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找到了，很久以前写的一个简单画图，呵呵～当时要求用AWT写，很难受。
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package net.miqiang.gui;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
/**
* 简单画图板程序
* 好久没用 AWT 了，写起来真别扭，如果用 swing 会很舒服，有空再改写吧。
*
* @author 米强
*
*/
public class TestMain extends Frame {
// 画板
private Palette palette = null;
// 显示当前颜色的面板
private Panel nonceColor = null;
// 画笔粗细
private Label drawWidth = null;
// 画笔端点的装饰
private Label drawCap = null;
// 选取颜色按钮的监听事件类
private ButtonColorAction buttonColorAction = null;
// 鼠标进入按钮后光标样式的监听事件类
private ButtonCursor buttonCursor = null;
// 画笔样式的监听事件
private ButtonStrokeAction buttonStrokeAction = null;
/**
* 构造方法
*
*/
public TestMain() {
// 设置标题栏文字
super("简易画图板");
// 构造一个画图板
palette = new Palette();
Panel pane = new Panel(new GridLayout(2, 1));
// 画笔颜色选择器
Panel paneColor = new Panel(new GridLayout(1, 13));
// 12 个颜色选择按钮
Button [] buttonColor = new Button[12];
Color [] color = {Color.black, Color.blue, Color.cyan, Color.darkGray, Color.gray, Color.green, Color.magenta, Color.orange, Color.pink, Color.red, Color.white, Color.yellow};
// 显示当前颜色的面板
nonceColor = new Panel();
nonceColor.setBackground(Color.black);
paneColor.add(nonceColor);
buttonColorAction = new ButtonColorAction();
buttonCursor = new ButtonCursor();
for(int i = 0; i buttonColor.length; i++){
buttonColor[i] = new Button();
buttonColor[i].setBackground(color[i]);
buttonColor[i].addActionListener(buttonColorAction);
buttonColor[i].addMouseListener(buttonCursor);
paneColor.add(buttonColor[i]);
}
pane.add(paneColor);
// 画笔颜色选择器
Panel paneStroke = new Panel(new GridLayout(1, 13));
// 控制画笔样式
buttonStrokeAction = new ButtonStrokeAction();
Button [] buttonStroke = new Button[11];
buttonStroke[0] = new Button("1");
buttonStroke[1] = new Button("3");
buttonStroke[2] = new Button("5");
buttonStroke[3] = new Button("7");
buttonStroke[4] = new Button("9");
buttonStroke[5] = new Button("11");
buttonStroke[6] = new Button("13");
buttonStroke[7] = new Button("15");
buttonStroke[8] = new Button("17");
buttonStroke[9] = new Button("■");
buttonStroke[10] = new Button("●");
drawWidth = new Label("3", Label.CENTER);
drawCap = new Label("●", Label.CENTER);
drawWidth.setBackground(Color.lightGray);
drawCap.setBackground(Color.lightGray);
paneStroke.add(drawWidth);
for(int i = 0; i buttonStroke.length; i++){
paneStroke.add(buttonStroke[i]);
buttonStroke[i].addMouseListener(buttonCursor);
buttonStroke[i].addActionListener(buttonStrokeAction);
if(i = 8){
buttonStroke[i].setName("width");
}else{
buttonStroke[i].setName("cap");
}
if(i == 8){
paneStroke.add(drawCap);
}
}
pane.add(paneStroke);
// 将画笔颜色选择器添加到窗体中
this.add(pane, BorderLayout.NORTH);
// 将画图板添加到窗体中
this.add(palette);
// 添加窗口监听，点击关闭按钮时退出程序
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// 设置窗体 ICON 图标
this.setIconImage(Toolkit.getDefaultToolkit().createImage("images/palette.png"));
// 设置窗口的大小
this.setSize(new Dimension(400, 430));
// 设置窗口位置，处于屏幕正中央
this.setLocationRelativeTo(null);
// 显示窗口
this.setVisible(true);
}
/**
* 程序入口
*
* @param args
* 字符串数组参数
*/
public static void main(String[] args) {
new TestMain();
}
/**
* 选取颜色按钮的监听事件类
* @author 米强
*
*/
class ButtonColorAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
Color color_temp = ((Button)e.getSource()).getBackground();
nonceColor.setBackground(color_temp);
palette.setColor(color_temp);
}
}
/**
* 鼠标进入按钮变换光标样式监听事件类
* @author 米强
*
*/
class ButtonCursor extends MouseAdapter {
public void mouseEntered(MouseEvent e) {
((Button)e.getSource()).setCursor(new Cursor(Cursor.HAND_CURSOR));
}
public void mouseExited(MouseEvent e) {
