import java.awt.*;
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import java.awt.event.*;
import javax.swing.*;
public class Frame
extends JFrame {
JTextField text;
JLabel nowBomb, setBomb;
int BombNum, BlockNum; // 当前雷数,当前方块数
int rightBomb, restBomb, restBlock; // 找到的地雷数，剩余雷数，剩余方块数
JButton start = new JButton(" 开始 ");
JPanel MenuPamel = new JPanel();
JPanel bombPanel = new JPanel();
Bomb[][] bombButton;
JPanel c;
BorderLayout borderLayout1 = new BorderLayout();
GridLayout gridLayout1 = new GridLayout();
public Frame() {
try {
setDefaultCloseOperation(EXIT_ON_CLOSE);
jbInit();
}
catch (Exception exception) {
exception.printStackTrace();
}
}
private void jbInit() throws Exception {
c = (JPanel) getContentPane();
setTitle("扫雷");
c.setBackground(Color.WHITE);
MenuPamel.setBackground(Color.GRAY);
c.setLayout(borderLayout1);
setSize(new Dimension(600, 600));
setResizable(false);
BlockNum = 144;
BombNum = 10;
text = new JTextField("10 ", 3);
nowBomb = new JLabel("当前雷数" + ":" + BombNum);
setBomb = new JLabel("设置地雷数");
start.addActionListener(new Frame1_start_actionAdapter(this));
MenuPamel.add(setBomb);
MenuPamel.add(text);
MenuPamel.add(start);
MenuPamel.add(nowBomb);
c.add(MenuPamel, java.awt.BorderLayout.SOUTH);
bombPanel.setLayout(gridLayout1);
gridLayout1.setColumns( (int) Math.sqrt(BlockNum));
gridLayout1.setRows( (int) Math.sqrt(BlockNum));
bombButton = new Bomb[ (int) Math.sqrt(BlockNum)][ (int) Math.sqrt(BlockNum)];
for (int i = 0; i (int) Math.sqrt(BlockNum); i++) {
for (int j = 0; j (int) Math.sqrt(BlockNum); j++) {
bombButton[i][j] = new Bomb(i, j);
//bombButton[i][j].setSize(10, 10);
bombButton[i][j].setFont(new Font("", Font.PLAIN, 14));//设置字体大小
bombButton[i][j].setForeground(Color.white);
bombButton[i][j].addMouseListener(new Bomb_mouseAdapter(this));
bombButton[i][j].addActionListener(new Bomb_actionAdapter(this));
bombPanel.add(bombButton[i][j]);
}
}
c.add(bombPanel, java.awt.BorderLayout.CENTER);
startBomb();
}
/* 开始按钮 */
public void start_actionPerformed(ActionEvent e) {
int num=Integer.parseInt(text.getText().trim());
if (num = 5 num 50) {
BombNum = num;
startBomb();
}
else if (num 5) {
JOptionPane.showMessageDialog(null, "您设置的地雷数太少了,请重设!", "错误",
JOptionPane.ERROR_MESSAGE);
num=10;
BombNum = num;
}
else {
JOptionPane.showMessageDialog(null, "您设置的地雷数太多了,请重设!", "错误",
JOptionPane.ERROR_MESSAGE);
num=10;
BombNum = num;
}
}
/* 开始,布雷 */
public void startBomb() {
nowBomb.setText("当前雷数" + "：" + BombNum);
for (int i = 0; i (int) Math.sqrt(BlockNum); i++) {
for (int j = 0; j (int) Math.sqrt(BlockNum); j++) {
bombButton[i][j].isBomb = false;
bombButton[i][j].isClicked = false;
bombButton[i][j].isRight = false;
bombButton[i][j].BombFlag = 0;
bombButton[i][j].BombRoundCount = 9;
bombButton[i][j].setEnabled(true);
bombButton[i][j].setText("");
bombButton[i][j].setFont(new Font("", Font.PLAIN, 14));//设置字体大小
bombButton[i][j].setForeground(Color.BLUE);
rightBomb = 0;
restBomb = BombNum;
restBlock = BlockNum - BombNum;
}
}
for (int i = 0; i BombNum; ) {
int x = (int) (Math.random() * (int) (Math.sqrt(BlockNum) - 1));
int y = (int) (Math.random() * (int) (Math.sqrt(BlockNum) - 1));
if (bombButton[x][y].isBomb != true) {
bombButton[x][y].isBomb = true;
i++;
}
}
CountRoundBomb();
}
/* 计算方块周围雷数 */
public void CountRoundBomb() {
for (int i = 0; i (int) Math.sqrt(BlockNum); i++) {
for (int j = 0; j (int) Math.sqrt(BlockNum); j++) {
int count = 0;
// 当需要检测的单元格本身无地雷的情况下,统计周围的地雷个数
if (bombButton[i][j].isBomb != true) {
for (int x = i - 1; x i + 2; x++) {
for (int y = j - 1; y j + 2; y++) {
if ( (x = 0) (y = 0)
(x ( (int) Math.sqrt(BlockNum)))
(y ( (int) Math.sqrt(BlockNum)))) {
if (bombButton[x][y].isBomb == true) {
count++;
}
}
}
}
bombButton[i][j].BombRoundCount = count;
}
}
}
}
/* 是否挖完了所有的雷 */
public void isWin() {
restBlock = BlockNum - BombNum;
for (int i = 0; i (int) Math.sqrt(BlockNum); i++) {
