java组件运用案例.docx

组合框运用实例import java.awt.*;import java.awt.event.*;import javax.swing.*;public class IntBinaryJFrame extends JFrame implements ActionListener private JTextField texts; /操作数和运算结果 private JComboBox combox; /算术运算符 public IntBinaryJFrame() super(十进制算术运算的竖式及二进制显示); this.setSize(280,220); this.setResizable(true); Dimension dim=getToolkit().getScreenSize(); /获得屏幕分辨率 this.setLocation(dim.width-this.getWidth()/2, (dim.height-this.getHeight()/2); /窗口居中 this.setBackground(Color.lightGray); this.setDefaultCloseOperation(EXIT_ON_CLOSE); /结束主进程 int number=3; /设置行数为3行 this.getContentPane().setLayout(new GridLayout(number,1); texts = new JTextFieldnumber*2; Object operators=+, -; for (int i=0; inumber; i+) JPanel panel=new JPanel(new FlowLayout(FlowLayout.RIGHT); this.getContentPane().add(panel); if (i=1) combox = new JComboBox(operators); /组合框，默认不可编辑 panel.add(combox); if (i=number-1) JButton button = new JButton(=); panel.add(button); button.addActionListener(this); /注册单击事件监听器 textsi = new JTextField(0,5); textsi.setHorizontalAlignment(SwingConstants.RIGHT); /文本行右对齐 panel.add(textsi); textsi+number = new JTextField(0,8); textsi+number.setHorizontalAlignment(SwingConstants.RIGHT); textsi+number.setEditable(false); panel.add(textsi+number); textsnumber-1.setEditable(false); /只能显示，不允许编辑 this.setVisible(true); public void actionPerformed(ActionEvent e) /按钮单击事件处理方法 try int x=Integer.parseInt(texts0.getText(),10); String a=Integer.toBinaryString(x); int y=Integer.parseInt(texts1.getText(),10); String b=Integer.toBinaryString(y); texts3.setText(a); texts4.setText(b); switch (combox.getSelectedIndex() case 0: x+=y; break; case 1: x-=y; break; texts2.setText(x+); texts5.setText(Integer.toString(x, 2); catch(NumberFormatException nfe) JOptionPane.showMessageDialog(this,字符串不能转换成整数，请重新输入!); finally public static void main(String arg) new IntBinaryJFrame(); 计算器运用实例import java.awt.*;import javax.swing.*;import java.awt.event.*;public class jisuanqi extends JFrame implements ActionListener private JTextField text_math;private JPanel top;private JPanel calckeysPanel;private final String keys = sqrt, +/-, CE, C, 7, 8, 9, /, 4, 5, 6,*, 1, 2, 3, -, 0, ., =, + ;private JButton k = new JButtonkeys.length;private boolean first = true; private double re_num = 0; private String operator = =; private boolean operatev = true;public jisuanqi()super(计算器);this.init();this.setBounds(300, 200, 300, 300);this.setBackground(java.awt.Color.lightGray);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setVisible(true);this.pack();private void init() text_math=new JTextField(0);text_math.setHorizontalAlignment(JTextField.RIGHT);text_math.setBackground(Color.WHITE);top = new JPanel(); top.setLayout(new BorderLayout(); top.add(Center, text_math);calckeysPanel = new JPanel(); calckeysPanel.setLayout(new GridLayout(5, 4, 3, 3); for (int i = 0; i keys.length; i+) ki = new JButton(keysi); calckeysPanel.add(ki); getContentPane().setLayout(new BorderLayout(3, 5); getContentPane().add(North, top); getContentPane().add(Center, calckeysPanel); for (int i = 0; i = 0) handlenum(label); else handleOperator(label); private void handlenum(String k) if (first) text_math.setText(k); else if (k.equals(.) & (text_math.getText().indexOf(.) 0) text_math.setText(text_math.getText() + .); else if (!k.equals(.) text_math.setText(text_math.getText() + k); first = false; private void handleC() text_math.setText(0); first = true; operator = =; private void handleOperator(String k) if (operator.equals(/) / 除法运算 / 如果当前结果文本框中的值等于0 if (getNumberFromText() = 0) / 操作不合法 operatev = false; text_math.setText(除数不能为零); else re_num /= getNumberFromText(); else if (operator.equals(+) / 加法运算 re_num += getNumberFromText(); else if (operator.equals(-) / 减法运算 re_num -= getNumberFromText(); else if (operator.equals(*) / 乘法运算 re_num *= getNumberFromText(); else if (operator.equals(sqrt) / 平方根运算 re_num = Math.sqrt(re_num); else if (operator.equals(+/-) / 正数负数运算 re_num = re_num * (-1); else if (operator.equals(=) / 赋值运算 re_num = getNumberFromText(); if (operatev) / 双精度浮点数的运算 long t1; double t2; t1 = (long) re_num; t2 = re_num - t1; if (t2 = 0) text_math.setText(String.valueOf(t1); else text_math.setText(String.valueOf(re_num); / 运算符等于用户按的按钮 operator = k; first = true; operatev = true; private double getNumberFromText() double result = 0; try result = Double.valueOf(text_math.getText().doubleValue(); catch (NumberFormatException e) return result; 表格运用实例import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.table.DefaultTableModel;public class FangZheng extends JFrame implements ActionListenerprivate JTextField textn;private JButton jb1,jb2;private DefaultTableModel tablemodel;public FangZheng()super(循环移位方阵);Dimension dim=getToolkit().getScreenSize(); this.setBounds(dim.width/4,dim.height/4,dim.width/2,dim.height/2); this.setBackground(java.awt.Color.lightGray); this.setDefaultCloseOperation(EXIT_ON_CLOSE); JPanel panel=new JPanel(); this.getContentPane().add(panel,North); panel.add(new JLabel(随机个数（范围1-10）：); textn=new JTextField(5,5); panel.add(textn); jb1=new JButton(确定); panel.add(jb1); jb1.addActionListener(this); String lk= , ; for(int i=0;ilk.length;i+) panel.add(new JLabel(lki); panel.add(new JLabel(循环移位); jb2=new JButton(开始); jb2.addActionListener(this); panel.add(jb2); String titles=new String10; for(int i=0;ititles.length;i+) titlesi=(i+1)+; this.tablemodel=new DefaultTableModel(titles,10); JTable table=new JTable(this.tablemodel); this.getContentPane().add(new JScrollPane(table),Center); this.setVisible(true);public void actionPerformed(ActionEvent e) if(e.getSource()=jb1)tryint n=Integer.parseInt(this.textn.getText();for(int i=0;i10;i+)for(int j=0;j10;j+)this.tablemodel.setValueAt(null, i, j);random(n);catch(NumberFormatException nfex) JOptionPane.showMessageDialog(this, 无法转换成整数, 提醒, JOptionPane.WARNING_MESSAGE); if(e.getSource()=jb2)int n=Integer.parseInt(this.textn.getText();for(int i=1;in;i+)for(int j=0;jn-1;j+)this.tablemodel.setValueAt(this.tablemodel.getValueAt(i-1, j), i, j+1);this.tablemodel.setValueAt(this.tablemodel.getValueAt(i-1, n-1), i, 0);private void random(int n) for(int j=0;j10;j+)if(jn)this.tablemodel.setValueAt(int)(Math.random()*100)+, 0, j);else this.tablemodel.setValueAt(null, 0, j);public static void main(String args) new FangZheng();画布运用实例import java.awt.*; import java.awt.event.*; import javax.swing.*; public class ArchimedesJFrame extends JFrame implements ActionListener private ArchimedesCanvas archimedes; private JButton jb3;private JPanel jp1;private JTextField text_q;private JRadioButton bcolor;private double n; public ArchimedesJFrame() super(阿基米德螺线); Dimension dim=getToolkit().getScreenSize(); this.setBounds(dim.width/4,dim.height/4,dim.width/2,dim.height/2); this.setDefaultCloseOperation(EXIT_ON_CLOSE); text_q=new JTextField(10); jp1=new JPanel(); jp1.add(new JLabel(圈数：); jp1.add(text_q); jb3=new JButton(确定); jp1.add(jb3); jb3.addActionListener(this); String lk= , ; for(int i=0;ilk.length;i+) jp1.add(new JLabel(lki); jp1.add(new JLabel(颜色：); String colorstr=红,绿,蓝; ButtonGroup colorgroup=new ButtonGroup(); bcolor=new JRadioButtoncolorstr.length; for(int i=0;ibcolor.length;i+) bcolori=new JRadioButton(colorstri); colorgroup.add(bcolori); jp1.add(bcolori); bcolori.addActionListener(this); this.getContentPane().add(jp1,North); archimedes=new ArchimedesCanvas(Color.black,this.n); this.getContentPane().add(new JScrollPane(archimedes),Center); this.setVisible(true); public void actionPerformed(ActionEvent e) Color c=null; if(e.getSource()=bcolor0) c=new Color(255,0,0); if(e.getSource()=bcolor1) c=new Color(0,255,0); if(e.getSource()=bcolor2) c=new Color(0,0,255); if(e.getSource()=jb3) try this.n=Double.parseDouble(text_q.getText(); catch(NumberFormatException nfex) JOptionPane.showMessageDialog(this, 无法转换成浮点数, 提醒, JOptionPane.WARNING_MESSAGE); try if(n20) throw new Exception( ); archimedes.setn(n); archimede