三好學(xué)生_小標標

 1     private final int[][] State_table;
 2     private int Now_state=0;
 3     private final int Char_m=0;//表示0-9的字符 49-48
 4     private final int Char_d=1;//表示.字符    45
 5     private final int Char_e=2;//表示e字符    69/101
 6     private final int Char_j=3;//表示-字符    46 
 7     //空格32
 8     
 9     private final int Int_result_code=1;//整型
10     private final int Float_result_code=3;//浮點型
11     private final int Scientif_result_code=6;//科學(xué)記數(shù)法
12     private final int Scientif_result_code_2=7;//科學(xué)記數(shù)法
13     // 0 2 4 5 狀態(tài)不可輸出

 1 FSM(){
 2     State_table=new int[8][4];
 3     int[] b={1,1,3,3,7,6,6,7};
 4     
 5     for(int i=0;i<8;i++)
 6     Arrays.fill(State_table[i],-1);//填滿
 7     State_table[1][1]=2;
 8     State_table[1][2]=4;
 9     State_table[3][2]=4;
10     State_table[4][3]=5;
11     for(int i=1;i<=8;i++)
12         State_table[i-1][0]=b[i-1];            
13     }

 1     //對輸入的字符串進行類型判斷
 2     public void Input_Classificantion(String Nowline){        
 3         for(int i=0;i<Nowline.length();i++) {            
 4             if(Nowline.charAt(i)>='0'&&Nowline.charAt(i)<='9')
 5                 Change_state(Now_state,Char_m );
 6             else if(Nowline.charAt(i)=='.')
 7                 Change_state(Now_state, Char_d);
 8             else if(Nowline.charAt(i)=='e'||Nowline.charAt(i)=='E')
 9                 {    Check_science(Nowline,i);
10                     Change_state(Now_state, Char_e);
11                 }
12             else if((Nowline.charAt(i)=='-'))
13                 Change_state(Now_state, Char_j);
14             else if(Nowline.charAt(i)==' ') {
15                 //排除同行的空格
16                     do {
17                         i=Nowline.indexOf(' ',i)+1;}
18                     while(Nowline.charAt(i)==' ');
19                     i--;
20                     Input();
21                 }
22             else 
23                 {System.out.println("輸入包含非法字符");
24                 Erroe_code=1;    }        
25         }
26         
27         Input();        
28     }

1     private boolean Output=false;//能否輸出標志
2     private boolean Check=false;//檢查科學(xué)計數(shù)法書寫是否規(guī)范
3     
4     private int Erroe_code=0;

 1     //通過讀取對應(yīng)數(shù)組的值來確定當前的狀態(tài)值
 2     private void Change_state(int Old_state,int Char_code) {
 3         Now_state=State_table[Old_state][Char_code];        
 4         
 5         if(Now_state==0||Now_state==2||Now_state==4||Now_state==5) //不可輸出狀態(tài)                                     
 6             Output=false;
 7         else if(Now_state==-1){
 8                 System.out.println("輸入錯誤");
 9                 Erroe_code=2;
10                 System.exit(1);
11             }
12         else //可輸出狀態(tài)
13             Output=true;
14         
15     }

 1     //根據(jù)對應(yīng)的當前狀態(tài)輸出該狀態(tài)的類型
 2     private  void Input() {
 3         if(Output==true) {
 4             if(Now_state==Int_result_code) 
 5                 System.out.println("整型");
 6             else if(Now_state==Float_result_code)
 7                 System.out.println("浮點型");
 8             else if(Check) {
 9                 if(Now_state==Scientif_result_code)
10                 System.out.println("科學(xué)計數(shù)法負");
11                 else if(Now_state==Scientif_result_code_2)
12                 System.out.println("科學(xué)計數(shù)法");
13             }
14             else 
15                 System.out.println("科學(xué)計數(shù)法格式錯誤");
16         }
17         else{
18             System.out.println("輸入錯誤");
19             Erroe_code=2;
20             System.exit(1);
21         }
22         Now_state=0;
23     }
24