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null pointer exception

 
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No error when compile it,
But it does not execute!!!
What is the solution???
 
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Initializing_Array[] ia = new Initializing_Array[10];



You have created 10 reference of type Initializing_Array
It doesnt mean 10 objects of Initializing_Array.

So you have to create Object and assign to these refence, then only you able to set the values.

like

 
Consider Paul's rocket mass heater.
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