產生的原因：java.util.NoSuchElementException

大家好我與下面的代碼代碼工作是做工精細下面的字符串 StringTokenizer st = new StringTokenizer("abc,koch, Ranchi, zalkhand, NY, 10001, India");產生的原因：java.util.NoSuchElementException

但是當我像=「ABC」串刪除元素它表明

Caused by: java.util.NoSuchElementException" exception.. 
StringTokenizer st = new StringTokenizer("koch, Ranchi, zalkhand, NY, 10001, India");

代碼：

package com.test; 


import java.util.StringTokenizer; 

import android.app.Activity; 
import android.os.Bundle; 

public class Test extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     StringTokenizer st = new StringTokenizer("koch, Ranchi, zalkhand, NY, 10001, India"); 
     System.out.println("Tokens are seperated"); 
     int i=0; 
     String address[] = new String[7]; 

     String contlocation=""; 
     String contfirst_street=""; 
     String contsecond_street=""; 
     String contcity=""; 
     String contstate=""; 
     String contzipcode=""; 
     String contcountry=""; 


     /* while(st.hasMoreTokens()) 
     { 

      */  
       for(i=0;i<7;i++) 
       { 
        address[i] = st.nextToken(","); 
        System.out.println("address "+i+": "+address[i]); 
       } 

       if(address.length==7) 
       { 

        System.out.println("\n-------------address.length==7--------------------"); 

        contlocation=address[0]; 
        System.out.println("contlocation :"+contlocation); 

        contfirst_street=address[1]; 
        System.out.println("contfirst_street :"+contfirst_street); 

        contsecond_street=address[2]; 
        System.out.println("contsecond_street :"+contsecond_street); 

        contcity=address[3]; 
        System.out.println("contcity :"+contcity); 

        contstate=address[4]; 
        System.out.println("contstate :"+contstate); 

        contzipcode=address[5]; 
        System.out.println("contzipcode :"+contzipcode); 

        contcountry=address[6]; 
        System.out.println("contcountry :"+contcountry); 

        System.out.println("\n-------------address.length==7--------------------"); 
       } 
       else if(address.length==6) 
       { 
        System.out.println("\n-------------address.length==6--------------------"); 

        contlocation=""; 
        System.out.println("contlocation :"+contlocation); 

        contfirst_street=address[0]; 
        System.out.println("contfirst_street :"+contfirst_street); 

        contsecond_street=address[1]; 
        System.out.println("contsecond_street :"+contsecond_street); 

        contcity=address[2]; 
        System.out.println("contcity :"+contcity); 

        contstate=address[3]; 
        System.out.println("contstate :"+contstate); 

        contzipcode=address[4]; 
        System.out.println("contzipcode :"+contzipcode); 

        contcountry=address[5]; 
        System.out.println("contcountry :"+contcountry); 

        System.out.println("\n-------------address.length==6--------------------"); 
       } 
       else if(address.length==5) 
       { 
        System.out.println("\n-------------address.length==5--------------------"); 

        contlocation=""; 
        System.out.println("contlocation :"+contlocation); 

        contfirst_street=address[0]; 
        System.out.println("contfirst_street :"+contfirst_street); 

        contsecond_street=""; 
        System.out.println("contsecond_street :"+contsecond_street); 

        contcity=address[1]; 
        System.out.println("contcity :"+contcity); 

        contstate=address[2]; 
        System.out.println("contstate :"+contstate); 

        contzipcode=address[3]; 
        System.out.println("contzipcode :"+contzipcode); 

        contcountry=address[4]; 
        System.out.println("contcountry :"+contcountry); 

        System.out.println("\n-------------address.length==5--------------------"); 
       } 

       else if(address.length==4) 
       { 
        System.out.println("\n-------------address.length==4--------------------"); 

        contlocation=""; 
        System.out.println("contlocation :"+contlocation); 

        contfirst_street=address[0]; 
        System.out.println("contfirst_street :"+contfirst_street); 

        contsecond_street=""; 
        System.out.println("contsecond_street :"+contsecond_street); 

        contcity=address[1]; 
        System.out.println("contcity :"+contcity); 

        contstate=address[2]; 
        System.out.println("contstate :"+contstate); 

        contzipcode=""; 
        System.out.println("contzipcode :"+contzipcode); 

        contcountry=address[3]; 
        System.out.println("contcountry :"+contcountry); 

