问答题
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 java1
public static void main(String[]args)
int[]score=56,90,89,23,45,61,60,59;
int num=0;
______;
int i=0;
while(______)
if(______)
sum++;
i++;
System.out.println("<60:"+sum);
【参考答案】
第1处:int sum=0
第2处:i<score.length
第3处:score[i]<60或s......
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本题中,窗口的背景色为系统桌面的颜色,在窗口中分别画空心和实心的黑色矩形、深灰色圆角矩形和浅灰色椭圆形,并且画白色粗体的“欢迎学习Java!”字符串。 import java.awt.*; import javax.swing.*; public class java2 public static void main(String[]args) FillFrame frame=new FillFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.show(); class FillFrame extends JFrame public FillFrame() setTitle( java2 ); setSize(WIDTH,HEIGHT); FillPanel panel=new FillPanel(); panel.setBackround(SystemColor.desktop); Container contentPane=getContentPane(); contentPane.add(panel); public static final int WIDTH=400; public static final int HEIGHT=250; class FillPanel extends JPanel public void paintComponent(Graphics g) ______; g.setColor(new Color(10,10,10)); g.drawRect(10,10,100,30); g.setColor(new Color(100,100,100)); g.drawRoundRect(150,10,100,30,15,15); g.setColor(new Color(150,150,150)); g.drawOval(280,10,80,30); g.setColor(new Color(10,10,10)); g.fillRect(10,110,100,30); g.setColor(new Color(100,100,100)); g.fillRoundRect(150,110,100,30,15,15); g.setColor(new Color(150,150,150)); g.fillOval(280,110,80,30); g.setColor(Color.white); Font f=new Font( 宋体 ,______,20); g.setFont(f); g.drawstring( 欢迎学习Java! ,150,200);
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本题的功能是对图形进行操作,包括旋转、移位、放大和剪切。窗口中有4个单选按钮和一个图形面板,图形面板中有一个矩形和该矩形移位操作后的图形,任选其中一个单选按钮,则图形面板中将显示该操作后的图形。 import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import java.util.*; import javax.swing.*; public class java3 public static void main(String[]args) JFrame frame=new TransformTestFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.show(); class TransformTest extends JFrame public TransformTestFrame() setTitle( java3 ); setSize(WIDTH,HEIGHT); Container contentPane=getContentPane(); canvas=new TransformPanel(); contentPane.add(canvas,BorderLayout,CENTER); JPanel buttonPanel=new JPanel(); ButtonGroup group=new ButtonGroup(); JRadioButton rotateButton =new JRadioButton( 旋转 ,true); buttonPanel.add(rotateButton); group.add(rotateButton); rotateButton.addActionListener(new ActionListener() public void actionPerformed(ActionEvent event) canvas.setRotate(); ); JRadioButton translateButton =new JRadioButton( 移位 ,false); buttonPanel.add(translateButton); group.add(translateButton); translateButton.addActionListener(new ActionListener() public void actionPerformed(ActionEvent event) canvas.setTranslate(); ); JRadioButton scaleButton =new JRadioButton( 放大 ,false); buttonPanel.add(scaleButton); group.add(scaleButton); scaleButton.addActionListener(new ActionListener() public void actionPerformed(ActionEvent event) canvas.setScale(); ); JRadioButton shearButton =new JRadioButton( 剪切 ,false); buttonPanel.add(shearButton); group.add(shearButton); shearButton.addActionListener(new ActionListener() public void actionPerformed(ActionEvent event) canvas.setShear(); ); contentPane.add(buttonPanel,BorderLayout.NORTH) private TransformPanel canvas; private static final int WIDTH=300; private static final int HEIGHT=300; class TransformPanel extend JPanel public TransformPanel() square=new Rectangle2D.Double(-50,-50,100,100); t=flew AffineTransform(); setRotate(); public void paintComponent() super.paintComponent(g); Graphics2D g2=(Graphics2D)g; g2.translate(getWidth() 2,getHeight() 2); g2.setPaint(Color.gray); g2.draw(square); g2.transform(t); g2.setPaint(Color.black); g2.draw(square); public void setRotate() t.setToRotation(Math.toRadians(30)); repaint(); public void setTranslate() t.setToTranslation(20,15); repaint(); public void setScale() t.setToScale(2.0,1.5); repaint(); public void setShear() t.setToShear(-0.2,0); repaint(); private Rectangle2D square; private AffineTransform t;
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