实验六 Java期中考试

.

期中考试：

二、

package Exextra_2;

import .*;

publicclass Test {

publicstaticvoid main {

int[] a=newint[10];

Scanner scan=new Scanner<>;

for{

a[i]=t<>;

}

int max=a[0];

int min=a[0];

for{

ifmax>

max=a[i];

}

for{

if

min=a[i];

}

n<"max="+max+" min="+min>;

}

}

三、

package Exextra_3;

publicclass Point {

privateintx,y;

privatedoubles;

public Point<>{

}

public Point{

this.x=x;

this.y=y;

}

publicint getX<>{

returnx;

}

publicvoid setX{

this.x=x;

}

publicint getY<>{

returny;

}

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.

publicvoid setY{

this.y=y;

}

public String toString<>{

return"<"+x+","+y+">";

}

publicdouble distance{

int x1=<>;int y1=<>;

int x2=<>;int y2=<>;

s=<*+*>;

returns;

}

}

package Exextra_3;

publicclass Test {

publicstaticvoid main {

Point p1=new Point<4,5>;

Point p2=new Point<2,1>;

double s=ce;

n>;

n>;

n;

}

}

四、

package Exextra_4;

publicinterface Shape{

publicabstractdouble area<>;

}

package Exextra_4;

publicclass MyCircle implements Shape{

privatedoubler;

public MyCircle{

this.r=r;

}

publicdouble area<>{

return *r*r;

}

public String toString<>{

return"circle: r="+r+" area="+<>;

}

}

package Exextra_4;

publicclass MyRectangle implements Shape {

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.

privatedoublew,h;

public MyRectangle{

this.w=w;

this.h=h;

}

publicdouble area<>{

returnw*h;

}

public String toString<>{

return"Rectangle: width="+w+" "+"height="+h+" area="+<>;

}

}

package Exextra_4;

publicclass Test {

publicstaticvoid main {

Shape t1=new MyRectangle<10,5>;

n>;

Shape t2=new MyCircle<3>;

n>;

}

}

五、

package Exextra_5;

import .*;

import .*;

import .*;

publicclassMyFrmextends JFrame implements ActionListener{

intm=0;

JButton btn1=new JButton<"点我">;

JButton btn2=new JButton<"清零">;

JLabel lb=new JLabel<"共点击了0次">;

public MyFrm<>{

JPanel jp=tentPane<>;

out>;

;;;

ionListener;

ionListener;

le<"ButtonDemol">;

}

publicvoid actionPerformed{

if==btn1>{

m=m+1;

t<"共点击了"+m+"次">;

}

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.

if==btn2>{

m=0;

t<"共点击了"+m+"次">;

}

}

publicstaticvoid main{

MyFrm frm=new MyFrm<>;

e<400,100>;

ible;

}

}

数据库调试：

package mydb;

import .*;

publicclass StudentDao {

private String driver = "bcDriver";

private String url = "jdbc:odbc:mydb";

privatevoid executeUpdate {

try {

e;

Connection con = nection;

Statement cmd = Statement<>;

eUpdate;

<>;

} catch {

tackTrace<>;

}

}

publicvoid addStudent {

String sql = "insert into student values<'" + sno + "','" + sname+

"','" + major + "'," + zg + ">";

executeUpdate;

}

publicvoid deleteStudentBySno {

String sql = "delete from student where sno='" + sno + "'";

executeUpdate;

}

public String[][] queryStudents<> {

String[][] rows = null;

try {

e;

Connection con = nection;

Statement cmd = Statement<>;

String sql = "select count<*> from student";

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.

ResultSet rs = eQuery;

<>;

int rowcount = <1>;

rows = new String[rowcount][4];

sql = "select * from student";

rs = eQuery;

rowcount = 0;

while <<>> {

for

rows[rowcount][i - 1] = ing;

rowcount++;

}

<>;

} catch {

tackTrace<>;

}

return rows;

}

}

package mydb;

import .*;

.*;

import .*;

publicclassMainFrmextends JFrame {

privatevoid initMenu<> {

JMenuBar bar = new JMenuBar<>;

JMenu m1 = new JMenu<"学生管理">;

JMenu m2 = new JMenu<"课程管理">;

JMenuItem m11 = new JMenuItem<"学生信息管理">;

JMenuItem m12 = new JMenuItem<"增加学生">;

JMenuItem m13 = new JMenuItem<"退出">;

ionListener{

publicvoid actionPerformed {

exit_Clicked<>;

}

}>;

ionListener {

publicvoid actionPerformed {

newSubFrm_Clicked<>;

}

}>;

ionListener {

publicvoid actionPerformed {

newAddFrm_Clicked<>;

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.

}

}>;

;

;

arator<>;

;

;

;

nuBar;

}

privatevoid newSubFrm_Clicked<> {

new StudentFrm<>;

}

privatevoid newAddFrm_Clicked<> {

new AddStudent<>;

}

privatevoid exit_Clicked<> {

if ==

_OPTION>

<0>;

}

public MainFrm<> {

JPanel jp = tentPane<>;

initMenu<>;

e<1000, 600>;

ible;

aultCloseOperation<_ON_CLOSE>;

}

publicstaticvoid main {

new MainFrm<>;

}

}

package mydb;

import .*;

import tTableModel;

import .*;

import .*;

publicclassStudentFrmextends JFrame {

private JTable table = null;

private String[] cols = { "学号", "", "专业", "是否有资格" };

private JButton deleteBtn = new JButton<"删除">;

private StudentDao studentDao = new StudentDao<>;

privatevoid initTable<> {

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.

String[][] rows = tudents<>;

for

if <"0".equals>

else

rows[i][3] = "有资格";

rows[i][3] = "无资格";

table = new JTable;

}

privatevoid updateTable<> {

String[][] rows = tudents<>;

for

if <"0".equals>

else

rows[i][3] = "有资格";

rows[i][3] = "无资格";

el>;

}

privatebooleanisCellEditable{

returntrue;

}

privatevoid deleteBtn_Clicked<> {

int row = ectedRow<>;

if -1> {

String sno = ueAt;

StudentBySno;

ssageDialog;

updateTable<>;

}

}

public StudentFrm<> {

JPanel jp = tentPane<>;

initTable<>;

JScrollPane jsp_table = new JScrollPane