OnJava8-Examples/generics/ArrayOfGeneric.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// generics/ArrayOfGeneric.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

public class ArrayOfGeneric {

static final int SIZE = 100;

static Generic<Integer>[] gia;

@SuppressWarnings("unchecked")

public static void main(String[] args) {

try {

gia = (Generic<Integer>[])new Object[SIZE];

} catch(ClassCastException e) {

System.out.println(e.getMessage());

}

// Runtime type is the raw (erased) type:

gia = (Generic<Integer>[])new Generic[SIZE];

System.out.println(gia.getClass().getSimpleName());

gia[0] = new Generic<>();

//- gia[1] = new Object(); // Compile-time error

// Discovers type mismatch at compile time:

//- gia[2] = new Generic<Double>();

}

/* Output:

[Ljava.lang.Object; cannot be cast to [LGeneric;

Generic[]