.height;
int screenWidth=screenSize.width;
setSize(screenWidth/2,sereenHeight/2);
____;
}
本题中定义了一个简单的计算器,可以进行基本的四则运算。程序中包含16个按钮用来表示0~9、+、-、 *、/、一运算符和小数点,程序顶部的文本框用来显示操作数以及结果。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class java2{
public static void main(String[]args){
try{
UIManager.setLookAndFeel(UIManager.getSys-
temLookAndFeelClassName());
}
catch(Exception e){}
JFrame. frame=new CalculatorFrame();
frame.show();
}
}
class CalculatorPanel extends JPanel implements Ac-
tionListener{
private JTextField display;
private JButton btn;
private double arg=0;
private String p="=";
private boolean start=true;
public CalculatorPanel(){
setLayout(new BorderLayout());
display=new JTextField("0");
display.setEditable(false);
add(display,"North");
JPanel P=new JPanel();
P.setLayout(new GridLayout(4,4));
String buttons="789/456*123-0.=+":
for(int i=0;i<;buttons.length();i++){
btn=new JButton(buttons.substring(i,i+
1));
P.add(btn);
____;
}
add(P,"Center");
}
public void actionPerformed(ActionEvent evt){
String s=evt.getActionCommand();
if(‘0 ‘<;=s.charAt(0)&&s.charAt(O)<;=‘
9‘‖ s.equals("-")){
if(start)display.setText(s):
else display.setText(display.getText()+s);
start=false;
}
else{
if(start){
if(s.equals("-")){
display.setText(s):
start=false;
}
else p=S;
}
else(
double x=____
calculate(x);
op=S:
start=true;
}
}
}
public void calculate(double n){
if(op.equals("+"))arg+=n:
else if(op.equals("-"))arg-=n;
else if(op.equals("*"))arg*=n;
else if(op.equals("/"))arg/=n;
else if(op.equals("="))arg=n;
display.setText(""+arg);
}
}
class CalculatorFrame. extends JFrame{
public CalculatorFrame(){
setTitle("java2");
setSize(220,180);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
Container contentPane=getContentPane();
contentPane.add(new CalculatorPanel());
}
}
本题使用下拉菜单来控制字体,窗口中有一个标签和一个下拉菜单,当选中下拉菜单中的任一项字体时,标签上字符串的字体就随之改变。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class ComboBoxFrame. extends JFrame.____{
public ComboBoxFrame(){
setTitle("java2");
setSize(300,200);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
style=new JComboBox():
style.setEditable(true);
style.addhem("Serif");
style.addItem("SansSerif");
style.addhem("Monospaced");
style.addhem("Dialog");
style.addhem("Dialoglnput");
style.addActionListener(this);
JPanel p=new JPanel();
P.add(style);
getContentPane().add(p,"South");
panel=new ComboBoxTestPanel();
getContentPane().add(panel,"Center");
}
public void actionPerformed(ActionEvent evt){
JComboBox source=(JComboBox)____;
String item=(String)source.getSelectedhem():
panel.setStyle(item);
}
private ComboBoxTestPanel panel;
private JComboBox style;
}
class ComboBoxTestPanel extends JPanel{
public ComboBoxTestPanel(){
setStyle("Serif");
}
public void setStyle(String s){
setFont(new Font(S,Font.PLAIN,12));
repaint();
}
public void paintComponent(Graphics g){
super.paintComponent(g);
9.drawString("Welcome to China!",0,50);
}
}
public class java2{
public static void main(String[]args){
JFrame. frame=new ComboBoxFrame();
frame.show();
}
}
本题的功能是对下拉菜单项的操作,包括添加和删除。页面包括一个下拉菜单、一个文本框和两个按钮“删除”和“添加”,选中下拉菜单的一项后,可以通过“删除”按钮从下拉菜单中删除该项,在文本框中填入字符串后,单击“添加”按钮就可以将该项添加到下拉菜单中,所有信息都将显示在右侧的文本域中。
import java.awt.*;
import java.awt.event.*;
public class java2 extends java.applet.Applet imple-
ments hemListener,ActionListener
{Choice choice;
TextField text;
TextArea area;
Button add,del;
public void init() .
{choice:new Choice();
text=new TextField(8);
area:new TextArea(6,15);
choice.add("音乐天地");
choice.add("武术天地");
choice.add("象棋乐园");
choice.add("交友聊天");
add=new Button("添加");
del=new Button("删除");
add.addActionListener(this);
del.addActionListener(this);
choice.addItemListener(this);
add(choice);
add(del);add(text);add(add);add(area);
}
public void itemStateChanged(hemEvent e)
{String name=____;
int index=choice.getSelectedIndex();
area.setText("\n"+index+":"+name);
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()= =add||e.getSource()= =
text)
{String name=text.getText();
if(name.length()>;0)
{choice.add(name);
choice.select(name);
area.append("\n添加"+name);
}
}
else if(e.getSource()= =del)
{choice.remove(____);
area.append("\n删除"+choice.getSelectedItem
());
}
}
}
本题的功能是读人运行程序时所传入的参数(一个或多个),并将参数依次显示出来,比如运行程序:java javal
partl part2,则打印输出为:partl part2。
public class javal{
public static void main(String[]args){
int i=0:
while(____){
System.OUt.print(____+"");
____;
}
System.out.println();
}
}
本题的功能是统计成绩不及格的人数,分数有89,90, 56,90,89,45。23,45,60,59,61。
public class javal{
public static void main(String[]args)(
int 3score={56。90。89,23,45,61,60,59};
int hum=0;
____;
int i=0:
while(____){
if(____)
sum++:
i++;
}
System.out.println(”<;60:”+sum);
}
}
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