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package guxi.test;
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import java.util.ArrayList;
import java.util.List;
public class Stu {
public static void main(String[] args) {
ListStu 学校 = new ArrayListStu();
// 测试学生
学校.add(new Stu("张三", "No.1"));
学校.add(new Stu("李四", "No.2"));
学校.add(new Stu("王五", "No.3"));
学校.add(new Stu("赵六", "No.4"));
学校.add(new Stu("孙七", "No.5"));
for (int i = 0; i 学校.size(); i++) {
Stu stu = 学校.get(i);
if (i % 2 == 0) {
stu.上课();
} else {
stu.考试();
}
stu.study();
}
}
private static int 学生人数;
private String 学号;
private String 姓名;
private String 性别;
private String 年龄;
private String 专业;
private String 电子邮箱;
private String QQ;
private String 住址;
public Stu(String 姓名, String 学号) {
this.姓名 = 姓名;
this.学号 = 学号;
学生人数++;
System.out.println(姓名 + " 入学，学号：" + 学号 + " 当前学生人数：" + 学生人数);
}
public void 上课() {
System.out.println(姓名 + " 在上课");
}
public void 考试() {
System.out.println(姓名 + " 在考试");
}
public void study() {
System.out.println(姓名 + "，你要好好学习，天天向上");
}
public String get学号() {
return 学号;
}
public void set学号(String 学号) {
this.学号 = 学号;
}
public String get姓名() {
return 姓名;
}
public void set姓名(String 姓名) {
this.姓名 = 姓名;
}
public String get性别() {
return 性别;
}
public void set性别(String 性别) {
this.性别 = 性别;
}
public String get年龄() {
return 年龄;
}
public void set年龄(String 年龄) {
this.年龄 = 年龄;
}
public String get专业() {
return 专业;
}
public void set专业(String 专业) {
this.专业 = 专业;
}
public String get电子邮箱() {
return 电子邮箱;
}
public void set电子邮箱(String 电子邮箱) {
this.电子邮箱 = 电子邮箱;
}
public String getQQ() {
return QQ;
}
public void setQQ(String qQ) {
QQ = qQ;
}
public String get住址() {
return 住址;
}
public void set住址(String 住址) {
this.住址 = 住址;
}
public static int get学生人数() {
return 学生人数;
}
}
import java.awt.AWTException;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferedImage;
import java.awt.image.RescaleOp;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.filechooser.FileSystemView;
/**
* java截屏
* 运行后将当前屏幕截取，并最大化显示。
* 拖拽鼠标，选择自己需要的部分。
* 按Esc键保存图片到桌面，并退出程序。
* 点击右上角（没有可见的按钮），退出程序，不保存图片。
*
* @author JinCeon
*/
public class SnapshotTest {
public static void main(String[] args) {
// 全屏运行
RectD rd = new RectD();
GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice();
gd.setFullScreenWindow(rd);
}
}
class RectD extends JFrame {
private static final long serialVersionUID = 1L;
int orgx, orgy, endx, endy;
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
BufferedImage image;
BufferedImage tempImage;
BufferedImage saveImage;
Graphics g;
@Override
public void paint(Graphics g) {
RescaleOp ro = new RescaleOp(0.8f, 0, null);
tempImage = ro.filter(image, null);
g.drawImage(tempImage, 0, 0, this);
}
public RectD() {
snapshot();
setVisible(true);
// setSize(d);//最大化窗口
setDefaultCloseOperation(EXIT_ON_CLOSE);
this.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
orgx = e.getX();
orgy = e.getY();
}
});
this.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
endx = e.getX();
endy = e.getY();
g = getGraphics();
g.drawImage(tempImage, 0, 0, RectD.this);
int x = Math.min(orgx, endx);
int y = Math.min(orgy, endy);
int width = Math.abs(endx - orgx)+1;
int height = Math.abs(endy - orgy)+1;
// 加上1，防止width或height为0
g.setColor(Color.BLUE);
g.drawRect(x-1, y-1, width+1, height+1);
//减1，加1都是为了防止图片将矩形框覆盖掉
saveImage = image.getSubimage(x, y, width, height);
g.drawImage(saveImage, x, y, RectD.this);
}
});
this.addKeyListener(new KeyAdapter() {
@Override
public void keyReleased(KeyEvent e) {
// 按Esc键退出
if (e.getKeyCode() == 27) {
saveToFile();
System.exit(0);
}
}
});
}
public void saveToFile() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyymmddHHmmss");
String name = sdf.format(new Date());
File path = FileSystemView.getFileSystemView().getHomeDirectory();
String format = "jpg";
File f = new File(path + File.separator + name + "." + format);
try {
ImageIO.write(saveImage, format, f);
} catch (IOException e) {
e.printStackTrace();
}
}
public void snapshot() {
try {
Robot robot = new Robot();
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
image = robot.createScreenCapture(new Rectangle(0, 0, d.width,
d.height));
} catch (AWTException e) {
e.printStackTrace();
}
}
}
public static void printMax(){
int[][] ay = {{22,91,0,5},{33,21},{19,-1,28,88}};
ListInteger list = new ArrayList();
for (int[] x:ay){
for (int y:x){
list.add(y);
}
}
System.out.println(Collections.max(list));
}
public static void main(String[] args) {
printMax();
}
public class Test {//测试类
