问答题 本题定义了一个长度为l0的boolean型数组,并给数组元素赋值,要求如果数组元素下标为奇数,则数组元素值 为false,否则为true。 public class javal{ pubhc static void main(String[]args){ boolean b[]=; for(int i=0;i<10;i++){ if( ) b[i]=false; else ; } for(int i=0;i<10;i++) System.Out.print("bE"+i+"]="+b[i]+","); } }
问答题 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: }
问答题 本题利用递归方法求前n个自然数的和(n=lO)。 public class javal{ public static void main(String[]args){ int sum=add(10): System.out.println("1+2+…+9+10="+ sum); } public static int add( ){ if(n= =l){ ; } else ; } }
判断题 商业银行财务管理主要是指商业银行对各职能部门、分支机构的成本费用和利润进行控制考核,其目的降低整体经营成本、提高经济效益。
问答题 本题将数组中arr[]={5,6,3,7,9,1}的各个元素按下标的逆序输出。 public class javal{ public static void main(String[]args){ int arr[]={5,6,3,7,9,1}; ; n= ; while(n>=O){ System.OUt.print(arr[n]+""); ; } } }
问答题 本题的功能是用复选按钮来控制鼠标右键的弹出菜单是否弹出。窗口中有一个复选按钮“弹出菜单”,如果选中该复选按钮后,鼠标置于窗口上,单击鼠标右键会弹出一个菜单,单击菜单项中的选项后,后台会输出单击的菜单项,如果取消该复选按钮的选择,单击鼠标右键则不能弹出菜单。 import java.awt.*; import java.awt.event.*; class CanvasWithPopup extends Canvas{ Popupmenu popup; CanvasWithPopup(PopupMenu popup){ enableEvents(AWTEvent.MOUSE EVENT MASK): this.popup=popup; } void addPopup(){ add(popup); } void removePopup(){ remove(popup); } protected void processMouseEvent(MouseEvent evt){ if(popup.getParent()!=null&&evt.isPop- upTrigger()){ popup.show(evt.getComponent(),evt.getX(), evt.getY()); } super.processMouseEvent(evt); } } public class java3 extends Frame implements Item- Listener,ActionListener{ Checkbox cb=new Checkbox("弹出菜单", false); CanvasWithPopup canvas; java3(){ super("java3"); addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ System.exit(0); } }); add(cb,BorderLayout.NORTH); cb.addhemListener(this); PopupMenu popup=new PopupMenu("Button Control"): popup.add("iteml"); popup.add("item2"); popup.addActionListener(this); canvas=new CanvasWithPopup(popup); add(canvas,BorderLayout.CENTER); setSize(100,200); show(); }
判断题 一般来说,确定“金牌”客户的基本方法是估算客户带来的利益。
问答题 本题将一个整形变量opl的二进制的低3位全部变成1。 public class javal{ public static void main(String[]args){ opl=21; int op2=7: res; ; System.out.println(res); } }
问答题 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(); } }
判断题 银行可以通过建立客户档案的形式来实现对客户信息的收集与整理。