Java

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???)