几个月之前写的，没有太好的注释也不是太完善，就这样吧
现在大一快结束了，以后也想做游戏呢
加油
//----------------------------------------
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class King1 extends JFrame {
private Container container;
JTextField field[];
int array[][];
int arr[];
boolean flag[];
int len;
public King1() {
super("King");
setLayout(null);
container=getContentPane();
field=new JTextField[16];
arr=new int[16];
array=new int[4][4];
flag=new boolean[16];
len=16;
for(int i=0;i<16;i++)arr[i]=i;
int x = 50;
int y = 50;
for(int i = 0;i<field.length;i++)
{
field[i] = new JTextField();
field[i].setBounds(x, y, 70, 70);
field[i].setEditable(false);
field[i].setHorizontalAlignment(JTextField.CENTER);
field[i].setFont(new Font("宋体",Font.BOLD,40));
if((i+1)%4==0){x=50;y+=71;}
else{x+=71;}
container.add(field[i]);
}
add();add();
addWindowFocusListener(new WindowFocusListener() {
public void windowGainedFocus(WindowEvent e) {
System.out.println("窗口获得了焦点！");
setFocusable(true);
}
public void windowLostFocus(WindowEvent e) {
System.out.println("窗口失去了焦点！");
}
});
addKeyListener(new KeyAdapter() {
public void keyReleased(KeyEvent e) {
super.keyPressed(e);
if(e.getKeyCode() ==KeyEvent.VK_UP){up();}
else if(e.getKeyCode()==KeyEvent.VK_DOWN){down();}
else if(e.getKeyCode()==KeyEvent.VK_LEFT){left();}
else if(e.getKeyCode()==KeyEvent.VK_RIGHT){right();}
}
});
setBounds(500,200,400,400);
setVisible(true);
setFocusable(true);
}
public static void main(String[] args) {
King1 king=new King1();
king.setDefaultCloseOperation(3);
}
void up(){
boolean flag1=false;
for(int i=0;i<3;i++){
for(int j=0;j<4;j++){
int num=i+1;
if(array[i][j]==0){
while(num<4&&array[num][j]==0){num++;}
if(num<4){move(i,j,num,j);flag1=true;}
}
num=i+1;
if(array[i][j]!=0){
while(num<4&&array[num][j]==0){num++;}
if(num<4&&array[i][j]==array[num][j]){change(i,j,num,j);flag1=true;}}
}
}
if(flag1){add();}
}
void down(){
boolean flag1=false;
for(int i=3;i>0;i--){
for(int j=0;j<4;j++){
int num=i-1;
if(array[i][j]==0){
while(num>=0&&array[num][j]==0){num--;}
if(num>=0){move(i,j,num,j);flag1=true;}
}
num=i-1;
if(array[i][j]!=0){
while(num>=0&&array[num][j]==0){num--;}
if(num>=0&&array[i][j]==array[num][j]){change(i,j,num,j);flag1=true;}}
}
}
if(flag1){add();}
}
void left(){
boolean flag1=false;
for(int j=0;j<3;j++){
for(int i=0;i<4;i++){
int num=j+1;
if(array[i][j]==0){
while(num<4&&array[i][num]==0){num++;}
if(num<4){move(i,j,i,num);flag1=true;}
}
num=j+1;
if(array[i][j]!=0){
while(num<4&&array[i][num]==0){num++;}
if(num<4&&array[i][j]==array[i][num]){change(i,j,i,num);flag1=true;}
}
}
}
if(flag1){add();}
}
void right(){
boolean flag1=false;
for(int j=3;j>0;j--){
for(int i=0;i<4;i++){
int num=j-1;
if(array[i][j]==0){
while(num>=0&&array[i][num]==0){num--;}
if(num>=0){move(i,j,i,num);flag1=true;}
}
num=j-1;
if(array[i][j]!=0){
while(num>=0&&array[i][num]==0){num--;}
if(num>=0&&array[i][j]==array[i][num]){change(i,j,i,num);flag1=true;}
}
}
}
if(flag1){add();}
}
void move(int x1,int y1,int x2, int y2){
array[x1][y1]=array[x2][y2];
array[x2][y2]=0;
flag[x2*4+y2]=false;
flag[x1*4+y1]=true;
}
void change(int x1,int y1 ,int x2,int y2){
array[x1][y1]*=2;
array[x2][y2]=0;
flag[x2*4+y2]=false;
len++;
}
void add(){
int num=(int) (Math.random()*len);
int prob=(int) (Math.random()*10);
int j=0;
for(int i=0;i<16;i++){if(!flag[i]){arr[j++]=i;}}
int aa=arr[num];
array[aa/4][aa%4]=prob>=7?4:2;
field[aa].setText(array[aa/4][aa%4]+"");
len--;
flag[aa]=true;
update();
if(len==0)judge();
}
void update(){
for(int i=0;i<16;i++){if(array[i/4][i%4]!=0)field[i].setText(""+array[i/4][i%4]);
else {field[i].setText("");}
}
}
void temp(int x,int y){arr[x]^=arr[y];arr[y]^=arr[x];arr[x]^=arr[y];}
void judge(){
boolean flag=true;
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
if(array[i][j]==array[i][j+1]||array[i][j]==array[i+1][j]){flag=false;break;}
}
}
for(int i=0;i<3;i++)if(array[i][3]==array[i+1][3]||
array[3][i]==array[3][i+1]){flag=false;break;}
if(flag){JOptionPane.showMessageDialog(this, "你输了");
for(int i=0;i<16;i++){array[i/4][i%4]=0;len=16;this.flag[i]=false;}
update();
add();add();
}
}
}