        System.out.println("\n-------------address.length==4--------------------"); 
       } 

       else if(address.length==3) 
       { 
        System.out.println("\n-------------address.length==3--------------------"); 

        contlocation=""; 
        System.out.println("contlocation :"+contlocation); 

        contfirst_street=address[0]; 
        System.out.println("contfirst_street :"+contfirst_street); 

        contsecond_street=""; 
        System.out.println("contsecond_street :"+contsecond_street); 

        contcity=address[1]; 
        System.out.println("contcity :"+contcity); 

        contstate=""; 
        System.out.println("contstate :"+contstate); 

        contzipcode=""; 
        System.out.println("contzipcode :"+contzipcode); 

        contcountry=address[2]; 
        System.out.println("contcountry :"+contcountry); 

        System.out.println("\n-------------address.length==3--------------------"); 
       } 

         // System.out.println(st.nextToken("")); 
     //} 


    } 
    }

釷是是錯誤： -

> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794): FATAL 
> EXCEPTION: main 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794): 
> java.lang.RuntimeException: Unable to 
> start activity 
> ComponentInfo{com.test/com.test.Test}: 
> java.util.NoSuchElementException 06-23 
> 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.app.ActivityThread.access$2300(ActivityThread.java:125) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.os.Handler.dispatchMessage(Handler.java:99) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.os.Looper.loop(Looper.java:123) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.app.ActivityThread.main(ActivityThread.java:4627) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> java.lang.reflect.Method.invokeNative(Native 
> Method) 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> java.lang.reflect.Method.invoke(Method.java:521) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> dalvik.system.NativeStart.main(Native 
> Method) 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794): Caused by: 
> java.util.NoSuchElementException 06-23 
> 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> java.util.StringTokenizer.nextToken(StringTokenizer.java:272) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> java.util.StringTokenizer.nextToken(StringTokenizer.java:287) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> com.test.Test.onCreate(Test.java:34) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
> 06-23 11:12:59.931: 
> ERROR/AndroidRuntime(794):  at 
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

來源

2011-06-23 Prashant Kadam

使用StringTokenizer st = new StringTokenizer("koch, Ranchi, zalkhand, NY, 10001, India", ",");創建字符串標記器。我已經修改你的代碼，現在它的工作正常。

使用下面的代碼

import java.util.StringTokenizer; 

import android.app.Activity; 
import android.os.Bundle; 

    public class Test extends Activity { 
     /** Called when the activity is first created. */ 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.main); 


    StringTokenizer st = new StringTokenizer("koch, Ranchi, zalkhand, NY, 10001, India", ","); 
      int numberOfToken = st.countTokens(); 
      System.out.println("Tokens are seperated"); 
      int i=0; 
      String address[] = new String[numberOfToken]; 

      String contlocation=""; 
      String contfirst_street=""; 
      String contsecond_street=""; 
      String contcity=""; 
      String contstate=""; 
      String contzipcode=""; 
      String contcountry=""; 


      /* while(st.hasMoreTokens()) 
      { 

       */  

        for(i=0;i<numberOfToken;i++) 
        { 
         address[i] = st.nextToken(); 
         System.out.println("address "+i+": "+address[i]); 
        } 

        if(numberOfToken==7) 
        { 

         System.out.println("\n-------------address.length==7--------------------"); 

         contlocation=address[0]; 
         System.out.println("contlocation :"+contlocation); 

         contfirst_street=address[1]; 
         System.out.println("contfirst_street :"+contfirst_street); 

         contsecond_street=address[2]; 
         System.out.println("contsecond_street :"+contsecond_street); 

         contcity=address[3]; 
         System.out.println("contcity :"+contcity); 

         contstate=address[4]; 
         System.out.println("contstate :"+contstate); 

         contzipcode=address[5]; 
         System.out.println("contzipcode :"+contzipcode); 

         contcountry=address[6]; 
         System.out.println("contcountry :"+contcountry); 

