创建一个窗体，在其上显示如下图案。文字要求：颜色为绿色，字号大小20，字体类型隶书，外圆直径35，内圆直径为25 (p2/Circle.java)。
package p2;
import java.awt.*;public class text2 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame f=new Frame();
f.setSize(500,200);
MyPanel mp=new MyPanel();
f.add(mp);
f.setVisible(true);
}}
class MyPanel extends Panel{
public void paint(Graphics g){
g.setColor(Color.green);
g.setFont(new Font("隶书",0,20));
g.drawString("两个同心圆", 50, 50);
g.drawOval(230, 70, 35, 35);
g.drawOval(235, 75, 25, 25);
}
}

利用Java的多线程技术完成矩形框中蓝色实心小球的滚动问题。要求：在界面中有一个矩形框，实心小球起始位置在矩形框底边，向右滚动，到达矩形框右端停下，如下图(p3/Rect.java)。
package p3;
import java.awt.*;
public class text3 {
public static void main(String[] args) {
Frame f=new Frame();
f.setSize(300,400);
MyPanel mp=new MyPanel();
f.add(mp);
Thread t=new Thread(mp);
t.start();
f.setVisible(true);
}
}
class MyPanel extends Panel implements Runnable{
int x=60,y=130;
Boolean flag=true;
public void paint(Graphics g){
if(flag)
g.drawString("正在努力加载", 30,30);
else
g.drawString("加载完成", 30, 30);
g.setColor(Color.blue);
g.fillOval(x, y, 30, 30);
g.setColor(Color.black);
g.drawRect(60,130, 160, 30);
}
@Override
public void run() {
// TODO Auto-generated method stub
while(true){
x++;
if(x>=190){
flag=false;
break;
}
try{
Thread.sleep(30);
}catch(InterruptedException e){
e.printStackTrace();
}
repaint();
}
}
}

利用Java的多线程技术完成进度条显示。要求：界面初始时，进度条为空，并显示正在努力加载，几秒钟后，进度条显示满格，并显示加载完成,如下图(p4/Progress_bar.java)。
package p4;
import java.awt.*;
public class text4 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame f=new Frame();
f.setSize(300,400);
MyPanel mp=new MyPanel();
f.add(mp);
Thread t=new Thread(mp);
t.start();
f.setVisible(true);
}
}
class MyPanel extends Panel implements Runnable{
Boolean flag=true;
int x=0;
public void paint(Graphics g){
if(flag)
g.drawString("正在努力加载", 30,30);
else
g.drawString("加载完成", 30, 30);
g.setColor(Color.blue);
g.drawOval(90, 90, 100, 100);
g.fillArc(90, 90, 100, 100, 30, x);
}
@Override
public void run() {
// TODO Auto-generated method stub
while(true){
x-=5;
if(x<=-360){
flag=false;
break;
}
try{
Thread.sleep(80);
}catch(InterruptedException e){
e.printStackTrace();
}
repaint();
}
}
}

实现简易计算器，在前两个文本框输入数字，点击按钮实现相应运算并将结果显示在第三个文本框内，如下图。(p5/ Calculator.java)。
package p5;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator implements ActionListener{
JFrame f=new JFrame();
JLabel l1=new JLabel("第一个数：");
JLabel l2=new JLabel("第二个数：");
JLabel l3=new JLabel("运行结果：");
JTextField t1=new JTextField();
JTextField t2=new JTextField();
JTextField t3=new JTextField();
JPanel text=new JPanel();
JButton multiple=new JButton("相加");
JButton subtraction=new JButton("相减");
JPanel button=new JPanel();
public Calculator() {
// TODO Auto-generated constructor stub
f.setSize(300,200);
f.setLocation(300, 300);
text.setLayout(new GridLayout(3,2));
text.add(l1);
text.add(t1);
text.add(l2);
text.add(t2);
text.add(l3);
text.add(t3);
button.setLayout(new FlowLayout());
button.add(multiple);
button.add(subtraction);
f.setLayout(new BorderLayout());
f.add(text,BorderLayout.CENTER);
f.add(button,BorderLayout.SOUTH);
multiple.addActionListener(this);
subtraction.addActionListener(this);
f.setVisible(true);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Calculator s=new Calculator();
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
int n=Integer.parseInt(t1.getText());
int m=Integer.parseInt(t2.getText());
if(e.getActionCommand().equals("相加")){
t3.setText(""+(m+n));
}
if(e.getActionCommand().equals("相减")){
t3.setText(""+(n-m));
}
}
}

