根據昨天J48算法得到了這樣一顆決策樹：
afternoon <=9
| mltsk <= 6
| | morning <= 6
| | | night <= 4
| | | | mltsk <= 5: 2.0 (340.0)
| | | | mltsk > 5
| | | | | night <= 1: 2.0 (18.0)
| | | | | night > 1: 1.0 (3.0)
| | | night > 4
| | | | morning <= 4
| | | | | night <= 12: 2.0 (24.0/1.0)
| | | | | night > 12: 3.0 (8.0/1.0)
| | | | morning > 4
| | | | | afternoon <= 5: 2.0 (3.0/1.0)
| | | | | afternoon > 5: 3.0 (7.0)
| | morning > 6
| | | afternoon <= 5
| | | | morning <= 12: 2.0 (6.0)
| | | | morning > 12: 3.0 (2.0)
| | | afternoon > 5
| | | | morning <= 7
| | | | | afternoon <= 7: 2.0 (3.0/1.0)
| | | | | afternoon > 7: 3.0 (6.0/1.0)
| | | | morning > 7: 3.0 (30.0)
| mltsk > 6
| | morning <= 7: 1.0 (370.0/1.0)
| | morning > 7
| | | night <= 1: 1.0 (8.0)
| | | night > 1: 3.0 (4.0/1.0)
afternoon > 9
| afternoon <= 21
| | morning <= 18
| | | mltsk <= 5
| | | | afternoon <= 11
| | | | | morning <= 6
| | | | | | night <= 5
| | | | | | | morning <= 3: 2.0 (4.0)
| | | | | | | morning > 3
| | | | | | | | night <= 1: 2.0 (4.0/1.0)
| | | | | | | | night > 1: 3.0 (9.0)
| | | | | | night > 5: 3.0 (12.0)
| | | | | morning > 6: 3.0 (38.0)
| | | | afternoon > 11: 3.0 (145.0)
| | | mltsk > 5
| | | | afternoon <= 13
| | | | | morning <= 4
| | | | | | morning <= 2: 1.0 (7.0)
| | | | | | morning > 2
| | | | | | | night <= 4: 1.0 (6.0/1.0)
| | | | | | | night > 4: 3.0 (2.0)
| | | | | morning > 4
| | | | | | mltsk <= 22: 3.0 (22.0/2.0)
| | | | | | mltsk > 22: 1.0 (3.0)
| | | | afternoon > 13: 3.0 (39.0)
| | morning > 18
| | | afternoon <= 17: 3.0 (23.0)
| | | afternoon > 17
| | | | night <= 14
| | | | | morning <= 22: 3.0 (7.0)
| | | | | morning > 22: 4.0 (6.0/1.0)
| | | | night > 14: 4.0 (13.0)
| afternoon > 21
| | morning <= 14
| | | afternoon <= 26: 3.0(27.0/1.0)
| | | afternoon > 26
| | | | night <= 13
| | | | | tj102 <= 1
| | | | | | afternoon <= 32: 3.0 (6.0)
| | | | | | afternoon > 32: 4.0 (2.0)
| | | | | tj102 > 1: 4.0 (2.0)
| | | | night > 13: 4.0 (16.0)
| | morning > 14
| | | afternoon <= 24
| | | | night <= 10
| | | | | morning <= 24: 3.0 (10.0)
| | | | | morning > 24: 4.0 (5.0)
| | | | night > 10: 4.0 (44.0/1.0)
| | | afternoon > 24
| | | | night <= 5
| | | | | morning <= 18: 3.0 (4.0/1.0)
| | | | | morning > 18: 4.0 (20.0)
| | | | night > 5: 4.0 (292.0)
下面是根據決策樹寫的if-else語句：public String divideRules(String dltsk,String mltsk,String tj102,
String else2,String morning,String afternoon,String night){
String belongs = "";
if(Integer.parseInt(afternoon) <= 9){
if(Integer.parseInt(mltsk)<= 6){
if(Integer.parseInt(morning) <= 6){
if(Integer.parseInt(night) <= 4){
if(Integer.parseInt(mltsk)<= 5){
belongs = "2.0";
}else{
if(Integer.parseInt(night) <= 1){
belongs = "2.0";
}else{
belongs = "1.0";
}
}
}else{
if(Integer.parseInt(morning)<=4){
if(Integer.parseInt(night) <= 12){
belongs = "2.0";
}else{
belongs = "3.0";
}
}else{
if(Integer.parseInt(afternoon) <= 5){
belongs = "2.0";
}else{
belongs = "3.0";
}
}
}
}else{
if(Integer.parseInt(afternoon)<=5){
if(Integer.parseInt(morning)<=12){
belongs = "2.0";
}else{
belongs = "3.0";
}
}else{
if(Integer.parseInt(morning) <=7){
if(Integer.parseInt(afternoon)<=7){
belongs = "2.0";
}else{
belongs = "3.0";
}
}else{
belongs = "3.0";
}
}
}
}else{
if(Integer.parseInt(morning)<=7){
belongs = "1.0";
}else{
if(Integer.parseInt(night)<=1){
belongs = "1.0";
}else{
belongs = "3.0";
}
}
}
}else{
if(Integer.parseInt(afternoon)<=21){
if(Integer.parseInt(morning)<=18){
if(Integer.parseInt(mltsk)<=5){
if(Integer.parseInt(afternoon)<=11){
if(Integer.parseInt(morning)<=6){
if(Integer.parseInt(night) <=5){
if(Integer.parseInt(morning)<=3){
belongs = "2.0";
}else{
if(Integer.parseInt(night)<=1){
belongs = "2.0";
}else{
belongs = "3.0";
}
}
}else{
belongs = "3.0";
}
}else{
belongs = "3.0";
}
}else{
belongs = "3.0";
}
}else{
if(Integer.parseInt(afternoon)<=13){
if(Integer.parseInt(morning)<=4){
if(Integer.parseInt(morning)<=2){
belongs = "1.0";
}else{
if(Integer.parseInt(night)<=4){
belongs = "1.0";
}else{
belongs = "3.0";
}
}
}else{
if(Integer.parseInt(mltsk)<=22){
belongs = "3.0";
}else{
belongs = "1.0";
}
}
}else{
belongs = "3.0";
}
}
}else{
if(Integer.parseInt(afternoon)<=17){
belongs = "3.0";
}else{
if(Integer.parseInt(night)<=14){
if(Integer.parseInt(morning)<=22){
belongs = "3.0";
}else{
belongs = "4.0";
}
}else{
belongs = "4.0";
}
}
}
}else{
if(Integer.parseInt(morning)<=14){
if(Integer.parseInt(afternoon)<=26){
belongs = "3.0";
}else{
if(Integer.parseInt(night)<=13){
if(Integer.parseInt(tj102)<=1){
if(Integer.parseInt(afternoon)<=32){
belongs = "3.0";
}else{
belongs = "4.0";
}
}else{
belongs = "4.0";
}
}else{
belongs = "4.0";
}
}
}else{
if(Integer.parseInt(afternoon)<=24){
if(Integer.parseInt(night)<=10){
if(Integer.parseInt(morning)<=24){
belongs = "3.0";
}else{
belongs = "4.0";
}
}else{
belongs = "4.0";
}
}else{
if(Integer.parseInt(night)<=5){
if(Integer.parseInt(morning)<=18){
belongs = "3.0";
}else{
belongs = "4.0";
}
}else{
belongs = "4.0";
}
}
}
}
}
return belongs;
}