Java Applet implementation of UI, to solve the sudoku Puzzle.
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package my.sudoku; import java.awt.*; import java.awt.event.*; import java.applet.*; import java.util.Random; import javax.swing.*; import javax.swing.JOptionPane; /* <applet code="sudoku.class" width=500 height=400> </applet> */ public class Sudoku extends Applet implements ActionListener,TextListener { Random rand=new Random(); TextField [][]t=new TextField[10][10]; Button b,solve,ran,bk,initial,restart; int i,j,count=0; String txt[][]=new String[10][10]; int sel[][]=new int[281][281]; int s[][][]=new int[10][10][10]; int fnd[][]=new int[10][10]; int p[]=new int[10]; int dat; public void init() { setBackground(Color.cyan); Panel pan=new Panel(); Panel bod=new Panel(); pan.setLayout(new GridLayout(9,9)); bod.setLayout(new BorderLayout()); setFont(new Font("SansSerif",Font.BOLD,18)); ran=new Button("Solve"); restart=new Button("Restart"); for( i=1;i<=9;i++) for( j=1;j<=9;j++) { t[i][j]=new TextField(2); pan.add(t[i][j]); t[i][j].setText(""); t[i][j].addTextListener(this); t[i][j].setForeground(Color.red); t[i][j].setBackground(Color.green); } bod.add(ran,BorderLayout.EAST); bod.add(restart,BorderLayout.SOUTH); add(bod); add(pan); restart.addActionListener(this); ran.addActionListener(this); } public void textValueChanged(TextEvent te) { int yh; for(int te1=1;te1<=9;te1++) for(int te2=1;te2<=9;te2++){ if(te.getSource()==t[te1][te2]){ if(spellcheck(t[te1][te2].getText())==1) t[te1][te2].setText(""); singlecheck(te1,te2,t[te1][te2].getText()); } } } public void actionPerformed(ActionEvent e){ if(e.getSource()==restart){ for(int hj=1;hj<=9;hj++) for(int hj1=1;hj1<=9;hj1++){ txt[hj][hj1]=t[hj][hj1].getText(); } for(int hj=1;hj<=9;hj++) for(int hj1=1;hj1<=9;hj1++) { t[hj][hj1].setForeground(Color.red); fnd[hj][hj1]=10; t[hj][hj1].setText(""); } for(int hj=1;hj<=9;hj++) for(int hj1=1;hj1<=9;hj1++) for(int hj2=1;hj2<=9;hj2++) { s[hj][hj1][hj2]=0; } for(int hj=1;hj<=count;hj++) { sel[hj][0]=0;sel[hj][1]=0; sel[hj][2]=0;sel[hj][3]=0; } count=0; } if(e.getSource()==ran) { for(int hy1=1;hy1<=9;hy1++) for(int hy2=1;hy2<=9;hy2++) { txt[hy1][hy2]=t[hy1][hy2].getText(); } int cjk=0; mainexe(); Muru: { while(!finish()) { for(int hy1=1;hy1<=9;hy1++) for(int hy2=1;hy2<=9;hy2++) { t[hy1][hy2].setText(""+txt[hy1][hy2]); } mainexe(); cjk++; if(finish())break Muru; if(cjk>100) {msg bx=new msg(); break Muru;} } } } } public int[] getautocalculate(int i,int j) { int []auto=new int[10]; for(int h2=1;h2<=9;h2++) { if(s[i][h2][0]!=0 || s[h2][j][0]!=0) { auto[s[i][h2][0]]=s[i][h2][0]; auto[s[h2][j][0]]=s[h2][j][0]; } } int x1=0,y1=0; if(i<=3)x1=1;if(j<=3)y1=1; if(i>3 && i<=6)x1=4;if(j>3 && j<=6)y1=4; if(i>=7)x1=7;if(j>=7)y1=7; for(int i3=x1;i3<=x1+2;i3++) { for(int j3=y1;j3<=y1+2;j3++) { auto[s[i3][j3][0]]=s[i3][j3][0]; } } for(int h2=1;h2<=9;h2++) { if(auto[h2]==0) { auto[h2]=h2; } else auto[h2]=0; } return auto; } public int lengthofac(int k1,int k2) { int len=0; for(int u1=1;u1<=9;u1++) { if(s[k1][k2][u1]!=0)len++; } return len; } public boolean minimum(int c1,int c2) { for(int ctd1=1;ctd1<=9;ctd1++) { for(int ctd2=1;ctd2<=9;ctd2++) { if(s[ctd1][ctd2][0]==0) if((lengthofac(c1,c2))>(lengthofac(ctd1,ctd2))) {return false;} } } return true; } public int getrnumber(int k1,int k2) { int num=0,r; for(int u1=1;u1<=9;u1++) { if((s[k1][k2][u1]!