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Editorial Team
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Asked: 2026-06-17T23:01:08+00:00

any reason for there to be a problem for using get and set of

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any reason for there to be a problem for using get and set of the ArrayList collections class like this, I am getting runtime errors

want to put the Prize object at y position in one ArrayList “oneList” to the y postion of another ArrayList called “rungame“

 ArrayList<Prize> xrt = new ArrayList<Prize>();
 ArrayList<Prize> rungame = new ArrayList<Prize>();

 for(int y = 0; y < xrt.size(); y++){

  rungame.set(y, xrt.get(y));

 }

Logcat output:

01-29 16:16:42.450: E/AndroidRuntime(2644): FATAL EXCEPTION: main
01-29 16:16:42.450: E/AndroidRuntime(2644): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
01-29 16:16:42.450: E/AndroidRuntime(2644):     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at java.util.ArrayList.set(ArrayList.java:477)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at lottery.MainLottery.onClick(MainLottery.java:231)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at android.view.View.performClick(View.java:3511)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at android.view.View$PerformClick.run(View.java:14110)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at android.os.Handler.handleCallback(Handler.java:605)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at android.os.Looper.loop(Looper.java:137)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at android.app.ActivityThread.main(ActivityThread.java:4424)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at java.lang.reflect.Method.invokeNative(Native Method)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at java.lang.reflect.Method.invoke(Method.java:511)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-29 16:16:42.450: E/AndroidRuntime(2644):     at dalvik.system.NativeStart.main(Native Method)
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1 Answer

  1. Editorial Team

    The Problem is with rungame.set(); method you are accessing an empty ArrayList and setting the data in the specified index which it wont has.

    means in first iteration rungame has 0 element and you are trying to set Prize object in 0th index which it wont have.

    try to use rungame.add(xrt.get(y)); and refer the JavaDoc

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