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class Stack_Float
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{
float nums[];
int top;
Stack_Float()
{
nums = new float[50];
top = -1;
}
boolean IsEmpty()
{
if(top == -1)
return true;
else
return false;
}
float Pop_Stack()
{
if(top==-1)
{
return 0;
}
top--;
return nums[top + 1];
}
float GetTop()
{
return nums[top];
}
void Push_Stack(float num)
{
if(top == 49)
return;
top++;
nums[top] = num;
}
}
/*****************************************************************************/
class Stack_Char
{
char str[];
int top;
Stack_Char()
{
str = new char[50];
top = -1;
}
boolean IsEmpty()
{
if(top==-1)
return true;
else
return false;
}
void Push_Stack(char ch)
{
if(top == 49)
return;
top++;
str[top] = ch;
}
char Pop_Stack()
{
if(top == -1)
return '\0';
top--;
return str[top + 1];
}
char GetTop()
{
if(top == -1)
{
System.out.print("error");
System.exit(0);
}
return str[top];
}
}
/*****************************************************************************/
public class jisuanqi extends javax.swing.JFrame
{
String show = "";
public jisuanqi()
{
initComponents();
}
char[] TranSmit(char str[])
{
char houzhui[] = new char[50]; //存放后缀表达式的字符串
int i = 0,j = 0;
char c = str[i];
Stack_Char s = new Stack_Char(); //存放运算符的栈
while(c != '=') //对算术表达式扫描未结束时
{
if(c = '0' c = '9')
{
while(c = '0' c = '9')//数字直接入栈
{
houzhui[j]=c;
j++;
i++;
c=str[i];
}
houzhui[j]='#';//用#隔开数字
j++;
}
switch(c) //扫描到运算符时
{
case '+':
case '-':
case '*':
case '/':
if(s.IsEmpty() == true) //栈空,直接入栈
{
s.Push_Stack(c);
i++;
c=str[i];
break;
}
if(ComPare(s.GetTop(),c) == -1)
{
s.Push_Stack(c); //入栈
i++;
c=str[i];
break;
}
if(ComPare(s.GetTop(),c) == 1)
{
houzhui[j]=s.Pop_Stack();//出栈元素存入后缀表达式
j++;
break;
}
}
}
while(s.IsEmpty() != true)//把剩余的运算符直接出栈
{
houzhui[j]=s.Pop_Stack();
j++;
}
houzhui[j] = '=';//后缀表达式后面加 =
j++;
houzhui[j] = '\0';
j++;
return houzhui;
}
float Count(char str[])
{
Stack_Float s = new Stack_Float();//定义存放数字的栈
char c = str[0];
int i = 0,j = 0;
float result = 0,temp,left,right;
while(c != '=') //未扫描到 = 时
{
if(c = '0' c = '9')//扫描到数字
{
temp = 0;
while(c != '#')//未读到分隔符时
{
temp = temp * 10 + c - '0';
i++;
c = str[i];
}
s.Push_Stack(temp);//进栈
}
switch(c)//扫描到运算符时
{
case '+':
{
result = s.Pop_Stack() + s.Pop_Stack();//2个数字出栈相加
s.Push_Stack(result);//最后得数进栈
break;
}
case '-':
{
right = s.Pop_Stack();//右操作数出栈
left = s.Pop_Stack();//左操作数出栈
result = left - right;
s.Push_Stack(result);
break;
}
case '*':
{
result = s.Pop_Stack() * s.Pop_Stack();//2个数字出栈相乘
s.Push_Stack(result);
break;
}
case '/':
{
right = s.Pop_Stack();//右操作数出栈
left = s.Pop_Stack();//左操作数出栈
result = left / right;
s.Push_Stack(result);
break;
}
}
i++;
c = str[i];
}
return result;
}
int ComPare(char a,char b) //判断运算符的优先级函数
{
int s[][] =
{// 栈顶元素高于算术表达式中的元素时, 返回 1,否则返回 -1
{1,1,-1,-1},
{1,1,-1,-1},
{1,1,1,1},
{1,1,1,1},
};
char x1[]={'+','-','*','/'};//栈顶元素
char x2[]={'+','-','*','/'};//算术表达式中的元素
int k=0,m,n = 0;
for(m=0;m4;m++) //查找2个进行比较的运算符在表中的位置,并返回比较结果
{
for(n=0;n4;n++)
{
if(x1[m]==ax2[n]==b)
{
k=1;break; //找到比较结果后,跳出循环
}
}
if(k==1)
break;
}
return s[m][n];//返回比较结果
}
/*****************************************************************************/
@SuppressWarnings("unchecked")
// editor-fold defaultstate="collapsed" desc="Generated Code"//GEN-BEGIN:initComponents
private void initComponents() {
text = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6 = new javax.swing.JButton();
jButton7 = new javax.swing.JButton();
jButton8 = new javax.swing.JButton();
jButton9 = new javax.swing.JButton();
jButton10 = new javax.swing.JButton();
jButton11 = new javax.swing.JButton();
jButton12 = new javax.swing.JButton();
jButton13 = new javax.swing.JButton();
jButton14 = new javax.swing.JButton();
jButton21 = new javax.swing.JButton();
jButton22 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(null);