=0) && (check(k1,k2,s[k1][k2][u1])==0)) { num= s[k1][k2][u1]; r=(int)(2*rand.nextDouble()); if(r==0)return num; //m[k1][k2]=1; } } return num; } public int singlecheck(int x,int y,String number) { if(!number.equals("")) { for(int k=1;k<=9;k++) if(k!=x) if((t[k][y].getText()).equals(number)) { t[x][y].setText(""); t[x][y].setForeground(Color.red); return 1; } for(int k=1;k<=9;k++) if(k!=y) if((t[x][k].getText()).equals(number)) {t[x][y].setText(""); return 1; } int x1=0,y1=0; if(x<=3)x1=1;if(y<=3)y1=1; if(x>3 && x<=6)x1=4;if(y>3 && y<=6)y1=4; if(x>=7)x1=7;if(y>=7)y1=7; for(int i3=x1;i3<=x1+2;i3++) { for(int j3=y1;j3<=y1+2;j3++) { if((i3!=x) && (j3!=y)) if((t[i3][j3].getText()).equals(number)) { t[x][y].setText(""); return 1; } } } } return 0; } public int spellcheck(String s) { if(s.equals("1") ||s.equals("2")) return 0; else if(s.equals("3") ||s.equals("4") ||s.equals("6")) return 0; else if(s.equals("5") ||s.equals("7") ||s.equals("8") ||s.equals("9")) return 0; else return 1; } public int check(int x,int y,int number) { //Check X area for(int k=1;k<x;k++) if(s[k][y][0]==number) return 1; //Check Y area for(int k=1;k<y;k++) if(s[x][k][0]==number) return 1; //Check Box Area int x1=0,y1=0; if(x<=3)x1=1;if(y<=3)y1=1; if(x>3 && x<=6)x1=4;if(y>3 && y<=6)y1=4; if(x>=7)x1=7;if(y>=7)y1=7; for(int i3=x1;i3<=x1+2;i3++) { for(int j3=y1;j3<=y1+2;j3++) { if(s[i3][j3][0]==number)return 1; } } return 0; } public boolean NeedForSpeed() { int xc=1; for(int nfs=1;nfs<=9;nfs++) for(int nfs1=1;nfs1<=9;nfs1++) { if(fnd[nfs][nfs1]==0) { fnd[nfs][ nfs1]=10; return true; } } return false; } public void BackTrack() { for(int gc=1;gc<count;gc++) { fnd[sel[gc][1]][sel[gc][2]]=10; sel[gc][0]=0;sel[gc][1]=0;sel[gc][2]=0; } count=0; } public void autocalculate() { for(int w=0;w<=9;w++) for(int x=0;x<=9;x++) { s[w][x][0]=0; for(int z=0;z<=9;z++) { s[w][x][z]=0; } } for(i=1;i<=9;i++) { for(j=1;j<=9;j++) { if(fnd[i][j]!=10) { s[i][j][0]=fnd[i][j]; } else { s[i][j][0]=0; } } } for(int i1=1;i1<=9;i1++) { for(int j1=1;j1<=9;j1++) { if(s[i1][j1][0]==0) { p=getautocalculate(i1,j1); for(int i2=1;i2<=9;i2++) { s[i1][j1][i2]=p[i2]; } } } } } public void randomfn() { muruga: { for(int zx=1;zx<=9;zx++) { for(int zy=1;zy<=9;zy++) { autocalculate(); if(minimum(zx,zy)==true) if(s[zx][zy][0]==0) { dat=getrnumber(zx,zy); fnd[zx][zy]=dat; t[zx][zy].setForeground(Color.blue); if(dat!=0) { sel[count][0]=1; sel[count][1]=zx; sel[count][2]=zy; sel[count][3]=dat; count++; } break muruga; } } } } if(NeedForSpeed()){BackTrack();} } public boolean finish() { for(int hd1=1;hd1<=9;hd1++) for(int hd2=1;hd2<=9;hd2++) if(fnd[hd1][hd2]==10) return false; return true; } public void mainexe() { int cd=0; for(int hj=1;hj<=9;hj++) for(int hj1=1;hj1<=9;hj1++) { if(!(t[hj][hj1].getText()).equals("")) fnd[hj][hj1]=Integer.parseInt(t[hj][hj1].getText()); else fnd[hj][hj1]=10; } Lord: { while(!finish()) { randomfn(); cd++; if(cd>600){break Lord;} } } for(int te1=1;te1<=9;te1++) for(int te2=1;te2<=9;te2++) t[te1][te2].setText(""+fnd[te1][te2]); } } class msg extends JDialog { msg() { JOptionPane pane=new JOptionPane("sudoku BY D.Karthick"); pane.setForeground(Color.red); pane.showMessageDialog(this,"Not Able To Find"); } } |