((Button)e.getSource()).setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
}
/**
* 设置画笔的监听事件类
* @author 米强
*
*/
class ButtonStrokeAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
Button button_temp = (Button) e.getSource();
String name = button_temp.getName();
if(name.equalsIgnoreCase("width")){
drawWidth.setText(button_temp.getLabel());
palette.setStroke(Float.parseFloat(button_temp.getLabel()));
}else if(name.equalsIgnoreCase("cap")){
drawCap.setText(button_temp.getLabel());
if(button_temp.getLabel().equals("■")){
palette.setStroke(BasicStroke.CAP_SQUARE);
}else if(button_temp.getLabel().equals("●")){
palette.setStroke(BasicStroke.CAP_ROUND);
}
}
}
}
}
/**
* 画板类
*
* @author 米强
*
*/
class Palette extends Panel implements MouseListener, MouseMotionListener {
// 鼠标 X 坐标的位置
private int mouseX = 0;
// 上一次 X 坐标位置
private int oldMouseX = 0;
// 鼠标 Y 坐标的位置
private int mouseY = 0;
// 上一次 Y 坐标位置
private int oldMouseY = 0;
// 画图颜色
private Color color = null;
// 画笔样式
private BasicStroke stroke = null;
// 缓存图形
private BufferedImage image = null;
/**
* 构造一个画板类
*
*/
public Palette() {
this.addMouseListener(this);
this.addMouseMotionListener(this);
// 默认黑色画笔
color = new Color(0, 0, 0);
// 设置默认画笔样式
stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
// 建立 1280 * 1024 的 RGB 缓存图象
image = new BufferedImage(1280, 1024, BufferedImage.TYPE_INT_RGB);
// 设置颜色
image.getGraphics().setColor(Color.white);
// 画背景
image.getGraphics().fillRect(0, 0, 1280, 1024);
}
/**
* 重写 paint 绘图方法
*/
public void paint(Graphics g) {
super.paint(g);
// 转换为 Graphics2D
Graphics2D g2d = (Graphics2D) g;
// 获取缓存图形 Graphics2D
Graphics2D bg = image.createGraphics();
// 图形抗锯齿
bg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// 设置绘图颜色
bg.setColor(color);
// 设置画笔样式
bg.setStroke(stroke);
// 画线，从上一个点到新的点
bg.drawLine(oldMouseX, oldMouseY, mouseX, mouseY);
// 将缓存中的图形画到画板上
g2d.drawImage(image, 0, 0, this);
}
/**
* 重写 update 方法
*/
public void update(Graphics g) {
this.paint(g);
}
/**
* @return stroke
*/
public BasicStroke getStroke() {
return stroke;
}
/**
* @param stroke 要设置的 stroke
*/
public void setStroke(BasicStroke stroke) {
this.stroke = stroke;
}
/**
* 设置画笔粗细
* @param width
*/
public void setStroke(float width) {
this.stroke = new BasicStroke(width, stroke.getEndCap(), stroke.getLineJoin());
}
/**
* 设置画笔端点的装饰
* @param cap 参考 java.awt.BasicStroke 类静态字段
*/
public void setStroke(int cap) {
this.stroke = new BasicStroke(stroke.getLineWidth(), cap, stroke.getLineJoin());
}
/**
* @return color
*/
public Color getColor() {
return color;
}
/**
* @param color 要设置的 color
*/
public void setColor(Color color) {
this.color = color;
}
public void mouseClicked(MouseEvent mouseEvent) {
}
/**
* 鼠标按下
*/
public void mousePressed(MouseEvent mouseEvent) {
this.oldMouseX = this.mouseX = mouseEvent.getX();
this.oldMouseY = this.mouseY = mouseEvent.getY();
repaint();
}
public void mouseReleased(MouseEvent mouseEvent) {
}
/**
* 鼠标进入棋盘
*/
public void mouseEntered(MouseEvent mouseEvent) {
this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));
}
/**
* 鼠标退出棋盘
*/
public void mouseExited(MouseEvent mouseEvent) {
this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
/**
* 鼠标拖动
*/
public void mouseDragged(MouseEvent mouseEvent) {
this.oldMouseX = this.mouseX;
this.oldMouseY = this.mouseY;
this.mouseX = mouseEvent.getX();
this.mouseY = mouseEvent.getY();
repaint();
}
public void mouseMoved(MouseEvent mouseEvent) {
}
}
按照题目要求编写的Item父类的Java程序如下
public class Item{
private String goods;
private int unitperbox;
public Item(String goods,int unitperbox){
this.goods=goods;
this.unitperbox=unitperbox;
}
public String ShowGoods(){
return goods;
}
public int ShowUnitPerBox(){