for (int j = 0; j (int) Math.sqrt(BlockNum); j++) {
if (bombButton[i][j].isClicked == true) {
restBlock--;
}
}
}
if (rightBomb == BombNum || restBlock == 0) {
JOptionPane.showMessageDialog(this, "您挖完了所有的雷，您胜利了!", "胜利",
JOptionPane.INFORMATION_MESSAGE);
startBomb();
}
}
/** 当选中的位置为空,则翻开周围的地图* */
public void isNull(Bomb ClickedButton) {
int i, j;
i = ClickedButton.num_x;
j = ClickedButton.num_y;
for (int x = i - 1; x i + 2; x++) {
for (int y = j - 1; y j + 2; y++) {
if ( ( (x != i) || (y != j)) (x = 0) (y = 0)
(x ( (int) Math.sqrt(BlockNum)))
(y ( (int) Math.sqrt(BlockNum)))) {
if (bombButton[x][y].isBomb == false
bombButton[x][y].isClicked == false
bombButton[x][y].isRight == false) {
turn(bombButton[x][y]);
}
}
}
}
}
/* 翻开 */
public void turn(Bomb ClickedButton) {
ClickedButton.setEnabled(false);
ClickedButton.isClicked = true;
if (ClickedButton.BombRoundCount 0) {
ClickedButton.setText(ClickedButton.BombRoundCount + "");
}
else {
isNull(ClickedButton);
}
}
/* 左键点击 */
public void actionPerformed(ActionEvent e) {
if ( ( (Bomb) e.getSource()).isClicked == false
( (Bomb) e.getSource()).isRight == false) {
if ( ( (Bomb) e.getSource()).isBomb == false) {
turn( ( (Bomb) e.getSource()));
isWin();
}
else {
for (int i = 0; i (int) Math.sqrt(BlockNum); i++) {
for (int j = 0; j (int) Math.sqrt(BlockNum); j++) {
if (bombButton[i][j].isBomb == true) {
bombButton[i][j].setText("b");
}
}
}
( (Bomb) e.getSource()).setForeground(Color.RED);
( (Bomb) e.getSource()).setFont(new Font("", Font.BOLD, 20));
( (Bomb) e.getSource()).setText("X");
JOptionPane.showMessageDialog(this, "你踩到地雷了，按确定重来", "踩到地雷", 2);
startBomb();
}
}
}
/* 右键点击 */
public void mouseClicked(MouseEvent e) {
Bomb bombSource = (Bomb) e.getSource();
boolean right = SwingUtilities.isRightMouseButton(e);
if ( (right == true) (bombSource.isClicked == false)) {
bombSource.BombFlag = (bombSource.BombFlag + 1) % 3;
if (bombSource.BombFlag == 1) {
if (restBomb 0) {
bombSource.setForeground(Color.RED);
bombSource.setText("F");
bombSource.isRight = true;
restBomb--;
}
else {
bombSource.BombFlag = 0;
}
}
else if (bombSource.BombFlag == 2) {
restBomb++;
bombSource.setText("Q");
bombSource.isRight = false;
}
else {
bombSource.setText("");
}
if (bombSource.isBomb == true) {
if (bombSource.BombFlag == 1) {
rightBomb++;
}
else if (bombSource.BombFlag == 2) {
rightBomb--;
}
}
nowBomb.setText("当前雷数" + ":" + restBomb);
isWin();
}
}
public static void main(String[] args) {
Frame frame = new Frame();
frame.setVisible(true);
}
}
class Frame1_start_actionAdapter
implements ActionListener {
private Frame adaptee;
Frame1_start_actionAdapter(Frame adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent e) {
adaptee.start_actionPerformed(e);
}
}
////////////////////////////
class Bomb
extends JButton {
int num_x, num_y; // 第几号方块
int BombRoundCount; // 周围雷数
boolean isBomb; // 是否为雷
boolean isClicked; // 是否被点击
int BombFlag; // 探雷标记
boolean isRight; // 是否点击右键
public Bomb(int x, int y) {
num_x = x;
num_y = y;
BombFlag = 0;
BombRoundCount = 9;
isBomb = false;
isClicked = false;
isRight = false;
}
}
class Bomb_actionAdapter
implements ActionListener {
private Frame adaptee;
Bomb_actionAdapter(Frame adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent e) {
adaptee.actionPerformed(e);
}
}
class Bomb_mouseAdapter
extends MouseAdapter {
private Frame adaptee;
Bomb_mouseAdapter(Frame adaptee) {
this.adaptee = adaptee;
}
public void mouseClicked(MouseEvent e) {
adaptee.mouseClicked(e);
}
}
您好，写了一个程序，求素数，并将所有素数存到ArrayList sushu中：
import java.util.ArrayList;
import java.util.zip.Inflater;
public class sushu {
public static void main(String[] args) {
int n=50,b=0;
float a=0,c=0;
ArrayList sushu=new ArrayList();
for(int i=3;i=n;i++){
int state=0;
for(int j=2;j(i/2+1);j++){
a=(float)i/(float)j;
//System.out.println(a);
b=(int)a;
//System.out.println(a-b);
c=a-b;
//System.out.println(c);