getContentPane().add(text);
text.setBounds(10, 10, 270, 30);
jButton1.setText("1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
getContentPane().add(jButton1);
jButton1.setBounds(10, 50, 60, 25);
jButton2.setText("2");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
getContentPane().add(jButton2);
jButton2.setBounds(80, 50, 60, 25);
jButton3.setText("3");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
getContentPane().add(jButton3);
jButton3.setBounds(150, 50, 60, 25);
jButton4.setText("4");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
getContentPane().add(jButton4);
jButton4.setBounds(220, 50, 60, 25);
jButton5.setText("5");
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton5ActionPerformed(evt);
}
});
getContentPane().add(jButton5);
jButton5.setBounds(10, 80, 60, 25);
jButton6.setText("6");
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton6ActionPerformed(evt);
}
});
getContentPane().add(jButton6);
jButton6.setBounds(80, 80, 60, 25);
jButton7.setText("7");
jButton7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton7ActionPerformed(evt);
}
});
getContentPane().add(jButton7);
jButton7.setBounds(150, 80, 60, 25);
jButton8.setText("8");
jButton8.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton8ActionPerformed(evt);
}
});
getContentPane().add(jButton8);
jButton8.setBounds(220, 80, 60, 25);
jButton9.setText("9");
jButton9.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton9ActionPerformed(evt);
}
});
getContentPane().add(jButton9);
jButton9.setBounds(10, 110, 60, 25);
jButton10.setText("0");
jButton10.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton10ActionPerformed(evt);
}
});
getContentPane().add(jButton10);
jButton10.setBounds(80, 110, 60, 25);
jButton11.setText("+");
jButton11.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton11ActionPerformed(evt);
}
});
getContentPane().add(jButton11);
jButton11.setBounds(150, 110, 60, 25);
jButton12.setText("-");
jButton12.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton12ActionPerformed(evt);
}
});
getContentPane().add(jButton12);
jButton12.setBounds(220, 110, 60, 25);
jButton13.setText("*");
jButton13.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton13ActionPerformed(evt);
}
});
getContentPane().add(jButton13);
jButton13.setBounds(10, 140, 60, 25);
jButton14.setText("/");
jButton14.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton14ActionPerformed(evt);
}
});
getContentPane().add(jButton14);
jButton14.setBounds(80, 140, 60, 25);
jButton21.setText("CE");
jButton21.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton21ActionPerformed(evt);
}
});
getContentPane().add(jButton21);
jButton21.setBounds(150, 140, 60, 25);
jButton22.setText("=");
jButton22.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton22ActionPerformed(evt);
}
});
getContentPane().add(jButton22);
jButton22.setBounds(220, 140, 60, 25);
pack();
}// /editor-fold//GEN-END:initComponents
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
show += "1";
text.setText(show);
}//GEN-LAST:event_jButton1ActionPerformed
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed
show += "2";
text.setText(show);
}//GEN-LAST:event_jButton2ActionPerformed
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed
show += "3";
text.setText(show);
}//GEN-LAST:event_jButton3ActionPerformed
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton4ActionPerformed
show += "4";
text.setText(show);
}//GEN-LAST:event_jButton4ActionPerformed
private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton5ActionPerformed
show += "5";
text.setText(show);
}//GEN-LAST:event_jButton5ActionPerformed
private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton6ActionPerformed
show += "6";
text.setText(show);
}//GEN-LAST:event_jButton6ActionPerformed