return unitperbox;
}
}
按照你的要求编写的Java程序如下
public class CC {
public static void main(String[] args) {
int N=5;
for(int i=0;iN;i++){
for(int j=0;jN-i;j++){
System.out.print(" ");
}
for(int j=0;j=i;j++){
System.out.print((char)('a'+i)+" ");
}
System.out.println();
}
}
}
运行结果
我使用eclipse写的这个练习，首先给你截个图，抹掉的地方不是这个题的范畴，光标挡住的地方是ModelScore
然后，先是ModelScore代码：
package Models;
public class ModelScore {
private double mathScore;
private double englishScore;
private double javaScore;
private static final int type_Math = 0, type_English = 1, type_Java = 2;
public ModelScore(){
}
public int getNumberOfField(){
return 3;
}
public ModelScore(double mathScore, double englishScore, double javaScore){
this.mathScore = mathScore;
this.englishScore = englishScore;
this.javaScore = javaScore;
}
public double getMathScore(){
return this.mathScore;
}
public double getEnglishScore(){
return this.englishScore;
}
public double getJavaScore(){
return this.javaScore;
}
public void setMathScore(double mathScore){
this.mathScore = mathScore;
}
public void setEnglishScore(double englishScore){
this.englishScore = englishScore;
}
public void setJavaScore(double javaScore){
this.javaScore = javaScore;
}
public double getAverageScore(){
return (double)Math.round((this.mathScore + this.englishScore + this.javaScore) / 3 * 100) / 100;
}
public String toString(){
return "Scores:[Math: " + getMathScore() +
", English: " + getEnglishScore() + ", Java: " + getJavaScore() +
", AverageScore: " + getAverageScore() + "]";
}
public ModelScore clone(){
ModelScore score = new ModelScore();
score.setMathScore(this.getMathScore());
score.setEnglishScore(this.getEnglishScore());
score.setJavaScore(this.getJavaScore());
return score;
}
public double getScore(int type){
if(type == type_Math){
return mathScore;
}
if(type == type_English){
return englishScore;
}
if(type == type_Java){
return javaScore;
}
return 0;
}
}
然后是ModelStudent代码：
package Models;
public class ModelStudent {
private String studentID;
private String studentName;
private ModelScore score;
public ModelStudent(){
}
public ModelStudent(String studentID, String studentName, ModelScore score){
this.studentID = studentID;
this.studentName = studentName;
this.score = score.clone();
}
public String getStudentID(){
return this.studentID;
}
public String getStudentName(){
return this.studentName;
}
public ModelScore getStudentScore(){
return this.score.clone();
}
public void setStudentID(String studentID){
this.studentID = studentID;
}
public void setStudentName(String studentName){
this.studentName = studentName;
}
public void setStudentScore(ModelScore score){
this.score = score.clone();
}
public double getAverageScore(){
return score.getAverageScore();
}
public ModelStudent clone(){
ModelStudent student = new ModelStudent();
student.setStudentID(studentID);
student.setStudentName(studentName);
student.setStudentScore(score.clone());
return student;
}
public String toString(){
return "Student:[ ID: " + getStudentID() + ", Name: "
+ getStudentName() + ", " + getStudentScore() + "]";
}
public String getNameAndEverayScore(){
return "Name: " + studentName + ", average score: " + getAverageScore();
}
}
最后是主函数所在的类StudentScoreTester代码：
import java.util.ArrayList;
import java.util.Scanner;
import Models.ModelScore;
import Models.ModelStudent;
public class StudentScoreTester {
static final int type_Math = 0, type_English = 1, type_Java = 2 ;
public static void main(String[] args) throws NumberFormatException{
Scanner input = new Scanner(System.in);
String studentID = " ", studentName, searchedStudentName;
double studentMathScore, studentEnglishScore, studentJavaScore;
ModelScore studentScore;
