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Editorial Team
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Asked: 2026-06-02T19:33:29+00:00

i need to sort array item and store old index in new array so

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i need to sort array item and store old index in new array so i have try treemap and collection for that, i got complete output in collection as per my expectation but problem raise when i convert collection to array. 

float[] array = new float[10];
        array[0] = 11;
        array[1] = 10;
        array[2] = 3;
        array[3] = 40;
        array[4] = 5;
        array[5] = 60;
        array[6] = 4;
        array[7] = 41; 
        array[8] = 110;
        array[9] = 8;         

        Map<Float, Integer> map = new TreeMap<Float, Integer>();
        for (int i = 0; i < array.length; ++i) {
            map.put(array[i], i);
        }
        Collection<Integer> indices = map.values();
        System.out.println("indices"+indices);
        String s[] = (String[])indices.toArray(new String[0]);
        for (int i = 0, n = s.length; i < n; i++)
         {
              System.out.println(s[i]);
         }

It raise error like:

04-18 14:55:13.380: ERROR/AndroidRuntime(859): FATAL EXCEPTION: main
04-18 14:55:13.380: ERROR/AndroidRuntime(859): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jcord/com.jcord.Jcord_for_Con_lat_long_to_east_nothenActivity}: java.lang.ArrayStoreException
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.os.Looper.loop(Looper.java:123)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.app.ActivityThread.main(ActivityThread.java:4627)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at java.lang.reflect.Method.invokeNative(Native Method)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at java.lang.reflect.Method.invoke(Method.java:521)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at dalvik.system.NativeStart.main(Native Method)
04-18 14:55:13.380: ERROR/AndroidRuntime(859): Caused by: java.lang.ArrayStoreException
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at java.util.AbstractCollection.toArray(AbstractCollection.java:357)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at com.jcord.Jcord_for_Con_lat_long_to_east_nothenActivity.onCreate(Jcord_for_Con_lat_long_to_east_nothenActivity.java:50)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
04-18 14:55:13.380: ERROR/AndroidRuntime(859):     ... 11 more
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1 Answer

  1. Editorial Team

    Replace

        String s[] = (String[])indices.toArray(new String[0]);

    with

        Integer s[] = (Integer[])indices.toArray(new Integer[0]);
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