if(c==0){state=1;break;}
}
if(state==0)sushu.add(i);
}
System.out.println(sushu);
}
}
输出结果为：[3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]
上面 wuzhikun12同学写的不错，但我想还不能运行，并且还不太完善。我给个能运行的：（注意：文件名为：Test.java)
//要实现对象间的比较，就必须实现Comparable接口，它里面有个compareTo方法
//Comparable最好使用泛型，这样，无论是速度还是代码量都会减少
@SuppressWarnings("unchecked")
class Student implements ComparableStudent{
private String studentNo; //学号
private String studentName; //姓名
private double englishScore; //英语成绩
private double computerScore; //计算机成绩
private double mathScore; //数学成绩
private double totalScore; //总成绩
//空构造函数
public Student() {}
//构造函数
public Student(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {
this.studentNo = studentNo;
this.studentName = studentName;
this.englishScore = englishSocre;
this点抗 puterScore = computerScore;
this.mathScore = mathScore;
}
//计算总成绩
public double sum() {
this.totalScore = englishScore+computerScore+mathScore;
return totalScore;
}
//计算评测成绩
public double testScore() {
return sum()/3;
}
//实现compareTO方法
@Override
public int compareTo(Student student) {
double studentTotal = student.getTotalScore();
return totalScore==studentTotal?0:(totalScorestudentTotal?1:-1);
}
//重写toString方法
public String toString(){
return "学号："+this.getStudentNo()+" 姓名："+this.getStudentName()+" 英语成绩："+this.getEnglishScore()+" 数学成绩："+this.getMathScore()+" 计算机成绩："+this.getComputerScore()+" 总成绩："+this.getTotalScore();
}
//重写equals方法
public boolean equals(Object obj) {
if(obj == null){
return false;
}
if(!(obj instanceof Student)){
return false;
}
Student student = (Student)obj;
if(this.studentNo.equals(student.getStudentName())) { //照现实来说，比较是不是同一个学生，应该只是看他的学号是不是相同
return true;
} else {
return false;
}
}
/*以下为get和set方法，我个人认为，totalScore的set的方法没必要要，因为它是由其它成绩计算出来的
在set方法中，没设置一次值，调用一次sum方法，即重新计算总成绩
*/
public String getStudentNo() {
return studentNo;
}
public void setStudentNo(String studentNo) {
this.studentNo = studentNo;
sum();
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
sum();
}
public double getEnglishScore() {
return englishScore;
}
public void setEnglishScore(double englishScore) {
this.englishScore = englishScore;
sum();
}
public double getComputerScore() {
return computerScore;
}
public void setComputerScore(double computerScore) {
this点抗 puterScore = computerScore;
sum();
}
public double getMathScore() {
return mathScore;
}
public void setMathScore(double mathScore) {
this.mathScore = mathScore;
sum();
}
public double getTotalScore() {
return totalScore;
}
}
//Student子类学习委员类的实现
class StudentXW extends Student {
//重写父类Student的testScore()方法
@Override
public double testScore() {
return sum()/3+3;
}
public StudentXW() {}
//StudentXW的构造函数
public StudentXW(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {
super(studentNo,studentName,englishSocre,computerScore,mathScore);
}
}
//Student子类班长类的实现
class StudentBZ extends Student {
//重写父类Student的testScore()方法
@Override
public double testScore() {
return sum()/3+5;
}
public StudentBZ() {}
//StudentXW的构造函数
public StudentBZ(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {
super(studentNo,studentName,englishSocre,computerScore,mathScore);
}
}
//测试类
public class Test {
public static void main(String[] args) {
//生成若干个student类、StudentXW类、StudentBZ类
Student student1 = new Student("s001","张三",70.5,50,88.5);
Student student2 = new Student("s002","李四",88,65,88.5);
Student student3 = new Student("s003","王五",67,77,90);
StudentXW student4 = new StudentXW("s004","李六",99,88,99.5);
StudentBZ student5 = new StudentBZ("s005","朱漆",56,65.6,43.5);
Student[] students = {student1,student2,student3,student4,student5};
for(int i = 0 ; istudents.length; i++){
double avgScore = students[i].testScore();
System.out.println(students[i].getStudentName()+"学生的评测成绩为："+ avgScore+"分");
}
}
}
运行结果为：
张三学生的评测成绩为：69.66666666666667分
李四学生的评测成绩为：80.5分
王五学生的评测成绩为：78.0分
李六学生的评测成绩为：98.5分
朱漆学生的评测成绩为：60.03333333333333分