         System.out.println("\n-------------address.length==7--------------------"); 
        } 
        else if(numberOfToken==6) 
        { 
         System.out.println("\n-------------address.length==6--------------------"); 

         contlocation=""; 
         System.out.println("contlocation :"+contlocation); 

         contfirst_street=address[0]; 
         System.out.println("contfirst_street :"+contfirst_street); 

         contsecond_street=address[1]; 
         System.out.println("contsecond_street :"+contsecond_street); 

         contcity=address[2]; 
         System.out.println("contcity :"+contcity); 

         contstate=address[3]; 
         System.out.println("contstate :"+contstate); 

         contzipcode=address[4]; 
         System.out.println("contzipcode :"+contzipcode); 

         contcountry=address[5]; 
         System.out.println("contcountry :"+contcountry); 

         System.out.println("\n-------------address.length==6--------------------"); 
        } 
        else if(numberOfToken==5) 
        { 
         System.out.println("\n-------------address.length==5--------------------"); 

         contlocation=""; 
         System.out.println("contlocation :"+contlocation); 

         contfirst_street=address[0]; 
         System.out.println("contfirst_street :"+contfirst_street); 

         contsecond_street=""; 
         System.out.println("contsecond_street :"+contsecond_street); 

         contcity=address[1]; 
         System.out.println("contcity :"+contcity); 

         contstate=address[2]; 
         System.out.println("contstate :"+contstate); 

         contzipcode=address[3]; 
         System.out.println("contzipcode :"+contzipcode); 

         contcountry=address[4]; 
         System.out.println("contcountry :"+contcountry); 

         System.out.println("\n-------------address.length==5--------------------"); 
        } 

        else if(numberOfToken==4) 
        { 
         System.out.println("\n-------------address.length==4--------------------"); 

         contlocation=""; 
         System.out.println("contlocation :"+contlocation); 

         contfirst_street=address[0]; 
         System.out.println("contfirst_street :"+contfirst_street); 

         contsecond_street=""; 
         System.out.println("contsecond_street :"+contsecond_street); 

         contcity=address[1]; 
         System.out.println("contcity :"+contcity); 

         contstate=address[2]; 
         System.out.println("contstate :"+contstate); 

         contzipcode=""; 
         System.out.println("contzipcode :"+contzipcode); 

         contcountry=address[3]; 
         System.out.println("contcountry :"+contcountry); 

         System.out.println("\n-------------address.length==4--------------------"); 
        } 

        else if(numberOfToken==3) 
        { 
         System.out.println("\n-------------address.length==3--------------------"); 

         contlocation=""; 
         System.out.println("contlocation :"+contlocation); 

         contfirst_street=address[0]; 
         System.out.println("contfirst_street :"+contfirst_street); 

         contsecond_street=""; 
         System.out.println("contsecond_street :"+contsecond_street); 

         contcity=address[1]; 
         System.out.println("contcity :"+contcity); 

         contstate=""; 
         System.out.println("contstate :"+contstate); 

         contzipcode=""; 
         System.out.println("contzipcode :"+contzipcode); 

         contcountry=address[2]; 
         System.out.println("contcountry :"+contcountry); 

         System.out.println("\n-------------address.length==3--------------------"); 
        } 
    } 
     }

來源

2011-06-23 11:55:11

非常感謝您......代碼的工作... –

我不知道你期待發生的事情：如果有六個令牌，你只能叫nextToken()六倍。這就是StringTokenizer的工作原理。您可以使用countTokens()來查看有多少令牌，或者您可以使用hasMoreTokens()來檢查對nextToken()的下一個呼叫是否會引發異常。

來源

2011-06-23 11:23:55

for循環中的語句執行7次，但StringTokenizer僅包含6個字符串。嘗試將for循環替換爲：

int i=0; 
while(st.hasMoreTokens()) { 
address[i] = st.nextToken(","); 
System.out.println("address "+i+": "+address[i]); 
i++; 
}

來源

2011-06-23 11:28:50 dragonfly

產生的原因：java.util.NoSuchElementException

回答

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