1、
package java_exam;
import java.awt.*;
public class a1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame f=new Frame();
f.setSize(500,400);
Mypanel my=new Mypanel();
f.add(my);
f.setVisible(true);
}
}
class Mypanel extends Panel{
public void paint(Graphics g){
g.setFont(new Font("宋体", 0, 30));
g.setColor(Color.blue);
g.drawString("地址：长春工业大学人文信息学院", 0, 50);
g.drawString("计算机科学与工程", 0, 100);
g.drawString("邮编：130122", 0, 150);
}
}
----------------------------------------------------------------------------------------------------
2、
package p2;
import java.awt.*;
public class a2 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame f=new Frame();
f.setSize(400,300);
//f.setLocation(500, 500);
Mypanel md=new Mypanel();
f.add(md);
f.setVisible(true);
}
}
class Mypanel extends Panel{
public void paint(Graphics g){
g.setFont(new Font("隶书", 0, 20));
g.setColor(Color.green);
g.drawString("两个同心圆", 100, 150);
g.setColor(Color.green);
g.drawOval(225,175 , 35, 35);
g.drawOval(230,180 , 25, 25);
}
}
----------------------------------------------------------------------------------------------------
3、
package p3;
import java.awt.*;
public class a3 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame f=new Frame();
f.setSize(300,500);
Mypanel my=new Mypanel();
f.add(my);
Thread t=new Thread(my);
t.start();
f.setVisible(true);
}
}
class Mypanel extends Panel implements Runnable{
//@Override
int x=60;
int y=130;
Boolean flag=true;
public void paint(Graphics g){
if(flag==true)
g.drawString("正在加载中", 30, 30);
else
g.drawString("加载完成", 30, 30);
g.setColor(Color.blue);
g.fillOval(x, y, 30, 30);
g.setColor(Color.gray);
g.drawRect(60,130 , 160, 30);
}
public void run() {
// TODO Auto-generated method stub
while(true){
x+=3;
if(x>190){
flag=false;

break;
}
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
repaint();
}
}
}
----------------------------------------------------------------------------------------------------
4、
package p4;
import java.awt.*;
public class a4 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame f=new Frame();
f.setSize(300,300);
Mypanel my=new Mypanel();
f.add(my);
Thread t=new Thread(my);
t.start();
f.setVisible(true);
}
}
class Mypanel extends Panel implements Runnable{
//@Override
int x=0;
boolean flag=true;
public void paint(Graphics g){
if(flag)
g.drawString("正在加载中", 30, 30);
else
g.drawString("加载完成", 30, 30);
g.setColor(Color.blue);
g.drawOval(90, 90, 100, 100);
g.fillArc(90, 90, 100, 100, 30,x );
}
public void run() {
// TODO Auto-generated method stub
while(true){
x-=3;
if(x<=-360){
flag=false;
break;
}
try {
Thread.sleep(80);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
repaint();
}
}
}

5、
package p5;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Cal implements ActionListener{
/**
* @param args
*/
JFrame jf=new JFrame();
JLabel l1=new JLabel("第一个数");
JLabel l2=new JLabel("第二个数");
JLabel l3=new JLabel("运行结果");
JTextField num1=new JTextField();
JTextField num2=new JTextField();
JTextField num3=new JTextField();
JPanel text=new JPanel();
JButton jia=new JButton("相加");
JButton jian=new JButton("相减");
JPanel button=new JPanel();
public Cal(){
jf.setSize(300,200);
jf.setLocation(300,300);
text.setLayout(new GridLayout(3, 2));
text.add(l1);
text.add(num1);
text.add(l2);
text.add(num2);
text.add(l3);
text.add(num3);
button.add(jia);
button.add(jian);
jf.add(text,BorderLayout.CENTER);
jf.add(button,BorderLayout.SOUTH);
jia.addActionListener(this);
jian.addActionListener(this);
jf.setVisible(true);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Cal s=new Cal();
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
int m=Integer.parseInt(num1.getText());
int n=Integer.parseInt(num2.getText());
if(e.getActionCommand().equals("相加")){
num3.setText(""+(m+n));
}
if(e.getActionCommand().equals("相减")){
num3.setText(""+(m-n));
}
}
}

package p6;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
public class Main_Page extends JFrame implements ActionListener{
JLabel l1=new JLabel("城市名称");
JLabel l2=new JLabel("人口数量（万）");
JLabel l3=new JLabel("城区面积（平方公里）");
JLabel l4=new JLabel("国内生产总值（亿元）");
JButton b1=new JButton("查询");
JButton b2=new JButton("取消");
JTextField jc=new JTextField();
JTextField jp=new JTextField();
JTextField ja=new JTextField();
JTextField jg=new JTextField();
JPanel p1=new JPanel();
JPanel p2=new JPanel();
Main_Page(){
this.setSize(360,260);
this.setLocation(300,300);
p1.setLayout(new GridLayout(4,2));
p1.add(l1);
p1.add(jc);
p1.add(l2);
p1.add(jp);
p1.add(l3);
p1.add(ja);
p1.add(l4);
p1.add(jg);
p2.add(b1);
p2.add(b2);
this.add(p1,BorderLayout.CENTER);
this.add(p2,BorderLayout.SOUTH);
b1.addActionListener(this);
b2.addActionListener(this);
}
public static void main(String[] args) {
Main_Page s=new Main_Page();
s.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("查询")){
String city=jc.getText();
try {
Class.forName("org.gjt.mm.mysql.Driver");
Connection cn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/city","root","");
PreparedStatement ps=cn.prepareStatement("select * from city where cityname=?");
ps.setString(1, city);
ResultSet rs=ps.executeQuery();
if(rs.next()){
jp.setText(rs.getString(2));
ja.setText(rs.getString(3));
jg.setText(rs.getString(4));
}
rs.close();
ps.close();
cn.close();
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if(e.getActionCommand().equals("取消")){
System.exit(0);
}
}
}