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Java

Java?????. ??????(?????????) ???? ???? ???? ???? ????? ???. ????. ??????????????,???????????????????????,?????????????,??????????????????????????applet?????????????????????. import?javax.swing.*; import?java.awt.*;public?class?exec? { ?public?static?void?main(String?[]?args) ?{ ??JFrame?f=n

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Java

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    1. Java???? ?????????? IT??????

    2. Java????? ??????(?????????) ???? ???? ???? ???? ????? ???

    3. ???? ??????????????,?????????? ?????????????,?????????????,????????????????? ?????????applet?????????????????????

    4. import javax.swing.*; import java.awt.*; public class exec  {  public static void main(String [] args)  {   JFrame f=new JFrame("Hello!");   f.setLocation(10,100);   f.setSize(600,400);      f.getContentPane().setLayout(new FlowLayout());   JButton jb1=new JButton("Click 1");   JButton jb2=new JButton("Click 2");   JButton jb3=new JButton("Click 3");   f.getContentPane().add(jb1);   f.getContentPane().add(jb2);   f.getContentPane().add(jb3);      f.setVisible(true);  }  }

    5. ??,??????????????????,?????????????,?: import javax.swing.*; import java.awt.*; public class exec  {  public static void main(String [] args)  {   JFrame f=new JFrame("Hello!");   f.setLocation(10,100);   f.setSize(600,400);      f.getContentPane().setLayout(new FlowLayout(1,10,100));   JButton jb1=new JButton("Click 1");   JButton jb2=new JButton("Click 2");   JButton jb3=new JButton("Click 3");   f.getContentPane().add(jb1);   f.getContentPane().add(jb2);   f.getContentPane().add(jb3);      f.setVisible(true);  }  }

    6. ??: 1)?????????????????????:??????????,?0?????,1????,2???,3????,4????;??????????;??????????? 2)????????????,???????,????,???????????????,????????????????????????100???????,?????????,????????????????????????????????????,???setResizable()????,?:

    7. import javax.swing.*; import java.awt.*; public class exec  {  public static void main(String [] args)  {   JFrame f=new JFrame("Hello!");   f.setLocation(10,100);   f.setSize(600,400);      f.getContentPane().setLayout(new FlowLayout(1,10,100));   JButton jb1=new JButton("Click 1");   JButton jb2=new JButton("Click 2");   JButton jb3=new JButton("Click 3");   f.getContentPane().add(jb1);   f.getContentPane().add(jb2);   f.getContentPane().add(jb3);   f.setResizable(false);//??      f.setVisible(true);  }  }

    8. 3)??????????????????,???????????,???????????????,???????????????????????????,?????????????????: import javax.swing.*; import java.awt.*; public class exec  {  public static void main(String [] args)  {   JFrame f=new JFrame("Hello!");   f.setLocation(10,100);   f.setSize(150,400);      f.getContentPane().setLayout(new FlowLayout(1,10,10));   JLabel l=new JLabel("****???****");   JLabel l1=new JLabel("?1:");   JLabel l2=new JLabel("?2:");   JLabel l3=new JLabel("?:");   JTextField t1=new JTextField(5);   JTextField t2=new JTextField(5);   JTextField t3=new JTextField(10);   JButton b=new JButton("Sum");   JPanel p1=new JPanel();   JPanel p2=new JPanel();   JPanel p3=new JPanel();   JPanel p4=new JPanel();   JPanel p5=new JPanel();      p1.setLayout(new FlowLayout(FlowLayout.CENTER,0,10));   p1.add(l);   p2.setLayout(new FlowLayout(FlowLayout.CENTER,10,0));   p2.add(l1);   p2.add(t1);   p3.setLayout(new FlowLayout(FlowLayout.CENTER,10,0));   p3.add(l2);   p3.add(t2);   p4.setLayout(new FlowLayout(FlowLayout.CENTER,10,0));   p4.add(l3);   p4.add(t3);   p5.setLayout(new FlowLayout(FlowLayout.CENTER,10,10));   p5.add(b);      f.getContentPane().add(p1);   f.getContentPane().add(p2);   f.getContentPane().add(p3);   f.getContentPane().add(p4);   f.getContentPane().add(p5);     f.setVisible(true);  }  }

    9. ???? ???????????,????? ???????????,????????????????,?????????????? ??????????,??????????,??????,??????? ???????????????,????????????????,??,????????????????????? ????:panel.setLayout(new GridLayout(5,4)); ????:panel.add(new JButton(“1”)); panel.add(new JButton(“2”));

    10. import javax.swing.*; import java.awt.*; public class exec  {  public static void main(String [] args)  {   JFrame f=new JFrame("Hello!");   f.setLocation(10,100);   f.setSize(600,400);   f.setMinimumSize(new Dimension(200,100));      f.getContentPane().setLayout(new GridLayout(3,3,10,10));   JButton[] jb=new JButton[9];      for(int i=0;i<jb.length;i++)   {    jb[i]=new JButton(String.valueOf(i));    f.getContentPane().add(jb[i]);   }    f.setVisible(true);    }  } ??: ???????????????????,??????????,??????????????????

    11. ???? ??????????????? : ?(north)??(south)??(east)??(west)??(center),?????????? ???????????????,??????????????????? ?????????????,???????? ???????????????????add(Object,String)//Object??????;String???????,?:BorderLayout.NORTH ????????:?????????????

    12. ????????????????????????? ??????????:????????????,?????????????? ?:panel = new Panel(); panel.add(new Button(“??”)); panel.add(new Label(“??”)); add(panel,BorderLayout.SOUTH);

    13. import javax.swing.*; import java.awt.*; public class exec  {  public static void main(String [] args)  {   JFrame f=new JFrame("Hello!");   f.setLocation(10,100);   f.setSize(600,400);   f.setMinimumSize(new Dimension(200,100));      f.getContentPane().setLayout(new BorderLayout(5,10));   JButton jb1=new JButton("1");   JButton jb2=new JButton("2");   JButton jb3=new JButton("3");   JButton jb4=new JButton("4");   JButton jb5=new JButton("5");      f.getContentPane().add(jb1,BorderLayout.NORTH);   f.getContentPane().add(jb2,BorderLayout.SOUTH);   f.getContentPane().add(jb3,BorderLayout.EAST);   f.getContentPane().add(jb4,BorderLayout.WEST);   f.getContentPane().add(jb5,BorderLayout.CENTER);      f.setVisible(true);    }  } ??: ???????????????????????????????????,????????????????????????????????????????,????????????????,??,???????????????????

    14. ????(CardLayout) ??????????????,??????????? ?????????: 1?????????:mycard=new CardLayout(); 2?????:container.setLayout(mycard) 3?????:container.add(????,??); 4???:mycard.show()

    15. ?????????(con???)

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