private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton7ActionPerformed
show += "7";
text.setText(show);
}//GEN-LAST:event_jButton7ActionPerformed
private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton8ActionPerformed
show += "8";
text.setText(show);
}//GEN-LAST:event_jButton8ActionPerformed
private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton9ActionPerformed
show += "9";
text.setText(show);
}//GEN-LAST:event_jButton9ActionPerformed
private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton10ActionPerformed
show += "0";
text.setText(show);
}//GEN-LAST:event_jButton10ActionPerformed
private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton13ActionPerformed
show += "*";
text.setText(show);
}//GEN-LAST:event_jButton13ActionPerformed
private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton14ActionPerformed
show += "/";
text.setText(show);
}//GEN-LAST:event_jButton14ActionPerformed
private void jButton21ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton21ActionPerformed
show = "";
text.setText("");
}//GEN-LAST:event_jButton21ActionPerformed
private void jButton22ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton22ActionPerformed
show += "=";
text.setText(show);
char str1[] = new char[50];
char str2[] = new char[50];
float result = 0;
str1 = show.toCharArray();
str2 = TranSmit(str1);
result = Count(str2);
text.setText("" + result);
show = "";
}//GEN-LAST:event_jButton22ActionPerformed
private void jButton12ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton12ActionPerformed
show += "-";
text.setText(show);
}//GEN-LAST:event_jButton12ActionPerformed
private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton11ActionPerformed
show += "+";
text.setText(show);
}//GEN-LAST:event_jButton11ActionPerformed
public static void main(String args[])
{
jisuanqi j = new jisuanqi();
j.setBounds(300, 300, 300, 195);
j.setVisible(true);
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton10;
private javax.swing.JButton jButton11;
private javax.swing.JButton jButton12;
private javax.swing.JButton jButton13;
private javax.swing.JButton jButton14;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton21;
private javax.swing.JButton jButton22;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JButton jButton7;
private javax.swing.JButton jButton8;
private javax.swing.JButton jButton9;
private javax.swing.JTextField text;
// End of variables declaration//GEN-END:variables
}
贪吃蛇游戏 望采纳
import java.awt.Button;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class Snake extends JFrame implements KeyListener{
int Count=0;
Button[][] grid = new Button[20][20];
ArrayListPoint snake_list=new ArrayListPoint();
Point bean=new Point(-1,-1);//保存随机豆子【坐标】
int Direction = 1; //方向标志 1:上 2:下 3:左 4:右
//构造方法
public Snake()
{
//窗体初始化
this.setBounds(400,300,390,395);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridLayout f=new GridLayout(20,20);
this.getContentPane().setBackground(Color.gray);
this.setLayout(f);
//初始化20*20个按钮
for(int i=0;i20;i++)
for(int j=0;j20;j++)
{
grid[i][j]=new Button();
this.add(grid[i][j]);
grid[i][j].setVisible(false);
grid[i][j].addKeyListener(this);
grid[i][j].setBackground(Color.blue);
}
//蛇体初始化
grid[10][10].setVisible(true);
grid[11][10].setVisible(true);
grid[12][10].setVisible(true);
grid[13][10].setVisible(true);
grid[14][10].setVisible(true);
//在动态数组中保存蛇体按钮坐标【行列】信息
snake_list.add(new Point(10,10));
snake_list.add(new Point(11,10));
snake_list.add(new Point(12,10));
snake_list.add(new Point(13,10));
snake_list.add(new Point(14,10));
this.rand_bean();
this.setTitle("总分：0");
this.setVisible(true);
}
//该方法随机一个豆子，且不在蛇体上，并使豆子可见
public void rand_bean(){
Random rd=new Random();
do{
bean.x=rd.nextInt(20);//行
bean.y=rd.nextInt(20);//列
}while(snake_list.contains(bean));