public static void main(String[] args) {
Student[] stus = new Student[5];
Student stu1 = new Student();
stu1.setAge(11);
stu1.setName("Zhang San");
stus[0] = stu1;
Student stu2 = new Student();
stu2.setAge(22);
stu2.setName("Li Si");
stus[1] = stu2;
Postgraduate p1 = new Postgraduate();
p1.setAge(33);
p1.setName("Wang Wu");
p1.setStudydirection("Computer");
stus[2] = p1;
Postgraduate p2 = new Postgraduate();
p2.setAge(44);
p2.setName("Zhao Liu");
p2.setStudydirection("English");
stus[3] = p1;
Undergraduate u1 = new Undergraduate();
u1.setAge(55);
u1.setName("Ma qi");
u1.setSpecialty("Maths");
stus[4] = u1;
for(int i = 0; i stus.length; i++){
stus[i].print();
System.out.println();
}
}
}
class Student {//学生类
private String name;
private int age;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void print(){
System.out.println("name: " + name);
System.out.println("Age: " + age);
}
}
class Undergraduate extends Student {//本科生类
private String specialty;
public String getSpecialty() {
return specialty;
}
public void setSpecialty(String specialty) {
this.specialty = specialty;
}
public void print(){
super.print();
System.out.println("specialty : " + specialty);
}
}
class Postgraduate extends Student {//研究生类Postgraduate
private String studydirection;
public String getStudydirection() {
return studydirection;
}
public void setStudydirection(String studydirection) {
this.studydirection = studydirection;
}
public void print(){
super.print();
System.out.println("studydirection: " + studydirection);
}
}
----------------
name: Zhang San
Age: 11
name: Li Si
Age: 22
name: Wang Wu
Age: 33
studydirection: Computer
name: Wang Wu
Age: 33
studydirection: Computer
name: Ma qi
Age: 55
specialty : Maths
public class JavaPractise {
public static void main(String[] args) {
JavaPractise o = new JavaPractise();
String str = "1342973451345";
String subStr = o.getMaxLengthAddPart(str);
System.out.println(subStr);
String binaryFlow = "000011110000011111";
String sameSubStr = o.getMaxSameSubStr(binaryFlow);
System.out.println(sameSubStr);
String letterFlow = "aaBBBcCCCCddddddEEEE";
String sameLettersSubStr = o.getMaxSameLettersSubStr(letterFlow);
System.out.println(sameLettersSubStr);
}
/**
* 校验字符串是否符合数字规范
* */
private boolean isNum(String str){
boolean result = true;
if(str.length() 1)
return false;
for(int i = 0 ; i str.length(); i ++){
if(str.charAt(i) '0' || str.charAt(i) '9')
return false;
}
return result;
}
private boolean isBinaryFlow(String binaryFlow){
boolean result = true;
if(binaryFlow.length() 1)
return false;
for(int i = 0 ; i binaryFlow.length(); i ++){
if(binaryFlow.charAt(i) != '0' binaryFlow.charAt(i) != '1')
return false;
}
return result;
}
private boolean isLetterFlow(String letterFlow){
boolean result = true;
if(letterFlow.length() 1)
return false;
for(int i = 0 ; i letterFlow.length(); i ++){
char cur = letterFlow.charAt(i);
if(!( ('z'= cur cur = 'a') || ('Z' = cur cur 'A') ) )
return false;
}
return result;
}
/**
* 获取最长增长数字的子串
* */
private String getMaxLengthAddPart(String str){
str = str.trim();
if(!isNum(str))
return "";
String temp = ""+str.charAt(0);
String maxSubStr = temp;
for(int i = 1; i str.length(); i++){
char curChar = str.charAt(i);
char lastChar = str.charAt(i-1);
if( curChar lastChar){
temp += curChar;
if(i != (str.length()-1))
continue;//如果当前节点为最后一个节点，那么强制进入下面环节，进行
}
maxSubStr = maxSubStr.length() temp.length() ? maxSubStr : temp;
temp = ""+curChar; //清空原数据，并从当前节点记录
}
return maxSubStr;
}
/**
* 二进制流最长字符串判定
* */
private String getMaxSameSubStr(String str){
str = str.trim();
if(!isBinaryFlow(str))
return "";
String temp = ""+str.charAt(0);
String maxSubStr = temp;
for(int i = 1; i str.length(); i++){
char curChar = str.charAt(i);
char lastChar = str.charAt(i-1);
if( curChar == lastChar){
temp += curChar;
if(i != (str.length()-1))
continue;//如果当前节点为最后一个节点，那么强制进入下面环节，进行
}
maxSubStr = maxSubStr.length() temp.length() ? maxSubStr : temp;
temp = ""+curChar; //清空原数据，并从当前节点记录
}
return maxSubStr;
}
/**
* 字符串的最长相同部分截取
* */
private String getMaxSameLettersSubStr(String str){
str = str.trim();
if(!isLetterFlow(str))
return "";
String temp = ""+str.charAt(0);
String maxSubStr = temp;
for(int i = 1; i str.length(); i++){
char curChar = str.charAt(i);
char lastChar = str.charAt(i-1);
if( curChar == lastChar){
temp += curChar;
if(i != (str.length()-1))
continue;//如果当前节点为最后一个节点，那么强制进入下面环节，进行
}
maxSubStr = maxSubStr.length() temp.length() ? maxSubStr : temp;
temp = ""+curChar; //清空原数据，并从当前节点记录
}
return maxSubStr;
}
}
运行结果如下：