ModelStudent student;
ArrayListModelStudent students = new ArrayListModelStudent();
ArrayListModelStudent studentsWithMaxMath, studentsWithMinMath;
ArrayListModelStudent studentsWithMaxEnglish, studentsWithMinEnglish;
ArrayListModelStudent studentsWithMaxJava, studentsWithMinJava;
ArrayListModelStudent searchedStudents;
double[] averageScores;
double averageScoreForMath, averageScoreForEnglish, averageScoreForJava;
double maxScoreForMath, maxScoreForEnglish, maxScoreForJava;
double minScoreForMath, minScoreForEnglish, minScoreForJava;
while(!studentID.equalsIgnoreCase("end")){
System.out.print("输入若干学生的学号，姓名，以及三科成绩（数学，英语，Java）， 以输入end作为结束输入：");
studentID = input.next();
if(studentID.equalsIgnoreCase("end")){
break;
}
studentName = input.next();
studentMathScore = Double.valueOf(input.next());
studentEnglishScore = Double.valueOf(input.next());
studentJavaScore = Double.valueOf(input.next());
studentScore = new ModelScore(studentMathScore, studentEnglishScore, studentJavaScore);
student = new ModelStudent(studentID, studentName, studentScore);
students.add(student);
}
System.out.println("*******************************");
System.out.println("计算出所有学生平均成绩，并以降序显示......");
sortByAverageScore(students);
for(ModelStudent everyStudent: students){
System.out.println(everyStudent.getNameAndEverayScore());
}
System.out.println("*******************************");
System.out.println("全组每科平均成绩......");
averageScores = calculateAverageScore(students);
averageScoreForMath = averageScores[type_Math];
averageScoreForEnglish = averageScores[type_English];
averageScoreForJava = averageScores[type_Java];
System.out.println("数学： " + averageScoreForMath);
System.out.println("英语： " + averageScoreForEnglish);
System.out.println("Java： " + averageScoreForJava);
System.out.println("*******************************");
System.out.println("每科最好以及最差成绩的学生......");
studentsWithMaxMath = findStudentWithMaxScore(students, type_Math);
studentsWithMinMath = findStudentWithMinScore(students, type_Math);
studentsWithMaxEnglish = findStudentWithMaxScore(students, type_English);
studentsWithMinEnglish = findStudentWithMinScore(students, type_English);
studentsWithMaxJava = findStudentWithMaxScore(students, type_Java);
studentsWithMinJava = findStudentWithMinScore(students, type_Java);
System.out.println(" #########################");
System.out.println("数学最高成绩......");
for(ModelStudent studentWithMaxMath: studentsWithMaxMath){
System.out.println(studentWithMaxMath.getStudentName() + ", " + studentWithMaxMath.getStudentScore().getScore(type_Math));
}
System.out.println("\n数学最低成绩......");
for(ModelStudent studentWithMinMath: studentsWithMinMath){
System.out.println(studentWithMinMath.getStudentName() + ", " + studentWithMinMath.getStudentScore().getScore(type_Math));
}
System.out.println(" #########################");
System.out.println("英语最高成绩......");
for(ModelStudent studentWithMaxEnglish: studentsWithMaxEnglish){
System.out.println(studentWithMaxEnglish.getStudentName() + ", " + studentWithMaxEnglish.getStudentScore().getScore(type_English));
}
System.out.println("\n英语最低成绩......");
for(ModelStudent studentWithMinEnglish: studentsWithMinEnglish){
System.out.println(studentWithMinEnglish.getStudentName() + ", " + studentWithMinEnglish.getStudentScore().getScore(type_English));
}
System.out.println(" #########################");
System.out.println("Java最高成绩......");
for(ModelStudent studentWithMaxJava: studentsWithMaxJava){
System.out.println(studentWithMaxJava.getStudentName() + ", " + studentWithMaxJava.getStudentScore().getScore(type_Java));
}
System.out.println("\nJava最低成绩......");
for(ModelStudent studentWithMinJava: studentsWithMinJava){