grid[bean.x][bean.y].setVisible(true);
grid[bean.x][bean.y].setBackground(Color.red);
}
//判断拟增蛇头是否与自身有碰撞
public boolean is_cross(Point p){
boolean Flag=false;
for(int i=0;isnake_list.size();i++){
if(p.equals(snake_list.get(i) )){
Flag=true;break;
}
}
return Flag;
}
//判断蛇即将前进位置是否有豆子，有返回true，无返回false
public boolean isHaveBean(){
boolean Flag=false;
int x=snake_list.get(0).x;
int y=snake_list.get(0).y;
Point p=null;
if(Direction==1)p=new Point(x-1,y);
if(Direction==2)p=new Point(x+1,y);
if(Direction==3)p=new Point(x,y-1);
if(Direction==4)p=new Point(x,y+1);
if(bean.equals(p))Flag=true;
return Flag;
}
//前进一格
public void snake_move(){
if(isHaveBean()==true){//////////////有豆子吃
Point p=new Point(bean.x,bean.y);//【很重要，保证吃掉的是豆子的复制对象】
snake_list.add(0,p); //吃豆子
grid[p.x][p.y].setBackground(Color.blue);
this.Count++;
this.setTitle("总分："+Count);
this.rand_bean(); //再产生一个豆子
}else{///////////////////无豆子吃
//取原蛇头坐标
int x=snake_list.get(0).x;
int y=snake_list.get(0).y;
//根据蛇头坐标推算出拟新增蛇头坐标
Point p=null;
if(Direction==1)p=new Point(x-1,y);//计算出向上的新坐标
if(Direction==2)p=new Point(x+1,y);//计算出向下的新坐标
if(Direction==3)p=new Point(x,y-1);//计算出向左的新坐标
if(Direction==4)p=new Point(x,y+1);//计算出向右的新坐标
//若拟新增蛇头碰壁，或缠绕则游戏结束
if(p.x0||p.x19|| p.y0||p.y19||is_cross(p)==true){
JOptionPane.showMessageDialog(null, "游戏结束！");
System.exit(0);
}
//向蛇体增加新的蛇头坐标,并使新蛇头可见
snake_list.add(0,p);
grid[p.x][p.y].setVisible(true);
//删除原蛇尾坐标，使蛇尾不可见
int x1=snake_list.get(snake_list.size()-1).x;
int y1=snake_list.get(snake_list.size()-1).y;
grid[x1][y1].setVisible(false);
snake_list.remove(snake_list.size()-1);
}
}
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_UP Direction!=2) Direction=1;
if(e.getKeyCode()==KeyEvent.VK_DOWN Direction!=1) Direction=2;
if(e.getKeyCode()==KeyEvent.VK_LEFT Direction!=4) Direction=3;
if(e.getKeyCode()==KeyEvent.VK_RIGHT Direction!=3) Direction=4;
}
@Override
public void keyReleased(KeyEvent e) { }
@Override
public void keyTyped(KeyEvent e) { }
public static void main(String[] args) throws InterruptedException {
Snake win=new Snake();
while(true){
win.snake_move();
Thread.sleep(300);
}
}
}
public class HelloWorld{
public static void main(String[] args){
System.out.println("hello world!");
}
}
一. 基本概念
Java是一种可以撰写跨平台应用软件的面向对象的程序设计语言。Java 技术具有卓越的通用性、高效性、平台移植性和安全性，广泛应用于PC、数据中心、游戏控制台、科学超级计算机、移动电话和互联网，同时拥有全球最大的开发者专业社群。
二. 体系
Java分为三个体系，分别为Java SE（J2SE，Java2 Platform Standard Edition，标准版），
JavaEE（J2EE，Java 2 Platform, Enterprise Edition，企业版）。
Java ME（J2ME，Java 2 Platform Micro Edition，微型版）。
//问题：求一个长方形的周长和面积
/*以面向过程的程序设计方式思考:
1.确定长方形的周长和面积的算法；
2.编写两个方法（函数）分别计算长方形的周长和面积;
3.求周长的方法（函数）和求面积的方法（函数）需要两个参数，
分别是长方形的长和宽*/
//面向过程的程序设计代码：
/*classRectangle
{
static
float
perimeter(float
length,floatwidth)
{
return
2*(length+width);
}
static
float
area(float
length,
float
width)
{
return
length*width;
}
public
static
void
main(String[]
args)
{
System.out.println("the
perimeter
is
="
+perimeter(3.123f,4.267f));
System.out.println("the
area
is="
+area(3.123f,4.267f));//使用f来表示浮点
}
}*/
/*以面向对象的程序设计方式思考：
1.一个长方形可以看成是一个长方形对象；
2.一个长方形对象有两个状态（长和宽）和两个行为(求周长和面积)
3.将所有长方形的共性抽取出来，设计一个长方形的类
4.通过长方形对象的行为，就可以求出某个具体的长方形的周长和面积*/
//面向对象的程序设计代码:
classRectangle
{
float
l,h;//有两个状态，即两个成员变量
float
perimeter()
{
return
2*(l+h);
}
float
area()
{
return
l*h;
}
public
static
void
main(String[]
args)
{
Rectangle
rect1=newRectangle();
Rectangle
rect2=newRectangle();
rect1.l=10.13f;
rect1.h=5.74f;
rect2.l=12.21f;
rect2.h=24.13f;
System.out.println("Theperimeter
is
="
+
rect1.perimeter());
System.out.println("The
area
is="
+
rect1.area());
System.out.println("Theperimeter
is
="
+
rect2.perimeter());
System.out.println("The
area
is="
+
rect2.area());
}
/*K:\Java\try\lesson3javacRectangle.java
K:\Java\try\lesson3java
Rectangle
The
perimeter
is
=31.74
The
area
is
=58.1462
The
perimeter
is
=72.68
The
area
is
=294.6273
*/
}