System.out.println(studentWithMinJava.getStudentName() + ", " + studentWithMinJava.getStudentScore().getScore(type_Java));
}
System.out.println("*******************************");
System.out.print("输入要查找的学生姓名： ");
input.nextLine();
searchedStudentName = input.nextLine();
searchedStudents = searchStudentsByName(students, searchedStudentName);
System.out.println("查找结果是......");
if(searchedStudents.size() != 0){
for(ModelStudent everyStudent: searchedStudents){
System.out.println(everyStudent);
}
}
else{
System.out.println("查无此学生");
}
}
public static void sortByAverageScore(ArrayListModelStudent students){
for(int i = 0; i students.size() - 1; i++){
for(int j = i; j students.size(); j++){
if(students.get(i).getAverageScore() students.get(j).getAverageScore()){
ModelStudent tempStudent = students.get(i);
students.set(i, students.get(j));
students.set(j, tempStudent);
}
}
}
}
public static double[] calculateAverageScore(ArrayListModelStudent students){
double[] averageScore = new double[students.get(0).getStudentScore().getNumberOfField()];
for(int i = 0; i students.size(); i++){
ModelStudent currentStudent = students.get(i);
averageScore[type_Math] += currentStudent.getStudentScore().getMathScore();
averageScore[type_English] += currentStudent.getStudentScore().getEnglishScore();
averageScore[type_Java] += currentStudent.getStudentScore().getJavaScore();
}
averageScore[type_Math] = (double)Math.round(averageScore[type_Math]/ students.size() * 100) / 100;
averageScore[type_English] = (double)Math.round(averageScore[type_English]/ students.size() * 100) / 100;
averageScore[type_Java] = (double)Math.round(averageScore[type_Java]/ students.size() * 100) / 100;
return averageScore;
}
public static ArrayListModelStudent findStudentWithMaxScore(ArrayListModelStudent students, int type){
ArrayListModelStudent studentsWithMaxScore = new ArrayListModelStudent();
ModelStudent studentWithMaxScore = students.get(0);
for(ModelStudent everyStudent: students){
if(studentWithMaxScore.getStudentScore().getScore(type) everyStudent.getStudentScore().getScore(type)){
studentWithMaxScore = everyStudent.clone();
}
}
for(ModelStudent everyStudent: students){
if(studentWithMaxScore.getStudentScore().getScore(type) == everyStudent.getStudentScore().getScore(type)){
studentsWithMaxScore.add(everyStudent);
}
}
return studentsWithMaxScore;
}
public static ArrayListModelStudent findStudentWithMinScore(ArrayListModelStudent students, int type){
ArrayListModelStudent studentsWithMaxScore = new ArrayListModelStudent();
ModelStudent studentWithMaxScore = students.get(0);
for(ModelStudent everyStudent: students){
if(studentWithMaxScore.getStudentScore().getScore(type) everyStudent.getStudentScore().getScore(type)){
studentWithMaxScore = everyStudent.clone();
}
}
for(ModelStudent everyStudent: students){
if(studentWithMaxScore.getStudentScore().getScore(type) == everyStudent.getStudentScore().getScore(type)){
studentsWithMaxScore.add(everyStudent);
}
}
return studentsWithMaxScore;
}
public static ArrayListModelStudent searchStudentsByName(ArrayListModelStudent students, String studentName){
ArrayListModelStudent resultStudents = new ArrayListModelStudent();
for(ModelStudent everyStudent: students){
if(everyStudent.getStudentName().equals(studentName)){
resultStudents.add(everyStudent);
}
}
return resultStudents;
}
}
final ImageView iv=(ImageView)findViewById(R.id.iv);
Button bt=(Button)findViewById(R.id.bt);
bt.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View p1)
{
// TODO: Implement this method
if(iv.getDrawable()!=null)
iv.setImageResource(R.id.photo);
else iv.setImageResource(0);
}
});